High/Low Level Triger Relay Module [BDD RELAY BOARD 2CH 3.3V] .::. Communica Online

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3,3V 2 Channel High/Low Level Triger Relay Module with Optocoupler

Part No: BDD RELAY BOARD 2CH 3.3V

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Fault-tolerant design, even if the control line is broken, the relaay will not move;

Module interface:
- DC+: Connect to the positive pole of the power supply (voltage is relay 3.3V)
- DC-: Connect to the negative pole of the power supply
- IN: The relay can be controlled by high or low level
Relay output:
- NO: Relay normally open interface, before the relay is vacant, it will be shorted to COM after picking up
- COM: Relay Common Interface
- NC: Normally closed relay interface. Before the relay is closed, it is short-circuited with COM.
High and low level trigger selection:
- S1 is the high and low level trigger selection of relay 1;
- When com is shorted to low, the corresponding relay is a low level trigger. When com is shorted to high, it is a high level trigger