Introduction: Wireless Communication Alarm Two Arduinos Using NRF24L01

Wireless communication is cheap and easy with arduino and the NRF24L01 module.

We are going to build a simple alarm that can be controlled from a remote arduino with the push of a button.

Step 1: Wireless Module and Wiring

The wireless module we are using is the NRF24L01. It is a cheap radio operating at 2.4 Ghz.

Follow the schematics and wire up the two arduinos like in the picture

Step 2: Code

Code for master and slave can be found here