This is a 1 channel Relay module, which can be used to control various appliances, and other equipment with a current not more than 10A (250VAC/60VDC).
It can be controlled directly by microcontroller: Raspberry Pi, Arduino, AVR, PIC, DSP, ARM or TTL logic.
For control of module, need 5V power and logic operation at 5V.
To isolate the microcontroller from the relay, an optocoupler is added. With this configuration, the microcontroller doesn’t have any physical connection with the relay, it just uses the LED light of the Optocoupler IC to activate the relay. This solution saves your microcontroller from a high voltage spikes for both VAC/VDC.
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