Or flip a switch at the bottom of the stairs, and then again at the top. The next person, coming from either direction, must be able to turn the light on again. That's where 3-way switches come in.

This switch can only be used as a single pole switch not 3-way and 4-way. This WiFi light switch is compatible with 2.4GHz Wi-Fi only and no Hub is required. 【 Voice Control and Home Automation ...

So why not play it safe and make use of your light switch? Admittedly, it wasn’t because [Tyler Bletsch] didn’t want to mess around with AC directly, but rather out of necessity. You see ...

Back when he was first starting out in electronics he built this infrared-controlled light switch that works with a standard TV remote control. [Vadim]’s first few projects ended up as parts for ...