User Manual

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HC SR501 PIR Functional Description
The SR501 will detect infrared changes and if interpreted as motion, will set its output
low. What is or is not interpreted as motion is largely dependent on user settings and
adjustments.
Device Initialization
The device requires nearly a minute to initialize. During this period, it can and often
will output false detection signals. Circuit or controller logic needs to take this
initialization period into consideration.
Device Area of Detection
The device will detect motion inside a 110 degree cone with a range of 3 to 7 meters.