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Project Notes

#055 RelayControlTest

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



An equivalent test to RelayModuleTest, however this demonstrates direct control of a Songle SRD-05VDC-SL-C relay (without the benefit of a relay module board).

This uses a simple NPN switching circuit. A flyback diode is added to protect the transistor from back EMF.


The Breadboard

The Schematic

The Build

Credits and references

About LEAP#55 ServoArduino
Project Source on GitHub Return to the LEAP Catalog

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.