Building an Arduino speed detector using IR technology to measure the speed of a moving object is much more cost-effective, ...

Because his blinkenlight shield can be used as a light sensor, all that’s needed is a mirror and a pretty long line of sight. There’s a few problems with the setup though: with the Arduino ...

To fix this problem, he added an ambient light sensor. The Arduino can detect the amount of overall ambient light and then adjust each reading to compensate. He says it’s not perfect but the ...

On the software end, the Arduino code is pretty simple ... There's a tripwire — made up of a laser directed at a light sensor — that's placed somewhere the intruder can easily trigger ...