Hi, I'm creating a small USB stick project that will type a phrase on the screen when plugged into a USB port. I'm targeting the RP2040 or ATmega32U4. I'm more for the first one, but I'm curious if it would work well (or work at all).
Both the RP2040 and ATmega32u4 can simulate a HID (Keyboard/mouse) device.
Search for "USB rubber ducky" and add the MCU you wish to search (rp2040 or ATmega32u4).