Arduino Nano Keyboard Emulator4/8/2021
I started out by searching the online Arduino help web pages and discovered that native Arduino software libraries exist to support creating a USB Human Interface Devices (HID) such as a keyboard, mouse or gaming joystick.
![]() Arduino Nano Keyboard Emulator Software Libraries ExistBetter yet, there are several Arduino-savvy power users who have figured out and shared their knowledge with the rest of the Arduino user community. Heres the gist of the solution: The Arduino UNO board needs to be put into Device Firmware Update (DFU) Mode. While in DFU mode, the Arduino boards USB interface firmware is changed from a USB Arduino programming device to a USB keyboard interface device. While a keyboard device, an Adruino sketch can include sending keystrokes to the USB host device such as a PC or Mac. In the following discussion, I am going to refer to Programming Mode (PM) and Keyboard Mode (KM). These are just terms I have created for the purpose of this description. The fore-mentioned DFU mode is a more commonly used term that we will recognize as an intermediate state required to toggle between these other two states. So, to start, compile and upload your Keyboard Mode (KM) sketch the same way you would normally for non-KM sketches. Done For details, please refer to solved DFU Mode Arduino UNO without soldering. So, when you are finished running the KM sketch, you need to use DFU mode to upload the original PM firmware ( Arduino-usbserial-uno.hex ). The process is similar to going from PM to KM,except that this time the dfu-programer command is used to upload the PM firmware (.hex) file. The KM sketch may begin to run, but no keystrokes will be sent to PC or Mac. After that the trick was toggling through the modes to write the sketch. Sorry dear reader, but I moved on before really putting together the kick-ass USB game controller that Id originally intended. They come, then go. Despite this, Ive decided to publish what I figured out As-Is to help some aspiring hacker to perhaps carry on from where I left off.
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