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Project Notes

#054 RelayModuleTest

Controlling a relay “module” with an Arduino. Here’s a quick demo:



A quick test of a pretty common relay board, the Keyes 5V Relay Module for Arduino.

The relay board includes a transistor switching circuit (to minimise the current drain on the control signal) and diode shunt protection.

So using it is as simple as connecting 5V power and a control signal on one side, and then the relay-switch circuits on the other. The relay offers both normally opan and normally closed circuits. Either or both can be used.

In this case, I have a motor attached to the NO circuit, and an indicator LED on the NC circuit.


The Breadboard

The Schematic

The Build

Credits and references

About LEAP#54 ServoArduino
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This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is my personal collection of electronics projects, usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting (IMHO!).

The projects are usually inspired by things found wild on the net, or ideas from the sources such as:

Feel free to borrow liberally, and if you spot any issues do let me know. See the individual projects for credits where due. There are even now a few projects contributed by others - send your own over in a pull request if you would also like to add to this collection.