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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

Project Source on GitHub Project Gallery Return to the LEAP Catalog

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

LEAP is just my personal collection of projects. Two main themes have emerged in recent years, sometimes combined:

  • electronics - 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
  • scale modelling - I caught the bug after deciding to build a Harrier during covid to demonstrate an electronic jet engine simulation. Let the fun begin..
To be honest, I haven't quite figured out if these two interests belong in the same GitHub repo or not. But for now - they are all here!

Projects are often inspired by things found wild on the net, or ideas from the many great electronics and scale modelling podcasts and YouTube channels. Feel free to borrow liberally, and if you spot any issues do let me know (or send a PR!). See the individual projects for credits where due.