Member #494226

Member Since: December 2, 2013

Country: United States

  • It’s not a motion detector. It does not “see” movement. It looks at a target and sets itself to that. When a hotter or colder temp is detected the signal pin is switched. In a commercial PIR there is a counter which is used in conjunction with a segmented lens. As the warm or colder target is seen through the lens, the counter is incremented. When the preset count is reached the support circuit switches a relay that is wired to an alarm panel. The major problem with PIRs is not being installed correctly. Sun light creeping across a floor or the warm air from a heater vent can set them off. If you have a cat and want to use one of those, be ready for a pot load of false alarms. They climb everywhere and it’s impossible to compensate for them. And if you want to use them for open air surveillance, they don’t do too well. Better to have a fixed object like a wall in the field of view.
    I designed and installed high end security systems for 25 years.

  • You could use these micro solar cells as active sensors. Since they generate their own power they would not have to be powered off the controller. I fly quad rotor RC models with lighting on them for show. During the day one of these on a load switch would keep the lights off. In the absence of ambient light the lights would be switched on. Seeing as electric RC models run on batteries, having something that doesn’t draw off current would be a plus. There’s a board on here somewhere that has opto isolators that gate some mosfet switches. One of these could drive the led in the opto isolator. Hmmm

No public wish lists :(