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 in line)

When using the Arduino IDE:

• Preferences : Add board url :
  https://raw.githubusercontent.com/damellis/attiny/ide-1.6.x-boards-manager/package_damellis_attiny_index.json
• Set board info like: (NOTE PROGRAMMER USBasp)

• Burn bootloader
• After that compile and upload

Source code used: https://github.com/andyhighnumber/Attiny-Arduino-Games/tree/master/MorseAttinyArcade

I had to short JP2 to get the USBasp into slow burn mode, else the attiny85 could not be found

Hard to do without a propper morse key!