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System Level RF Transceiver Chip NRF24E1 and Its Application in Wireless Keyboard

NRF24E1 transceiver is a system level RF chip launched by Nordic VLSI. Advanced 0.18 M CMOS process, 6 6mm 36 pin QFN package, based on nRF2401 RF chip structure, integrates RF, 8051mcu, 9-input 10 bit ADC, 125 channel, UART, SPI, PWM, RTC and WDT into a single chip, with internal voltage regulator (working voltage 1.9 3.6V, recommended working voltage 3.3V) and VDD voltage monitoring, and the channel switching time is less than 200 s. The data rate is 1Mbps, the maximum RF output decibel is 0dB, and external saw (sound meter) is not required Filter. NRF24E1 is the first and universal low-cost RF system level chip with a transceiver band of 2.4GHz. It is suitable for wireless keyboard and mouse, wireless handheld terminal, wireless frequency identification, digital video, remote control, automotive electronics and other short-range wireless high-speed applications. 1   Introduction to nRF24E1 1.1 microprocessor the instruction system of nRF24E1 microprocessor is compatible with the instruction system of industry standard 8051, but their instruction execution time is slightly different. Generally, the execution time of each instruction of nRF24E1 is 4 20 clock cycles, while that of industry standard 8051 is 12 48 clock cycles. NRF24E1 increases ADC, SPI and R compared with industry standard 8051 Five interrupt sources are f receiver 1, RF receiver 2 and wake-up timer; three timers are the same as 8052. NRF24E1 contains one UART which is the same as 8051. Under the traditional asynchronous communication mode, timer 1 and timer 2 can be used as UART (serial port) In order to facilitate data transfer with the external RAM area, the CPU of nRF24E1 also integrates two data pointers, and the clock of its microcontroller directly comes from the crystal oscillator. The functional module diagram of nRF24E1 is shown in Figure 1.

System Level RF Transceiver Chip NRF24E1 and Its Application in Wireless Keyboard 1

There are 256b data RAM and 512b ROM in the microprocessor. After power on reset or software reset, the processor automatically executes the code in the boot area of the ROM. the user program is usually loaded from E2PROM into a 4KB RAM (the ram can also be used to store data) under the guidance of the boot area. If the mask ROM (i.e. the included ROM) is not used in the application , the program code must be loaded from the external nonvolatile memory. It is common to extend E2PROM through SPI interface, and the model is recommended to be 25320. Compared with the standard 8051, the microcontroller of nRF24E1 adds some new functions, so some special function registers are added accordingly to control these new functions. The new special function registers are rad IO (P2), adccon, adcdatah, adcdatal, adcstatic, pwmcon, pwmduty, etc. in the microcontroller of nRF24E1, the registers of P0 and P1 ports are also different from those of standard 8051, and other special function registers are the same as those of standard 8051. 1.2 PWM and SPI interface nRF24E1 has a programmable PWM output.

During use, dio9 (i.e. p0.7) can be changed by program It can be programmed to determine that PWM works in 6-bit, 7-bit or 8-bit. The three ports of SPI are reused with GPIO (din0, dio0 and dio1) and RF transceiver. SPI hardware does not generate any chip selection signal. Generally, GPIO bit (P0 port) is used As the chip selection port of external SPI equipment. 1.3 RTC wake-up timer, WTD and RC oscillator. There is a low-power RC oscillator in nRF24E1, which can work continuously when VDD 1.8V, independent of the application. RTC wake-up timer and WTD (watchdog) It is two 16 bit programmable timers whose working clock is lp_osc of RC oscillator.

The timing time of wake-up timer and watchdog is about 300 S 80ms, and the default value is 10ms. 1.4 the A / D converter nRF24E1 has 9 channels of 10 bit ADC, and the linear conversion time is 48 CPU instruction cycles per 10 bits. The 9 inputs of the A / D converter can be selected by software. Channels 0 7 can convert the voltage values on the corresponding pins ain0 ain7 into digital values, and channel 8 is used to monitor the working voltage of nRF24E1. The A / D converter works at 10 bits by default Mode, which can work in 6-bit, 8-bit or 12 bit mode through software. 1.5 wireless transceiver nRF24E1 transceiver communicates with other modules through internal parallel port or internal SPI port, and its function is the same as that of single-chip RF transceiver nRF2401. The data standby signal output by duoreceiver receiver can be turned into microprocessor interrupt signal through program or transmitted to CP through GPIO port U. NRF2401 operates in the global open 2.4G 2.5GHz frequency band. The transceiver consists of a complete frequency synthesizer, a power amplifier, a regulator and two receivers. The output power, channel and other RF parameters can be controlled by programming the special function register radio (0xa0). In the transmitting mode, the RF current consumption is only 10.5ma and in the receiving mode, 18ma (energy saving can be achieved by program controlling the on / off of the transceiver). 2   Basic knowledge of wireless keyboard wireless keyboard uses wireless mode to communicate between keyboard and PC. the wireless module is generally realized by RF technology or Bluetooth technology.

Due to the complex protocol, high cost and long development cycle of Bluetooth technology, many wireless keyboards use RF technology to realize wireless connection. In the field of RF, Nordic VLSI company of Norway The performance of our RF chips is very outstanding. Our products mainly include nRF401 series, nRF903 series, nRF2401 series and nRF24E1 series. This paper introduces the design method of using nRF24E1 to realize wireless keyboard.

System Level RF Transceiver Chip NRF24E1 and Its Application in Wireless Keyboard 2

Most wireless keyboards are powered by batteries, so many energy-saving technologies are needed. For energy-saving purposes, many wireless keyboards do not use "num lock", "caps lock" and "scroll lock" on wired keyboards These three LED indicators. In addition, the wireless keyboard should reasonably and effectively use the RF module. The RF data packet from the keyboard to the PC may contain up to 8 keystrokes. The keyboard scanning matrix is scanned about 500 times per second. Generally, no more than 1 keystroke is detected in each scanning cycle. Because people can't feel the detection delay of 150ms, when the keyboard detects 1 keystroke and sends After sending the RF data packet to the PC, it can be idle for more than 150ms until the next key is pressed, which can minimize the working time of the RF module [2] 3. For the keyboard that only needs to send data, the use of nrf24e2 can meet the needs of the general keyboard. If the keyboard is required to not only send information, but also receive feedback from the PC, nRF24E1 needs to be used as the wireless module in the keyboard. Two way transceiver is more conducive to ciphering, packet retransmission and energy saving when the system is turned off. 3   The application of nRF24E1 in wireless keyboard 3.1 keyboard scanning matrix the interface mode between nRF24E1 and wireless keyboard is shown in Figure 2. The common PC keyboard has 104 keys, while the keyboard matrix shown in Figure 2 has 8 rows and 20 columns, and up to 160 key switches can be defined. During the design process, some keys can not be defined. Each key is arranged at the intersection of rows and columns. When the key is pressed In order to scan the keyboard matrix, nRF24E1 sends the column scanning signal to the shift register in sequence. The column scanning signal consists of 1 "0" and 19 "1" and "0" Move backward bit by bit in the shift register, and the status of the keyboard row is scanned once for each move. If a key in this column is pressed, the row value corresponding to the key is "0" and others are "1".

In the process of keyboard scanning, the key may shake, so the problem of de jitter should be considered when writing software. Common de jitter methods: once the system detects that a key is pressed, it will delay 30 50ms before detecting the key. If the detected key state is still pressed, the key will be treated as pressed once. 3.2 system software NRF24E1 has 4KB on-chip RAM, which is enough for keyboard software. After the system is powered on, the program in E2PROM will be automatically downloaded to the 4KB ram, and MCU can directly read and write the code in RAM. The functions of keyboard software: (1) provide column scanning information required by shift register. (2) read travel scanning value. (3) Detect that the key is pressed and de jittered. (4) send the scanned information of the pressed key to the PC. (5) Energy saving state cycle. The wireless keyboard should use energy-saving technology to prolong the battery life. The ShockBurst TM technology of nRF2401 on nRF24E1 chip is designed to save energy for users, so designers can not consider energy saving when writing software. However, designers should consider how to further reduce the current when the system is idle. When the crystal oscillator of nRF2401 is 16mhz, its The working current of the on-chip 8051 core is 3mA. Because the keyboard works periodically, the idle time of the keyboard is very long compared with the working time. Therefore, when the keyboard does not work, it is necessary to set the on-chip 8051 to the idle state, and the working current of the on-chip 8051 in the idle state is only 2 A. This is used to reduce battery consumption. The tasks of the system in idle state and working state are as follows. Idle state: (1) complete all keyboard scanning (about 0.5ms). (2) enter the working state if a key is pressed. (3) set 8051 to idle state and the wake-up time of RTC to 20ms. (4) Idle state cycle. Working state: (1) scan the keyboard 500 times per second. (2) send all key information to the PC. (3) enter the idle state if no key is pressed within 10 seconds. (4) Working state cycle. Generally speaking, considering battery energy conservation according to the above methods can increase the service life of the battery by about 40 times. Therefore, it is very important to consider battery energy conservation in the design of system software. 4   junction   Practice has proved that nRF24E1 is very suitable for realizing the communication between wireless keyboard and PC. its advantages: (1) nRF24E1 is embedded with 8051, which is easier to reduce the volume. (2) ShockBurst TM technology is adopted to make programming more convenient. (3) it is easier to realize safe keyboard information transmission. (4) the 2.4GHz transceiver frequency band is a global open frequency band (5) Battery monitoring is more convenient and low power consumption. (6) the GPIO of nRF24E1 makes it easier to expand other functions, such as LED indication.

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Why Does My Wireless Keyboard and Mouse Only Work Some of the Time?
Why Does My Wireless Keyboard and Mouse Only Work Some of the Time?
Why does my wireless keyboard and mouse only work some of the time?Try moving the receiver so it has line of sight with the keyboard and mouse!------who thought of arranging the characters in the keyboard?I read an article about that, why are they placed like they are? When they started making key boards it was a manual type writer. If you punch two keys close together they got stuck. Which took time to get them apart. So by decipering the words so that it rarely happened this key board was established. Once everyone knew this to be the keyboard it had to stay the same. Changeing as we have seen can cause a huge diaster. ON a adding machine the 123 on the numerical keyboard is at the top. with the 789 on the bottom. People who were constantly adding things and did it at record time was use to that keyboard. When computers came along someone not knowing that made a computer with the 123 on the bottom. It was a diaster, some people just could not get it straight and it caused untold suffering and problems to business men. So when they mentioned it would be easier to put letters in a different spot. It caused an outrage! So the idea was scrapped. So we have what we have today.------Why does my music stop if I use keyboard sounds?Maybe you should specify your question. What is this u2018musicu2019; playing on your PC/tablet/phone/Youtube/straming/u2026.? What is this u2018use keyboard soundsu2019; is it your computer keyboard, the keyboard on your screen, a musical keyboard, on screen, on your desk, a MIDI-keyboard? Are we talking phone, PC, tablet, something else? Is there more than a keyboard involved, like a guitar, headphones? Do you use cables? Bluetooth? What is the situation this problem occurs in?Why does my music stop if I use keyboard sounds?------are keyboard and piono the same thing? do they have any differences?Yes, of course keyboards are smaller than pianos. Keyboards are electronic, because they are plugged in. But a major thing to note is that though the range of a piano is much larger because it has more keys (usually it can go higher and lower than a keyboard), the keyboard can give you different tones. Usually you can press a few buttons and voila, your keyboarding can sound like a church choir. Press a few more buttons, and you get a drum. My old keyboard from the late 90s even has fireworks, so any new keyboard should probably have cooler tones. Another major difference is that in most cases, a keyboard's keys are not as hard to play as a piano. With a piano, the strike of a key makes a hammer hit a string on the inside, which makes the sound. On a keyboard, one touch of the key simply registers an electronic pitch stored into the "computer" of the keyboard. I started piano on a keyboard, then graduated to an upright piano. For beginners, it is usually more cost-effective to buy a $50-$100 keyboard that can easily be donated or thrown away if the student chooses not to continue than to purchase a $10,000 beautiful baby grand piano that would be heart-wrenching to get rid of. If you plan on learning to play the piano, I recommend that you start with a keyboard first so you do not end up wasting precious money if you do not continue. Other than that, the keys are the same, and people do not have a problem transitioning from keyboard to piano or vice versa, aside from the weight of the keys. Good luck!------Dvorak keyboard layoutDvorak /dvrk/ (listen) is a keyboard layout for English patented in 1936 by August Dvorak and his brother-in-law, William Dealey as a faster and more ergonomic alternative to the QWERTY layout (the de facto standard keyboard layout). Dvorak proponents claim that it requires less finger motion and as a result reduces errors, increases typing speed, reduces repetitive strain injuries, or is simply more comfortable than QWERTY. Although Dvorak has failed to replace QWERTY, most major modern operating systems (such as Windows, macOS, Linux, Android, Chrome OS, and BSD) allow a user to switch to the Dvorak layout. iOS does not provide a system-wide, touchscreen Dvorak keyboard, although third-party software is capable of adding the layout to iOS, and the layout can be chosen for use with any hardware keyboard, regardless of printed layout. Several modifications were designed by the team directed by Dvorak or by ANSI. These variations have been collectively or individually termed the Dvorak Simplified Keyboard, the American Simplified Keyboard or simply the Simplified Keyboard, but they all have come to be known commonly as the Dvorak keyboard or Dvorak layout.
Wireless Keyboard Or Usb Keyboard?
Wireless Keyboard Or Usb Keyboard?
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Wireless Keyboard Question?
Wireless Keyboard Question?
Wireless Keyboard Question?I do not actually think there is a keyboard that uses a power cord, let alone a wireless one. If you have a cable running from the wall to the keyboard it would not really be wireless anymore since you need a wire to use it. However, there are some good alternatives such as Logitech Wireless Solar Keyboard K750. runs on only solar power. there's also the SMK-Link VP6510 VersaPoint Wireless and alot of other that run on rechargeable batteries so you could recharge the keyboard at night while your sleeping and then use it again the next morning.------German keyboard layoutThe German keyboard layout is a QWERTZ keyboard layout commonly used in Austria and Germany. It is based on one defined in a former edition (October 1988) of the German standard DIN 2137-2. The current edition DIN 2137-1:2012-06 standardizes it as the first (basic) one of three layouts, calling it "T1" (Tastaturbelegung 1, "keyboard layout 1"). The German layout differs from the English (US and UK) layouts in four major ways: The positions of the "Z" and "Y" keys are switched. In English, the letter "y" is very common and the letter "z" is relatively rare, whereas in German the letter "z" is very common and the letter "y" is very uncommon. The German layout places "z" in a position where it can be struck by the index finger, rather than by the weaker little finger. Part of the keyboard is adapted to include umlauted vowels (, , ) and the sharp s (). (Some newer types of German keyboards offer the fixed assignment AltH for its capitalized version.) Some of special key inscriptions are changed to a graphical symbol (e.g. Caps Lock is an upward arrow, Backspace a leftward arrow). Most of the other abbreviations are replaced by German abbreviations (thus e.g. "Ctrl" is translated to its German equivalent "Strg", for Steuerung). "Esc" remains as such. (See: "Key labels" below) Like many other non-American keyboards, German keyboards change the right Alt key into an Alt Gr key to access a third level of key assignments. This is necessary because the umlauts and some other special characters leave no room to have all the special symbols of ASCII, needed by programmers among others, available on the first or second (shifted) levels without unduly increasing the size of the keyboard.------Keyboard must be unplugged and replugged in after startup?Oddly enough, in Windows 7, even when unable to find device drivers for the keyboard HP SK-2025, the issue was still there.I upgraded to Windows 10, after I was able to log in for the first time I never had the issue again. Perhaps Windows 10 had automatically found a driver for it somehow?.------Thumb keyboardA thumb keyboard, or a thumb board, is a type of keyboard commonly found on PDAs, mobile phones, and PDA phones which has a familiar layout to an ordinary keyboard, such as QWERTY. The inputting surface is usually relatively small, and is intended for typing using the available thumbs, while holding the device------Can I put heavy keyboard on the macbook pro?The weight of the keyboard is one thing. I have seen students put a stack of textbooks on top of their MacBook laptops without any damage. I can not tell you what the weight was nor do I want to embark on a testing procedure to find out what its weight tolerance is.However, what I have found is that it's not so much the weight, but the activity that impacts the MacBook. I have seen MacBook laptops used as everything from a cafeteria tray to a seat cushion to even a mirror for putting on makeup. These machines were returned to our depot for repair because of what they was done to them, not what was placed on them.In your case, you want to use this as a keyboard stand for a mechanical keyboard (gaming perhaps?) so you will be "pounding" on this keyboard for any length of time. The (rethorical) question is - is this worth it? Is a damaged top case worth this activity? I can tell you that these assemblies (keyboard, case, track pad, etc.) are not covered under Apple warranty when damaged and it's quite expensive to repair. I would find another solution
Why Does My Wireless Keyboard Stop Working Sometimes?
Why Does My Wireless Keyboard Stop Working Sometimes?
Why does my wireless keyboard stop working sometimes?If you have something blocking the wireless signal - check your desktop and see if a coffee cup or a speaker or something else is blocking the wireless connector to the computer - I AM SERIOUS! This is probably your problem. You have to have a clear signal path from the keyboard and mouse to the receiver thing that is connected to the computer------Is it possible to use Apple Wireless keyboard with Android 4.2.2 tablet?If you are sure the keyboard is properly paired, have you tried using the excellent External Keyboard Helper Pro? I use it with a Microsoft Bluetooth keyboard, and it handles both switching to the external keyboard from the internal one (and back) when needed, but also little chores like nuking the caps lock key------How do I open the context menu from a Mac keyboard?I always have the same question but I did not find the answer yet.In Windows, when we use the keyboard short-cuts we mostly use the Menu key in Windows keyboard:When this Menu key is pressed, Windows will assume that you right-clicked the highlighted/active element > then it will show you the context menu even if the mouse pointer is not pointing to the highlighted element.So this feature seems to be missing in Mac OS. And whatever suggested solutions, even Enable Mouse Key it always require you to point/move your mouse pointer to element first, which is meaningless. If I need to use the keyboard short-cut to open the context menu on the highlighted item, why do I need again to move the mouse pointer to it also. Somehow this is not a short-cut!!------I need help with my keyboard?I also have a toshiba satellite. I've never had to take the keyboard off but I know exactly what you are talking about. If you bought insurance the best thing for you to do is to take it in and tell them the space bar came off and they should fix it pretty quick. In the future when you are cleaning out your key board use a electronics duster air compressed can. They work wonders on getting crumbs and dust out of tiny spots.------How do I clean the buttons my on my keyboard?Turn off the computer, or unplug the keyboard, and pop the keys out of the keyboard in the area that needs to be cleaned. Slightly dampen a rag, q-tip, or cotton ball with water and wipe the keys and the area around where the keys were. If there is -any- water left on the keyboard, wait for it to evaporate (or wipe it up) completely before placing back on the keys and plugging it back in. Optionally, you can use alcohol, as it will evaporate much faster than water, and clean it even better. You can even pour a small drop of this under any keys you can not pop out, as long as you wait for it to evaporate completely before plugging back in the keyboard. If you unsure whether it is gone or not, spray the area with a can of compressed air to blow any of the remaining liquid out. Also, if you have an expensive keyboard, check with your instruction manual to see if it is safe to use alcohol or not, and what to clean it with. I know some keyboards (such as the Logitech G11 or G15) use a special coating on their backlit keys that can become damaged by use of alcohol when cleaning the keyboard.------Replacing an Alienware M14x keyboard?yes it is ok to put in the back connectors . I have dell XPS and i changed my keyboard the same way. The way back connectors of the keyboard and track pad are connected , is same in almost all the laptop brands . The only thing u need to take care is that u do not push it too hard. Just gently slide the connector back in its place , slide it till it slides and if it stops , then do not push too much . then secure the lock which holds the connector on its place .------Sharing keyboard and mouse between two boxesI used a KVM switch in this setup, just do not use the monitor plug on the switch. Leave the monitors directly connected to the computers and use the KVM switch for the keyboard and mouse only. Plug both the keyboard and mouse into a small USB splitter and you will only need one switch.
Recreating a Missing Wireless Keyboard Dongle with NRF24L01
Recreating a Missing Wireless Keyboard Dongle with NRF24L01
Recreating a missing wireless keyboard dongle with NRF24L01If your girl friend is that tied to the keyboard buy another wireless and replace the transmitter from one with the transmitter from the other. This will be much simpler than the hardware reconstruction of the dongle.just my 2 cents!------Keyboard drivers and fontsThe Keyboard driver for this encoding scheme are available in Tamil Virtual University website for free. It uses Tamil99 and Tamil Typewriter keyboard layouts, which are approved by Tamil Nadu Government, and maps the input keystrokes to its corresponding characters of TACE16 scheme. To read the files which are created using TACE16 scheme, the corresponding Unicode Tamil fonts for this encoding scheme are also available in the same website. These fonts not only has mapping of glyphs for characters of TACE16 format, but also has mapping of glyphs for the present Unicode encoding for both ASCII and Tamil characters, so that it can provide backward compatibility for reading existing files which are created using present Unicode encoding scheme for Tamil language------I need some Keyboard help.?First thing I would do is make an attempt to get an exchange/refund without the receipt. A lot of times employees at the store may have knowledge of this issue, or you might get pleasantly surprised with a refund or exchange without the receipt. There could be number of issues so without getting technical take these steps... 1. Be sure you have plugged in the pedal before you turn on the power. Disconnect the pedal from your keyboard. Power the keyboard off. Make sure the pedal is NOT depressed and plug it back into the keyboard. Power the keyboard on and see if the pedal is working properly. If it is still not working properly.... 2, Power your keyboard off, disconnect the pedal and see if you can find a polarity switch on the pedal (maybe on the bottom or next to the foot control). Remember the current polarity setting (so that you can set it back to its' original setting if needed). Simply flip the polarity switch, connect the pedal to your keyboard power up your keyboard and see if that worked. If it is still not working properly.... 3. If you are mechanically inclined, power your keyboard off, disconnect the pedal and reset the polarity switch to its' original setting. Open the pedal and look for two wires running from the board to the switch. You want to reverse the wiring connection of those two wires on the board. Hopefully, once you get the pedal open and look inside It will be clear what you need to do. If it is still not working properly.... 4. Reconnect the wiring to its' original position, take a deep breath and resign yourself to the fact that you are out 70 bucks...------There's a problem with my computer's keyboard. Help?If the connectors are the round ones, (PS/2) make sure you've got the right one in the right place. They should be color coded green for the mouse and purple for the keyboard. Whether they are PS/2 or USB, shutdown the computer completely, and reboot. That should do the trick.------How to get my keyboard cleaned?First, shutdown your PC and remove the mains plug, unplug the keyboard (remember which socket) and hold it upside down to release any debris from inbetween the keys (pressing the keys is a good way to release it). If you have a can of compressed air then use it to blow any debris from around and under the keys, if not then use the hose of a vacuum cleaner to remove it. Now take one of the cotton buds and put a couple of drops of the cleaning fluid on it, use the cotton bud to clean the sides of the keys. After cleaning the sides of the keys take your lint free cloth and dampen it with your cleaning fluid (do not put the liquid directly on the keyboard), give the surface of the keyboard a good wipe over using the cloth to trace the contours of the keys.------why will the keys on my keyboard not work correctly?Sometimes you will just need to remove it from the port and put it back in. Also try restarting your computer. If it is just some keys the keyboard may just be back or you can try removing the keys to see if there is something that is blocking the key from being used. Sometimes my keyboard does that I just have to restart my computer. Hope that helps you out. -Christopher-
Do you know the benefits and features of round keycaps?
Do you know the benefits and features of round keycaps?
You must have found this secret: beautiful things are always difficult to let people refuse, beautiful faces will let people see a few more eyes, beautiful scenery let people linger, beautiful language makes people like spring breeze... No matter how much society advances and how human nature changes, positive and good things will never go out of date. Sales experience in the past, we found that the game keyboard diversification and high quality by a lot of gamers, manufacturers are more willing to develop high unit price game keyboard or mechanical keyboard, this kind of product give a person the feeling is hale, mechanical, sense of science and technology, but the keyboard as a computer around, more time is used to work, editing, input, calculation is also its ultimate mission. Our time in the office is about 6-8 hours a day, the office area is your exclusive battlefield, here you work day to solve a variety of work problems day after day, achieved all kinds of excellent results, accompany you the most every day must have your keyboard. This issue of our theme is: "let you become beautiful supporting role", the keyboard as one of the three desktop swordsmen, it is not only practical, good-looking appearance will give you a bright window for a day's work, a good mood will let you get twice the result with half the effort, let you become beautiful from the inside to the outside can be a small office accessories. The five keyboards launched this time have one thing in common- -the round key cap, the key problem of the card no longer exists, the round key cap and the radian of the fingers perfectly fit, and the "ergonomics" is perfectly reflected in this series. Engineering new design press the keyboard, in line with the human body design, Comfortable operation feel more extreme. Appearance level control preferred KY-K871 and K872, do not need too complex, a simple area keyboard, double color or multi-color key cap gives her senior aesthetic feeling (support all black), beautiful appearance includes all the keyboard function, support 2.4G and BT double mode, with switch button, but a key mute, K872 more than the former a groove, can place small office accessories. KY-K871 2.4G + BT dual modes: 2.4G/ B1/ B2 KY-K872 Yichip1026 BT3.0+5.0+2.4G In order to extract the advantages of small keyboard, the rest four with shelves, respectively for tablet / phone / pen, etc., make full use of it, can save space and search time, K870 keyboard has been introduced in the first few months, some customers have ordered, it is removable battery, is a cost-effective keyboard. Bluetooth 3.0+5.0 keyboard Compact design Full set Circular keycap Suitable for keeping the mobile phone and tablet on With Multimedia function FN+ESC: Lock the screen FN+DEL: Prtsc Working with 2* AAA Battery In contrast, the K873 added the volume knob to make the design feel stronger, the knob switch is a decompression tool, making the function more specific, it is a 2-zone keyboard, like the K874, a separate number keyboard is a favorite of accountants and sellers. KY-K873 Suitable for keeping the mobile phone and tablet on KY-K874 2.4G + BT 3.0 + BT 5.0 triple modes: 2.4G/ BT1/ BT2 The above five keyboards, but also have a very big advantage: silent switch. Office environment, the noise can let a person is very sensitive, especially by annoying problems, plagued by complex numbers, calm down is the beginning to solve the problem, soft typing experience will relieve you for 6-8 hours of fatigue. This series is very suitable for all office staff and students, if there are relevant quotation, pictures and sample requirements, please contact keyceo sales staff.
How to Choose High-quality  Dual Wired and Wireless Keyboard
How to Choose High-quality Dual Wired and Wireless Keyboard
Introduction to dual wired and wireless keyboardI will show you how to use the basic functionality of the double wired and wireless keyboard. The main idea of the tutorial is to explain how to use the basic functionality of the double wired and wireless keyboard. It is important to understand that there are two keyboards, one is wired and the other is wireless. The two keyboards are connected by wires. It is possible to connect two keyboards using a pair of wire.Some of the issues that people have when using keyboards are as follows: I have problems with not being able to use the mouse. I don't know how to fix it. The problem is that the keypad doesn't work well with the mouse. It is also hard to set up and get used to. So, I am trying to learn how to use the mouse so that I can use the keyboard.The reason why people think that using two keyboards is good is because it makes the computer easier to use. When you use two keyboards, it makes the computer easier to use. It makes the computer easier to use. The reason why people think that using two keyboards is good is because it makes the computer easier to use. When you use two keyboards, it makes the computer easier to use. It makes the computer easier to use. The reason why people think that using two keyboards is good is because it makes the computer easier to use. When you use two keyboards, it makes the computer easier to use.An introduction to dual wired and wireless keyboard.When you have been told that your computer has been shut down, it is quite natural to start thinking about how to restart it. This article will provide you with some tips on how to do that. When you have been told that your computer has been shut down, it is quite natural to start thinking about how to restart it. This article will provide you with some tips on how to do that.First impression and using experience of dual wired and wireless keyboardPeople have different types of keyboards. Some people use two or more keyboards, some people use only one. And some people have both keyboards. People have different types of keyboards. Some people use two or more keyboards, some people use only one.If you have the time, it is possible to do this by doing it yourself. Just follow these steps: 1. Using the 2 in your left hand, write down the first two letters of the word that you are about to type. 2. Now, use your right hand to move the letter to the next position in the text. 3. Then, use your left hand to move the letter to the next position in the text. 4. Finally, use your right hand to move the letter to the next position in the text. 5.Using experience of dual wired and wireless keyboard is easy. If you have some experience of using two wired keyboards then you can use it to create a great user experience. It is not easy to create a great user experience if you don't know how to use the keyboard well. This article will show you how to create a great user experience by using two wired and wireless keyboards.As soon as you open the case, you'll notice that it's got two batteries. I use my laptop to type on my computer and then when I'm finished with the computer, I'll put it in my pocket. The battery will last about 3 hours, so you can take it out and keep it for yourself. And if you don't have any other things to do, just leave it in your pocket.I don't think I need to explain how much you are looking for an answer to this question. The first impression is that you are going to have to make some basic adjustments to your writing. If you need to learn how to write more efficiently, it is best to use a specialized software program that will help you with this. It is better to be able to do it than to be stuck in a corner doing it yourself.Pros and cons of dual wired and wireless keyboardNo, it is not true that there are only two types of keyboards: one type that has keys on both sides and another type that has keys on only one side.It is not always easy to put up with bad writing. It is hard to write bad things about someone you don't know. You can do it, but if you are doing it in a negative way, you will feel that you are doing it wrong. It is better to be able to put up with it than to feel that you are doing it wrong.It is hard to put into words what I have in mind when I write this. It is not easy to put into words what I have in mind when I write this. It is not easy to put into words what I have in mind when I write this. It is not easy to put into words what I have in mind when I write this. It is not easy to put into words what I have in mind when I write this.Infinite capacity for energy efficiency is good for your health. When you use a laptop or an iPod, it is not so easy to waste your battery. You need to charge your laptop or iPod before you start using it. If you use a laptop or an iPod, you need to recharge your battery before you start using it. The battery can be recharged by charging it in the morning before you go to work. This will help you to get back to your work faster.Incorporating LED downlighting into your lighting system will increase the life of your fixtures and light up your home. You can now control your lights with just a pair of light bulbs. There are so many different types of LED downlighting that you can choose from. There are also some very high quality products that you can buy from Amazon that are going to make your home look much more appealing. The next thing that you need to do is get rid of your old light fixtures and replace them with new ones. These lights will come in handy when you have children or pets in your home.Overall evaluation of dual wired and wireless keyboardMost of the time people think of keyboards as simple devices that are connected to a computer. However, in reality, keyboards are much more complex than that. In order to have the best possible experience with your computer, you need to be able to interact with it in a way that allows you to work efficiently. This means that your computer needs to be capable of supporting many different functions. In order to do that, it needs to be equipped with some kind of memory. A memory is a piece of software that is installed on your computer that allows you to store information about your computer.If you have an account on forum.wired.com, please register to continue reading. If you are a member of forum.wired.com, please login to continue reading.It is important to have good knowledge of how to use the computer. It is important to know how to use the computer. It is important to know how to use the computer. It is important to know how to use the computer. It is important to know how to use the computer. It is important to know how to use the computer. It is important to know how to use the computer.There are so many things that I would like to say about this, but it is just not possible to put it all in one sentence. In order to make it easier to read, I will try to keep it short and simple. It is a pretty easy task to do. The main problem with using wireless keyboards is that they don't offer as many features as the wired keyboards. So if you want to use them, you have to buy a new set of keys.With Dual-Wireless Keyboard, it is possible to be able to type in two different directions. Dual-Wireless Keyboard can be used to type in two different directions, such as: Left-Right and Right-Left. The keypad of the dual-wireless keyboard is equipped with four LEDs that indicate the direction of the keys.
What's the best selling Mechancial keyboard in 2022
What's the best selling Mechancial keyboard in 2022
"No matter you are a programmer, or a programmer's girlfriend, whether you are an enthusiast or a game boss, the following 2 mechanical keyboards will definitely make you love it. The new work of 2022, a typical case of dual-mode mechanical keyboard and single-mode dual-system keyboard, aluminum alloy case brings you a new sense of texture and working atmosphere." At this point in time, as a seasoned game seller,here are the specs you need to :   KY-MK92 KY-MK101 keybaord typy: 2.4G wireless&wired dual mode Wired mode with dual system SWitch: Conventional OUTEMU mechanical axis CONTENT mechanical Low profile axis keycaps: Conventional high key caps Low profile kay caps Top cover: Aluminilum Aluminilum Anti-ghosting Full keys Full keys Switch working life: OUTEMU 50 million times 50 million time Key number: 87/88keys Double injection keycaps 87/88keys Double injection keycaps Key stroke: 2.0±0.6mm 2.0±0.6mm Product interface: Type-C to USB2.0 Type-C to USB2.0 Cable: 1.6M braided cable with magnet ring 1.6M braided cable with magnet ring, Working voltage: 3.7~5V 3.7~5V Working current: 120~650mA 150mA Battery : Rechargeable Li-ion Battery 1900mAh No battery Size: (L) 359 x (W)141 x (H) 37.2±0.3mm (L) 345 x (W)125 x (H) 25±0.3mm Weight: 950±5g 650±5g Master carton: 10PCS/CTN 10PCS/CTN "The first is kY-MK92, a mechanical keyboard with a high key cap, which supports wired and wireless versions, TKL versions and versions with number keys Black/white/colors is available" 80% key surface volume, two keyboard layouts to meet the selection needs of different people. The aluminum alloy shell shows the temperament of the big brand, and the oxidized metal color supports the sense of atmosphere and advanced sense of the game. An incomparable game keyboard inseparable from the game software, according to their own preferences to customize the keyboard lighting/functions/multimedia and so on, macro recording function to bring custom Settings, can let you sit in the game always win the general throne. Conventional use of Outemu 50 million times of mechanical shaft, feel comfortable, high flexibility, long service life" Moreandmoreenthusiastsliketocustomizetheplugandpullaxisbody,whichcannotonlymeetthepleasureofDIY,butalsoreducemaintenancecosts.Anewaxisbodyequalsanewexperience.The price of PCBA of plug and pull axis is different from that of welding axis, please consult relevant personnel in detail Six steps to replace the plug and pull axis "KY-MK101 has a very different echo and supports both Windows and Mac single-mode mechanical keyboards, It is worth mentioning that its low profile axis and Ultra-thin key cap, office and game can harvest different experience" "To compare the layout of the keycaps between Windows and Mac, Mac systems have their own symbol and layout, using this keyboard can be interchangeably two different systems via combo buttons of ""FN+TAB""" Use the CONTENT low profile axis, and the ultra-thin key cap "The lower profile axis is precisely a product of the mechanization of laptop keyboards, which are thinner and lighter than the average mechanical keyboard, The reason for this is the height of the shaft has been shortened by about 35%, and the overall formation has been reduced from 4mm to 3.2mm, so the bounce time is shorter, the trigger is faster, and it's easier to carry around, making it ideal for laptops." The thickness of the ultra-thin key cap is about 3MM, which reduces wrist fatigue and makes less noise "The top cover belongs to the coated aluminum alloy frosted surface, eliminating reflection and reducing handprints. The back is the whole smooth ABS shell, and the light black highlights details and quality. Add two electroplated foot frame and silica gel foot pad, reveal the grade of the whole keyboard from inside and outside" "Of course, the KY-MK101 also comes with keyboard software with custom and macro recording, FN+ multimedia function keys, and 15 backlights, all of which can be customized through the software" The above is just a comparison of the two keyboards' notable features. Please contact us for more HD pictures or details, as well as samples. Trust me, the real keyboards will be amazing to you!!!
A Brief Overview on the Best Wireless Keyboard and Mouse for Home Office
A Brief Overview on the Best Wireless Keyboard and Mouse for Home Office
Introduction to best wireless keyboard and mouse for home officeYou can use wireless keyboard and mouse to control your computer with high quality. If you are looking for the best wireless keyboard and mouse for home office, then go to www.microsoft.com. You can use wireless keyboard and mouse to control your computer with high quality. If you are looking for the best wireless keyboard and mouse for home office, then go to www.microsoft.com. You can use wireless keyboard and mouse to control your computer with high quality. If you are looking for the best wireless keyboard and mouse for home office, then go to www.microsoft.com.Just because someone says that it is not possible to use an iPhone 7 does not mean that it is not possible to use an iPhone 7. You can always learn how to use an iPhone 7. This means that you can always learn how to use an iPhone 7. The only problem is that the device does not have a function for editing or working on documents or files. If you want to learn how to use an iPhone 7, you need to learn how to use an iPhone 7.Most of the people who use keyboards and mice do not know that they are made of metal. If you have an electric keyboard and mouse, then you will know that they are very sturdy and long lasting. They will not break easily. So when you use your keyboard and mouse, then you will not need to take care of them in a lot of time. And if you use them regularly, then they will last longer. But if you use them frequently, then you will need to take care of them more.Most of the time people are lazy and not very skilled in writing. So they often resort to using bad or non-standard keyboards and mice. It is better to use good keyboards and mice that will make your typing more comfortable and easier. A good keyboard and mouse will also help you make better notes and keep you from getting distracted by other things.Features of best wireless keyboard and mouse for home officeYou need to be logged in to see this text. If you are not a member of Techzone then sign up here. For full access to Techzone's features please click here.It is hard to give an accurate definition of what constitutes a good wireless keyboard and mouse for home office. It is important to understand that many people will have their own preferences about what they need. Some people will use a wireless keyboard and mouse to work from home, while others will use a PC or Mac to work from home. There are also some people who will use a PC or Mac to work from home and still others will use a laptop or tablet to work from home. People who work from home may also use laptops or tablets to work from home.Most people don't think about their desks as being anything special. But they are something special. And it is really easy to get your desks clean and tidy. If you have an old desk, you can get rid of it and make it look new again. You can use your desks as little offices, small study rooms, even little houses. And there are many different ways to do it. It is really easy to do.You need to use wireless keyboard and mouse to control your computer. The keyboard and mouse have been designed to work in conjunction with the computer. If you are looking for a good wireless keyboard and mouse, then it is important to make sure that you use the right one. There are many different types of wireless keyboards and mice available today. It is important to choose the right one for your needs. You can find many different brands of wireless keyboards and mice available today. They all have their own advantages and disadvantages.Applications of best wireless keyboard and mouse for home officeFor your information, there are some applications that you can use to help you write better. For example, some applications that you can use to help you write better are Microsoft Word, Excel, PowerPoint, Access, OpenOffice, Zofin, Publisher, LibreOffice, It's easy to use these applications to help you write better. In addition, some applications that you can use to help you write better are Adafruit and Makefy. So, it's important to learn how to use these applications to help you write better.It is easy to understand that it is not always easy to find the best wireless keyboard and mouse for home office. If you need to use a wireless keyboard and mouse, it is important to know how to use them properly. A wireless keyboard and mouse will be more comfortable for you if you are using it in a comfortable environment. In order to make your life easier, you should know how to use them properly.If you need to know what is the difference between an air conditioner and a washing machine, then you need to know that an air conditioner is a device that cools the air in a house. In fact, it is an electric appliance that has been around for many years. So if you need to know what is the difference between an air conditioner and a washing machine, then you need to know that an air conditioner is a device that cools the air in a house. In fact, it is an electric appliance that has been around for many years.Application of best wireless keyboard and mouse for home office high quality is one of the most important aspects of good work. For people who work in an office, they need to be able to use their laptops and desktops at the same time. A good laptop will make your life easier. If you are looking for a laptop that will make your life easier, then you should go for a high quality laptop. High quality laptops are much more expensive than cheap laptops. It is also much more expensive to get a good laptop than a cheap laptop. The price of a good laptop will depend on the hardware that you choose.Benefits of best wireless keyboard and mouse for home officeWe can get more done in less time by using the right way of doing things. The smart phone is a great tool for taking care of your work. It is much easier to use than a pen and paper. A good smartphone will make you more productive and save you from unnecessary distractions. You can even use it to write or take a screenshot.With many keyboards and mice available today, people have been using them for years. A good laptop has an integrated keyboard and mouse, so that you can use it to access the internet and work in a professional way. If you are a freelancer, then you will need to use a computer with a high-end monitor to view your work and be able to make it faster. For example, if you are working on a freelance basis, then you will need to use a high-end monitor that has the most screen resolution possible.In the event that you have any questions or comments about the information in this blog, feel free to send them to me at achenc@huawei.com. The purpose of this blog is to provide people with reliable information about various aspects of their everyday lives. We believe that information should be accessible to everyone and we will make sure that it is easy to find and understand.There are so many different kinds of wireless keyboards and mice that it is impossible to know which one to choose. It is important to pick the one that is most comfortable for you. You can find several good quality wireless keyboards and mice on the market today. If you are looking for the best wireless keyboard and mouse for home office, then you should consider these four types of wireless keyboards and mice that are currently available.
What You Need to Know About Best Wireless Keyboard and Mouse for Office
What You Need to Know About Best Wireless Keyboard and Mouse for Office
The introduction of best wireless keyboard and mouse for officeInvention of best wireless keyboard and mouse for office is an invention that was invented by some people who were looking for a way to get more done in their office. The invention was created by some people who were looking for a way to get more done in their office. It was created by some people who were looking for a way to get more done in their office. Invention of best wireless keyboard and mouse for office is an invention that was invented by some people who were looking for a way to get more done in their office.With some technology improvements, it is easier to get back to work from home. People who have no choice but to use their laptop or computer will be able to do so without having to spend a lot of time in the office. It is easy to make yourself productive at home, especially if you have access to the Internet. There are many apps that will allow you to do all of your work from home.Inventions that make people work more efficiently. It is an important part of any business that helps people to get their work done faster. The use of computers has made it easier for people to get their work done faster. If you want to be more efficient then you need to use a good laptop or desktop computer. You can also use the Internet to access the information that you need.With all the advancements in technology over the past decade, people are going to be using keyboards and mice in their daily lives. It is easy to use and convenient to use. The keyboard and mouse will help you in working more efficiently. With these features, people will be able to work more efficiently.The product instructions of best wireless keyboard and mouse for officeWhen you use the wireless keyboard and mouse you can set up the software to get better results. When you use the wireless keyboard and mouse you can set up the software to get better results. When you use the wireless keyboard and mouse you can set up the software to get better results. When you use the wireless keyboard and mouse you can set up the software to get better results. When you use the wireless keyboard and mouse you can set up the software to get better results. When you use the wireless keyboard and mouse you can set up the software to get better results.It is recommended to use the wireless keyboard and mouse that you have in your office. When you use the wireless keyboard and mouse, it will be possible to connect to the Internet. In order to connect to the Internet, you need to install the software that will allow you to connect to the Internet. For this reason, it is recommended to use the wireless keyboard and mouse that you have in your office. It is recommended to use the wireless keyboard and mouse that you have in your office.When it comes to choosing a wireless keyboard and mouse, there are so many products that you can choose from. A good wireless keyboard and mouse will be able to provide you with the functionality you need. They will also be able to give you the freedom to play your favorite music and work in a comfortable environment. When you use a wireless keyboard and mouse, you will be able to control your computer more comfortably. You will also be able to type faster and easier.I know you don't need to be too techy to use this. The only problem is that it is a bad idea to have someone read the instructions for something that you already know. A good laptop owner should know how to use their computer well enough to understand how to use it properly. In order to be a good laptop user, you need to be familiar with how to use your computer well enough to understand how to use it properly. A good laptop user should know how to use their computer well enough to understand how to use it properly.How to maintain best wireless keyboard and mouse for officeUsing the right software is important for your computer. There are many programs that can be used to keep your computer running well. When you use the right software, you can ensure that your computer is running at its best. If you use the right software, you can ensure that your computer is running at its best. It is important to use the right software to keep your computer running well. There are many programs that can be used to keep your computer running well. When you use the right software, you can ensure that your computer is running at its best.WiredDesktop.com has been retired. The good news is that WiredDesktop.com is still available at www.wireddesktop.com. The bad news is that WiredDesktop.com is no longer available at www.wireddesktop.com. It is also no longer available at www.wireddesktop.com.I need to get rid of my old desk. It is very small and not easy to clean. I am going to move it to a better place. And then I will have a new desk. So, what do you think? Please tell me what you think about this article. And please send me your feedback.It is really important to keep your desk free from clutter and you need to keep your desk clean and tidy. Clean desk will help you work more efficiently. Also, it will make your office look professional and tidy. In order to keep your desk neat and clean, you need to use good quality furniture and other items that will be useful for your office. When you have the right kind of furniture, you will be able to use it in your office more efficiently. A good chair will also be useful for your office. The right kind of chair will help you relax and take care of your body.Tips for buying best wireless keyboard and mouse for officeIf you are looking for the best wireless keyboard and mouse then go to www.affordableleggit.com. They have all the latest models in the market. These include both wired and wireless keyboards and mice. You can use these to work from home and be productive from anywhere. The wireless keyboard and mouse is an essential part of any office or school. It is used to make your computer easier to use and allows you to type, copy and paste text easily. The use of a wireless keyboard and mouse will allow you to access your computer from anywhere in the world.It is very important to use the right type of keyboard and mouse for your office. It is also important to choose the right type of keyboard and mouse for your office. The key point is that it is very important to use the right type of keyboard and mouse for your office. You can read more about it in the link below.This article is an online text. Please send your feedback to [email protected] or mail to [email protected] with your feedback. Please let me know if you have any other suggestions. I will update the article as soon as possible.Using the most recent models of laptops and desktops can be very useful. There are so many good laptops and desktops available in the market today, that it is easy to get confused about which one to choose. In order to make sure that you get the best laptop and desktops, you should make sure that you check out the specifications of the laptop and desktops before you buy it. You should also make sure that you compare the prices of the laptops and desktops before you buy them.The idea of using a wireless keyboard and mouse is simple. There are several good reasons why people use them. If you have an issue with your computer or device, it is easy to fix it. You just need to make sure that you use the right type of wireless keyboard and mouse. The main reason why people use them is because they are convenient. It is very easy to fix a problem with your computer or device if you use a wireless keyboard and mouse.
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