This main controller board is part of a multi board build to create a MySensors based scene controller/light switch that fits inside a standard US single gang wall switch/outlet box. The main controller board consists of an arduino pro min and an nRF24L01 radio for it's connection to the MySensors main controller. There are a number of different pro mini boards out there, so you must be careful in your choice. It must be one that has the A4/A5 connections on a 2 pin header near the voltage regulator and LED. The main controller is designed to mate up with the power supply board through the use of a 3D printed board support.
This is a work in progress, so check back for revision changes.