when it detects a moving target. Most Digital PIR sensor modules have three connector pins: Vcc (5V), Ground (0V), and Output. The output is a digital LOW or HIGH, depending on whether the sensor has ...

[Brad] was asked by his Sister to design a motion-based alarm that would help her catch her son sneaking out of the house at night. Obviously this didn’t need to be a long-term installation s… ...

All you need is an Arduino, a motion sensor, a few wires and headers, and the code provided at the site below. Hit the link to see step-by-step instructions on how to put it together.

It’s a fairly simple project, too: just hook an Arduino Uno up to a motion sensor and an electronic switch called a relay, then plug in your fan, and you’re good to go.

The base software was borrowed from [Eloquent Arduino]. The algorithm is pretty simple. The code grabs a frame of video and divides it into 10 vertical zones, one for each degree of motion for the ...