The circuitry used is simple: [Kevin] simply wired up two Arduino Unos with nRF24L01 radio modules, which communicate over SPI. Alternatively, an even quicker solution is to use a Keywish Arduino ...

An Arduino Pro Mini talks to a NRF24L01 which handles the wireless communication. At that point, it’s up to you – throw in as few or as many controls as you like.

The NRF24L01+ Arduino wireless transceiver shield is ideal for a wide range of applications. For instance, it can be used in home automation projects to control lights, fans, and other appliances ...