But probably the worst is that the proximity sensor is inconsistent. ... At $25.50, the Child Guard proximity alarm isn't something I can really recommend.

Using the TSSP4P38 proximity sensor, I built a small device that activates the electric circuit to ring the doorbell when it senses anything staying in front of the door. Typical alarm systems would ...

This tiny proximity sensor looks like a nifty chip, providing distance measurements up to 200 mm and an ambient light sensor in one package. The routing table has an LCD display and buttons, ...

The sensor shown here is essentially two plates mounted side-by-side, attached to an Arduino Nano using the Capacitor library which uses just two pins, one digital and one analog.

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