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12V one 1 Channel Relay Module With optocoupler ? Answered

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Hello,
I bought this 12V one 1 Channel Relay Module With optocoupler by mistake. And I can't figure out how to use it : http://www.ebay.com/itm/172217000566

I was supposed to buy a 5v relay to use it with a nodemcu.

But on this one I can't understand the pins.
Can someone help ?
Thanks.

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user
Josehf Murchison (author)2017-03-15

NC normally closed

COM common

NO normally open

They go to the circuit you want to control.

As is; not connected to anything if you check with a multi meter you should get continuity between NC and COM, and no continuity between COM and NO.

When hooked up and the relay tripped; you should get continuity between NO and COM, and no continuity between COM and NC.

VCC source voltage with a jumper to +.

Use the jumper between VCC and + only if VCC and + is the same voltage and control source.

Without the jumper between VCC and + VCC is source voltage and + is control.

- can be jumper to one of the two GND or used as - control.

And of course GND is ground.

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user

Connect it like this.

The schematic is missing the internal circuitry.

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user
iceng (author)2017-03-15

After noting it works with 3 kinds of uP it works to activate with a 4 to 5v signal IN and releases when 0 or below 1v at the IN with respect to GND.

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seandogue (author)2017-03-15

the three green connector connections are for the output. If you want the device to turn off on detection, connect using the common (COM) and normally closed (NC) terminals, if you want it to turn on on detection, use the com and NO terminals

on the input side, connect your power supply to Vcc and gnd. Connect the VCC powered sensor using the two pins labels IN+ and IN -

you'll have to ask the mfg for particulars regarding required values for the inputs.

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