CHRISSI II/II: ATTiny85 final telegraph design
Channel: Alone in the Kitchen — by Nino Ivanov
Date: 2023-12-27

Final variant, showing how a #telegraph — with automatic transmission function — can be created, based on an #ATTiny85 microcontroller #Digistump board, transmitting 27 symbols (26 letters + "space") by way of a 3x3x3 Polybius "cube" (over RS232 9600-8-N-1). Different from the prototype shown previously is that the keyboard is now hooked on two analog pins (previously: one), and the output uses one pin (previously: two) to show letter co-ordinates. The design materials and code can be found here, under the GNU Affero GPL v3 license: https://github.com/KedalionDaimon/CHRISSI