Richard Saville, aka Average Man, has been testing out the ModMyPi PiOT relay board. He goes through the various functions of the board and even tries them out using a cheap Dremel-like hand drill… He does, however, point out that this is a bad idea and that mains voltage is not perhaps the best use for this board. It’s good for lower voltages, what he terms Maker Voltages. Read the review here.