The motion sensor switch circuit can automatically turn on a water sprinkler but you can easily use it as a motion sensor light switch or motion activated alarm too. Before beginning the construction ...

Therefore, the 9V signal is then lowered once more using a voltage divider circuit. When the PIR sensor is triggered, it activates the timer circuit. The timer circuit is driven by a 555 timer.

The sensor does have some limits. It can only detect motion up to about 16.5 feet away. And while Philips will give you the option of reducing that — that is, only turning on lights when motion ...

If he leaves a charger plugged in when parking the car, he often returns to a drained battery. The fritzing diagram tells the story of this hack. He’s using a 7805 to power the Arduino mini.

However, the microwave motion sensor module -HB100- introduced here makes the task sweet and simple. HB100 miniature microwave motion sensor is an X-band, Bi-static doppler transceiver module. This ...