He’s developed his own motion activated AC switching circuit to turn the ... [brmarcum] is using a Parallax PIR sensor which requires 4.5V. Therefore, the 9V signal is then lowered once more ...

When the PIR sensor sees something it transmits a code the base station where the ‘motion’ alert message is displayed. The entire device is powered by a 9V battery and stuffed inside a ...

This motion detector alarm can detect a moving person from a distance of 1 meter. It uses a dual IR Transmitter-Receiver module HOA1405. When the sensor detects the reflected IR rays, alarm will sound ...

Ultra simple circuit of the tilt sensor alarm presented here can be fabricated using readily available inexpensive components. The circuit is a true transistor based design. Home made Tilt sensor for ...