[tutorial] How to use a Magnetic Door Switch / Sensor With Arduino

Introduction

In this tutorial we will use one magnetic - contact door sw / sensor and a buzzer for making a "noise" when a door is opened. Normally the reed is 'open' (no connection between the two wires). The other half is a magnet. When the magnet is less than 13mm (0.5") away, the reed switch closes.

What you will need

For this project you will need:

• Arduino uno
• Magnetic Contact Switch - Door Sensor
• Buzzer
• Breadboard and some cables

The circuit

The connections are pretty easy, see the above image with the breadboard circuit schematic.

The Code

Here's the code, embedded using Codebender!

Try downloading the Codebender plugin and clicking on the "Run on Arduino" button to program your Arduino board with this sketch. And that's it, you've programmed your Arduino with this sketch!

Well done!

You have successfully completed one more "How to" tutorial and you learned how to use a magnetic contact switch with Arduino.