How To Use A Relay

Useful Links

Here’s the link to the relay board I mentioned:

https://www.amazon.com/dp/B00LW2G7V6

I’d also recommend getting some wires like:

https://www.amazon.com/dp/B005TZJ0AM

Wiring Diagram

And here’s how to wire it up to the SIM:

Here's a diagram for a generic relay:

Other Considerations

Here’s a few things to think about for higher power or higher voltage relays. In addition to coil relay voltage (as discussed in the video), every relay has voltage and current ratings for the switch side of the relay. For example, in the image above, you can see that on each of the blue relays is printed “10A 250VAC, 10A 125VAC, 10A 30VDC, 10A 28VDC”. This means that the switch in the relay can handle 10 amps (10A) at each of the listed voltages. So it’s important to understand both the voltage of the device and how much current it can pull. All devices should have this information listed somewhere.

In summary, make sure that the relay you select has current and voltage ratings HIGHER than what your device uses. This will help avoid frying or otherwise damaging your relay and/or device.