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Modifying Cheap PIR Motion Sensor to Work at 3.3V

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This PIR motion sensor is a $2 sensor that is used to detect movement from humans or pets. You can read my previous tutorial on how to use this sensor with an Arduino.

I’m currently working on a new project and I needed to make this module operate at 3.3V. By default this module runs at 5V, but it has an on board voltage regulator that drops that voltage to 3.3V.  With a quick online search I’ve found a blog post that explains how you can bypass the voltage regulator and use this module at 3.3V, which is exactly what I needed.

Where to buy one?

You can click here to purchase one of these modules on eBay for less than $2.

Before soldering

Some of these modules come with pins soldered in that top right corner, so you don’t have to solder anything. You would simply connect a jumper wire to that pin that is highlighted in red (see Figure below). With my particular sensor I had to solder a small wire.

pir_motion_sensor_arduino

After soldering

Here’s how it looks, now if you supply 3.3V through that red wire your module works at 3.3V.

pir_motion_sensor_arduino_3.3V

Testing

I’ve tested this sensor with an Arduino using this code. The only difference between that previous blog post is that now I can power my module with the 3.3V pin of the Arduino!

Do you have any questions? Leave a comment down below!

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