ESP8266-12E module with relay to control home switch over WiFi. The board also has a 100-230VAC to 3.3VDC converter built in, so no external power supply. Header available for program-ability using USB to UART adapter. Also, comes with example code using - WiFiManager/Blynk which alows you to control switch using blynk android/ios application.
I was tired of having to go outside to turn off my exterior Christmas lights. I would also sometimes forget to turn them off at night before bed. Now, I can either control them through my phone, from anywhere or just set it on a timer mode.
The reason this is so special is that this switch can be as simple or as complex as you would like it to be. No coding is needed, just plug in download the app and Bobs your uncle!
Warning: AC mains is hundreds of volts, and is potentially lethal. Please take all necessary precautions before you start working with it!
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Day to day I do pcb design work and sometimes I build things after hours that contribute to my laziness.