This is a 1 channel 5V relay module with screw terminals that makes it very simple to connect. The module can be controlled directly by a wide range of microcontrollers such as Arduino, AVR, PIC, ARM, etc.
The board has a power indication and a relay status LED to ease debugging. Power input and relay control signals are brought to header pins on the board.
5mm LED – Green (Pack of 50)
8 Channel 5V Relay Module with Opto Coupler 



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