Adafruit PIR Motion Sensor
$9.90
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PIR sensors are used to detect motion from pets/humanoids from about 20 feet away. This one has an adjustable delay before firing (approx 2-4 seconds), adjustable sensitivity and we include a 1 foot (30 cm) cable with a socket so you can easily re-position the sensor or mount it using the two drills on either side 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)
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