- NC1- Normally Closed. Will be connected with COM1 when RELAY1 pin is set low and disconnected when RELAY1 is high
- NO1- Normally Open. Will be connected with COM1 when RELAY 1 pin is set high and disconnected when RELAY1 is low
4 Digital Pins to control 4 Relays:
- RELAY1-RELAY4 pins can be connected directly with Arduino pin number of 7-4, so that four relays could be easily controlled by the Arduino
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