So, how do I enter data into my raspi. Well, I've done a single button keyboard before using V-USB, but it would be obnoxious to use only a few buttons for a whole keyboard. Wait! I already have an entire keyboard on my laptop. If only I could use it with my raspi. That is where this project comes in.
In this project I used a python script to detect key press on the laptop and then send them via serial to an ATTINY2313 with V-USB that converts the serial data into key presses on the raspi.
To detect key presses on my laptop I have a python script running. It uses the msvcrt library, which only works in windows. It also cannot detect the CTRL, ALT, SHIFT, or CAPS keys by themselves. Though if you press SHIFT and a letter it will read it as a capital letter. The same goes for CTRL, though some keys overlap with other buttons (i.e. CTRL-H returns 8 which is that same as Backspace). This data is then sent to the microcontroller with serial. The ATTINY then receives this data and sends the corresponding character using V-USB.