“This tutorial is one among many when it comes to using a Raspberry Pi to control wireless devices around the home. Like many others, it will show you how to use a cheap transmitter/receiver pair hooked up to your Pi to interact with devices operating on the commonly used 433MHz radio frequency band. It will specifically show you how to turn any electrical device on or off using your Pi by transmitting commands to a set of 433MHz remote-controlled power sockets.”