There are a number of suppliers providing small wireless keyfob-based RC relay devices which can be used to add remote control to any project. These units typically require 12V to operate properly. This article explains how to convert one to run on 5V.
Adding a remote control switch to nearly any project is easy with these small keyfob-based RC relays. They are very inexpensive (<$20) and offer such options as MOMENTARY and TOGGLE operation as well as multiple relay channels to control.
However, from what I found, these units require 12VDC to operate properly. This article explains how to convert one to use only 5VDC.
Additionally, a further mod converts this unit to provide a simple non-mechanical logic level, +5V/0v signal to use as an input to a micro-controller input or other circuit. This allows anyone to add a remote control switch capability to nearly any project, even if they don’t need to control big loads through a relay.
In this short project I am going to explain the basics of these wireless control devices, explain which sections need to be hacked (changed) and finally how to test the modifications.