Last Updated or created 2025-10-27 Using above schematic and attiny program you can make a mini morse trainer. It runs on a single CR2032! I’ve got an attiny85 programmer as pictured below. An Attiny85 chip is an 8 pin microcontroller, but with far less pin’s, and it’s most of the time just a DIP/DIL (Dual … Continue reading Morse with an ATTINY85