Raspberry Pi used for Morse code key entry and playback.
Century-Old 'Key On Board' Morse Code Set Auto-Translates with #RaspberryPi #morsecode « Adafruit Industries – Makers, hackers, artists, designers and engineers!
Generating Morse Code on the Raspberry Pi Using a Button on a Breadboard
GitHub - boomerwing/MorseCode-Raspberrypi-PICO: Raspberry Pi PICO and FreeRTOS. Most projects send Morse Code (CW) training text (both plain text and random characters) using FreeRTOS.
Sending and receiving Morse code with a laser and a Raspberry Pi – Dilettante