It’s a fairly simple project, too: just hook an Arduino Uno up to a motion sensor ... and OutPin defined as “3”—these correspond to where you plugged the PIR sensor and power relay into ...

For his sensor, [Felix] is using a Moteino, a very tiny Arduino ... three pins – power, ground, and out. When the PIR sensor sees something it transmits a code the base station where the ...

The Arduino is a cheap ... Tutsplus has a great tutorial on how to connect an LED to a power source and add a button. Take time to assemble this and understand the circuit you just assembled.

Using motion detectors ... can use multiple sensors and outputs to trigger different effects depending on your needs. The Arduino is capable of driving small loads like an LED without extra ...