The switcher project allows remote RF mains power switches to be controlled from a variety of devices and has been a vehicle for learning (Ethernet interfaces on NXP Arm Cortex and Atmel microcontollers). I share details here of the hardware and software that I have developed in the course of the various stages of this project as they maybe useful to others.This project has been superseded by the Ysw2, Ysw3 and Ysw8 projects.