Numato Lab's 2 Channel USB Solid State Relay Module is great for controlling your devices through USB without any USB protocol knowledge. This module plugs into your design seamlessly. Individual relay can be controlled by simple commands. This product has two onboard Solid State Relays that can switch up to 3A load. The relays and GPIOs can be controlled and read status by simple commands. The board, when attached to a PC/Laptop shows up as a serial port and all you need to control the board is a serial terminal application like HyperTerminal or Putty. This board can easily be controlled by writing a simple serial port application in VC++, VB, VBA (Word, Excell, etc), Perl, Python, etc.
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