Éco'Light is a smart, touchless light switch that replaces a standard wall switch. Instead of pressing a button, you just wave your hand in front of an ultrasonic sensor to toggle the light. It also reads the ambient brightness — if the room is already bright enough, it won't turn on. Everything is controllable remotely from a web dashboard, with extra modes like a wake-up alarm, a party strobe effect, and a burglary alert. Setup is done via a phone app over Bluetooth. The whole thing runs on an ESP32, fits in a 3D-printed enclosure.