Looking to place the footprint down on my in-progress second version of my NodeMCU layout, with a...

[G+_Rud Dog]

Looking to place the footprint down on my in-progress second version of my NodeMCU layout, with a relay board (shown below). If anyone knows where I can find either the printed version fo the Geber file or the schematic for this relay board it would really help.

[G+_Paul Hutchinson]

Perhaps the Chinese characters indicate it but without knowing who the manufacturer is it is nearly impossible to find any information because so many different manufactures make similar looking units.

[G+_Rud Dog]

Was looking for someone that might have reverse engineer the PCB board and created a schematic. If not will have to see if I can do the deed.

[G+_Paul Hutchinson]

Without knowing what brand/model that assembly is it's impossible to help out. Even just a link to where you got the photo would be a start.

 

If you aren't wedded to that particular brand/model then you can choose a similar assembly from one the open hardware vendors (Adafruit, Seed, etc.) and grab their schematic/PCB layout documents.

[G+_John Sullivan]

What would you like to know about it?

It's a SPDT relay (single pole, double throw). There are three connectors on the right side in your photo. Those connect to the device you want to control. (Whether you want your device to be On when the blue relay is not energized, or Off) When the relay is not energized, the center connector connects to one of the outside ones, and when it is energized, the center connector connects to the other outside one. (You can test this with a multimeter)

 

The blue relay takes more current to energize the coil than can be provided by a microcontroller (Arduino or other) so there is a small, black relay on the board also. The Arduino triggers the small relay and then that triggers the big blue one.

 

The connectors on the left of the photo are GND, VCC and IN. You connect the VCC to a voltage supply that can provide enough current to trigger the blue relay, ( 5 v DC at about 0.5 amps or so) and the IN connector to the output of your microcontroller. Both the ground from the microcontroller and the ground from the power supply connect to the GND pin.

 

When the output of your microcontroller goes HIGH (5V) it energizes the small black relay, which then energizes the big blue relay, and thus turns your controlled device on or off.

 

The other components on the board are just current limiting resistors and diodes to prevent the relay contacts from arcing.

[G+_Rud Dog]

Thank you all. Found the schematic I was looking for. Anyone else in need of it here it is. Well I tried to post it here but it was not allowed. Will try a new post with pic.