CHRISSI I/II: ATTiny85 telegraph (prototype)
Channel: Alone in the Kitchen — by Nino Ivanov
Date: 2023-12-23

#Telegraphy time! In this video, on a particularly "weak" #microcontroller — the #ATTiny85 on a Digistump board, offering only five I/O pins — a sort of telegraph is shown. You can transmit the letters A-Z plus "space", and each letter is "displayed" using a 3x3x3 grid. Two systems communicate with each other over a serial connection, RS232 9600-8-N-1 baud (and could also be used as a computer keyboard, if one were so inclined; it is not Morse Code). The telegraph even features an "automatic transmission mode", where a message can be recorded to be replayed in a loop. License is Affero GPL v3 and the technical details plus source code are available here: https://github.com/KedalionDaimon/CHRISSI