Portable CPO

Note: You will need a small hardware circuit (Raspberry Pi Pico, the paddle and three jumper wires) to be able to use this app. https://github.com/kholia/SupportPortableCPO has the instructions. Please talk to us (dhiru.kholia@gmail.com) before buying this app - thanks! Practice Morse Code using external physical paddle with this CPO app! This app can replace the 'MFJ 557 Code Practice Set' and similar equipment.