Browser-Based Morse Practice Oscillator (and Why Morse Timing Is a Protocol-Design Masterclass)

A pocket-sized Morse code practice oscillator can be built in one evening using an Arduino Nano, a piezo buzzer, one push button, and ITU timing. The project costs under $10 and fits in a mint tin, featuring a browser-based decoder. Despite turning 190 in 2026, Morse code remains vital for niche amateur-radio licensing, QRP portable operators sending 5-watt signals across oceans, and as a recommended low-bandwidth fallback within various emergency-communication plans for reliable connectivity.