If you need to control AC or high current, high voltage load, this will be the perfect board. Easy to use and suitable for beginner, and of course student too. It even comes with activation LED indicator for each relay. Each control signal is opto-isolated, protected. This is ready breakout board with four (4) 5V activated relays, with 3 screw terminals for each relay (NO, NC, COM) and screw terminals for control signal from microcontroller such as Arduino. This is the universal Relay breakout board that I like it. In simple words, each relay can be configured as 5V(High) activation or 0V(Low) activation. Extra isolation with opto-coupler at the front end of control, and the activation logic for each channel is configureable via mini jumper. It comes with 4 channels of 5V activation relay, ready to control 250VAC at 10A.
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