A relay is a switch that can be used to control large current devices. It is especially useful in home automation, motoring and robotics applications.
This is a 12V, 4-channel relay module that can handle up to 10A current with 250V AC or 30V DC. A distinct feature of this module is that it can be controlled from a PC via USB port. It present itself as a HID class device, therefore no driver is required.
Each relay has a status indicator LED and three output terminals (normally open, normally closed and common terminal).
The board needs a stable 12V DC external power. You can connect the common 5.5mm x 2.1mm barrel plug or 2-pin wire DC source.
Software
For Windows environment, a software package with sample codes and libraries will be provided that can help you to develop your own control software. Command line and GUI control softwares are included as well that you can use to operate the module.
For Linux (yes, this includes Raspberry Pi and BeagleBone Black), darrylb123 has written codes that uses a cross-platform HIDAPI library. You can use it as a starting point to control this relay.
Other components required
Only the relay board is included. You'll need other common parts below to run it. You might already have them around but if not, be sure to buy them as well.
