Home Assistant – Teaching an old dehumidifier to tell the truth (sniffing the TM1618 display bus)
Introduction: Some projects nag at you for years. This is one of them. About three years ago I transplanted an ESP32 into the cheap-and-cheerful dehumidifier that keeps our conservatory habitable, wired a relay across its ON/OFF button, and called it “smart”. The trouble was it could press the button but it never really knew whether […]