Velleman VM8090 module can be interfaced with your PC, it has eight relay channels which are controlled by your computer. Use your computer USB port to connect to the outside world. It will allow you to connect a load of up to 16A on each of the high power SPST relays. The board has space for extra VDR noise suppressors, it is provided with on board push buttons for test operating all the relays. Each channel also has LED to indicate condition of relay.