Atmega32u4 Keyboard Schematic. Keyboard Modifiers and Non-ASCII Characters. The decoupling capacitor section has been corrected to add a missing capacitor.
After I bought some pieces of LilyGo BadUSB my first thought was that the board should also be used for anything other than keyboard emulation and evil things. This makes writing USB native programs such as serial ports mousekeyboard mass-storage-controller MIDI etc very easy. The ATmega32u4 microcontroller is an excellent choice for any HID device such a mouse a joystick or a keyboard.
The resulting schematic is pretty much complete.
The main chip is an ATmega32u4 an 8 bit AVR-core processor which has the bonus of a USB core built in. The following information needs to be edited -. You can now send keyboard modifiers and non-ASCII characters using the Keyboard Write Press and Release member functions detailed in Part 1 above. Keyboard Schematic Open in Editor.
