Create a Node-RED flow to test relay

eklem / greenhouse-automation

Greenhouse automation based on Raspberry Pi and Node-red

MIT License

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Create a Node-RED flow to test relay #3

Open eklem opened 4 years ago

eklem commented 4 years ago

Use a multi-meter to measure, just create a button to trigger the flow.

eklem commented 4 years ago

The COM (Common) connection of a relay is the part of the relay that moves. When a relay is off, the COMMON is connected to the NC (Normally Closed). The NO (Normally Open) connection of the relay is not connected until the relay turns on.

This means:

12-volt on the COM-port and one of the solenoid ports
Wire from NO-port to the other solenoid port.