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PIR (motion) Sensor

specs

• Length: 24.03mm/0.94in
• Width: 32.34mm/1.27in
• Screw hole distance: 28mm
• Screw hole diameter: 2mm
• Height (with lens): 24.66mm/0.97in
• Weight: 5.87g/0.2oz
• https://www.adafruit.com/product/189

Runs on 5V-12V power (if you need to run it off of 3V you can do that by bypassing the regulator, but that means doing a bit of soldering). Digital signal output is 3.3V high/low. Sensing range is about 7 meters (120 degree cone). src: adafruit.com

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guide	url
Adafruit: PIR Overview	https://learn.adafruit.com/pir-passive-infrared-proximity-motion-sensor/
PIR Motion Sensor Tutorial	http://www.instructables.com/id/PIR-Motion-Sensor-Tutorial/
Sparkfun: PIR Motion Sensor Hookup Guide	https://learn.sparkfun.com/tutorials/pir-motion-sensor-hookup-guide