Velleman 8-channel USB relay card

Use your computer USB port to control up to 8 x 16 A loads. Board space for extra VDR noise suppressors and push buttons to test/operate all the relays. A DLL for own software development can be downloaded from Velleman's web site. Event-driven and open protocol. Timer settings up to 18 hours (DLL function). 8 high-power relays: 16 A each (resistive load), with LED indication. Difficulty level: Difficult.