At the heart of the circuit is a PIR sensor module SB0061. SB0061 is a pyroelectric sensor module which developed for human body detection. A PIR detector combined with a fresnel lens are mounted on a ...

The LDR must be soldered in a way that it can comfortably see ambient light through the Fresnel lens. The tiny microcontroller brain. To be frank, using a microcontroller is probably overkill for most ...

[ladyada] has a freshly-published and amazingly thorough tutorial on passive infrared (PIR) motion sensors. Most often seen in security floodlights and automatic doors, in creative hands these sens… ...

Though it might superficially resemble one, the lens in front of a PIR sensor is not (necessarily) a Fresnel lens. It’s a set of independent lenslets (each of which could be a Fresnel, but ...

Using motion detectors and an Ardunio you can add a little extra wow to your Halloween displays this year. This article covers the circuits and the code to make that happen.

Passive InfraRed sensors (PIRs) are electronic devices which are used in some security alarm systems to detect motion of an infrared emitting source, usually a human body.