Digital Engine Tachometer with ESP32 and Optocoupler
đź”— Full Guide · Transcript Build a simple, accurate digital tachometer for your engine using an ESP32 “remote hub,” a ~$2 optocoupler, and ESPHome/Home Assistant. This guide covers wiring (alternator tacho → optocoupler → ESP32), ESPHome setup with a pulse counter, RPM calibration from real data points, optional engine-hours and engine-active entities, and a dashboard […]