SainSmart 4-Channel 5V Relay Module for Arduino Raspberry Pi –

Connecting Arduino or Raspberry Pi to a 4 Channel relay module and you will be able to control larger loads and devices like AC lights and appliances.
Connecting Arduino or Raspberry Pi to a 4 Channel relay module and you will be able to control larger loads and devices like AC lights and appliances.

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Overview: /b br p This USB Relay Controller/Data Acquisition Module allows computer controlled switching of external devices as well as full bi-directional communication with the external world (ideal for Data Acquisition applications) using the USB port of your computer.

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