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antiAFK Firmware

Arduino code for antiAFK project by Galvant Industries.

The associated PCB project can be found on GitHub at

Pre-assembled boards can be found at


This code turns an Arduino Leonardo-compatible board into a USB keyboard which provides periodic random keypresses to the attached computer. The time between key press events are defined by two parameters, period and variance, such that period +- random(variance) is when the next key will be pressed. This value is generated down to 1 millisecond resolution. Both period and variance can be changed by the user and is preserved through power loss.

Once the appropriate amount of time has elapsed, a random key from a pre-defined set is sent to PC. By default this is wasd and space. This key set can be changed by the user and is preserved through power loss.


The inspiration for this project came from my time playing MMORPGs. These games usually involve a persistent online world that involve you logging into a server in order to play. Typically when a player reaches maximum level, these games feature some sort of "end-game" group content, commonly referred to as dungeons, raids, or something else. Because of the group requirements, guilds will schedule a time for everyone to login in order to tackle it.

Here is where the problem is. Some of these games are very popular can will have a login queue. Sometimes this delay can be upwards of an hour for some servers in games like World of Warcraft. This means you have to login well ahead of time of the event , and also ensure that you do not get logged out. Most of these online games will have a inactivity timeout period where you are automatically logged out after a certain time of no input.

Imagine this situation. Your raid is coming up, but your server is so popular that there is a 1 hour queue time. Thankfully you're already logged in, but you want to get up away from the computer. Normally you would get logged out, but instead by using the antiAFK you can stay logged in. Every few minutes it sends a key press in such a way that it really looks like a person is sitting there hitting a semi-random key on a USB keyboard every now-and-then.

This has the advantage over software solutions in that you are not running code that might get you flagged for "botting". Many MMORPGs will scan system memory to check for unauthorized software running. The antiAFK presents itself to the PC as a completely legitimate HID keyboard, the same as your real USB keyboard does!


Plug the antiAFK into an available USB port. On Windows, the first time you do this you will get a device driver error. This is associated with the virtual serial part and not the USB keyboard part. If you have no intention on changing any settings you can safely ignore this.

After your PC is done acknowledging that you have plugged in the antiAFK board, make sure that your PC game is the active window. Then, when you are ready to activate it, press the push-button on the board. In order to provide some feedback, one of the valid keys will be immediately pressed.

You can now safely walk away from your game without worry that you will be automatically logged out. However, do note this will not save you from players reporting you being away during player vs player matches!

Once you return, simply press the button again to deactivate the key presses. Or, one could just remove the antiAFK from their PC USB port.


To compile and upload this project, the following is required. Note that pre-assembled boards already have the code loaded and thus this section can be ignored if you have no intention of compiling the source code.

Required dependencies:

This can be installed on any Arduino Leonardo-compatible board using the official Arduion IDE typical installation methods.

When building your own, the push button is connected to digital pin 4 with a pull-up resistor. You can change this as you see fit by modifying the source code.


Period, variance, and the key set can all be changed by the user via the virtual serial port. The easiest way for most will be to use the serial monitor built into the Arduino IDE. Most users will find that the defaults are sufficient for most's needs.

period:10000 This will set the period to 10,000ms = 10sec. Period is stored in an unsigned long and thus the max value is 2^(32)-1.

variance:5000 This sets the variance to 5,000ms = 5sec. Variance is stored in an unsigned long and thus the max value is 2^(32)-1.

keys:w asd This would set the valid keys to wasd and space. Note that for this example the space was located between the 'w' and 'a', but that is not required. It was simply done to help show that there is a space.

toggle This can be used to toggle the running state of the antiAFK board without having to activate the physical push-button.

debug This command will toggle on/off the sending of debug messages back to the PC over the virtual serial port. The default is off. This setting is not saved through power cycles.

keyboard This command will toggle on/off the actual keyboard key presses to the PC. The default is on. This setting is not saved through power cycles.


This code is released under the AGPLv3 license. A copy of the license, as well as author information can be found in the LICENSE folder.


Arduino code for antiAFK project






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