I built a Bluetooth-enabled light switch from scratch, designing the PCB and firmware myself along with an app that can control it. The device uses an ATMega328P micro-controller powered by an AC-DC converter and controls a relay and an LED. It uses interrupts to wake the processor so that it uses very little power during standby.
Here is a video of the initial prototype of the light switch with a PCB and all the components soldered. This version does not fit in the wall yet and is just a proof of concept.
This is the first version of the Wireless Light Switch concept, made on a breadboard with an app controlling the light.
This project involved using an Arduino to interface relays to the 24V lines of the HVAC system in a home. It correctly connects the various wires together in order to turn on the heating, cooling, and fan.
Shorter video explaining the Thermostat
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