HC-SR501 Datasheet PDF - ETC
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PIR Sensor (HC-SR501)
Passive Infra-Red (PIR) sensors are used to detect motion based on the infrared heat
in the surrounding area. This makes them a popular choice when building a system to
detect potential intruders or people in general. These sensors can take for 10-60
seconds to warm up, so try to avoid motion during that time.
• PIR Sensor
Below is the schematic for using a PIR sensor. It is fairly simple.
Adafruit has a really good tutorial for how these sensors are used and various projects
Below is the code for working with a PIR sensor. It should be noted that the PIR
sensor does not respond immediately when motion stops. This has to do with the two
potentiameters on the sensor.
Free Datasheet http://www.datasheet-pdf.com/
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1. Motion Detector - Sensor Module
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