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PIR motion sensor

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PIR sensor type HC-SR501 allows for motion detection on the basis of infrared radiation. The detector detects the change of 2 separated IR windows and the amplifier converts the signal pulse with a high logic level. Such a signal can easily be used to drive a transistor or logic input processor. In the case of the use of Lan Controller detector output must be connected to a logic input INP1-4D. Note, however, that forced the detector Low Low condition is a state of rest, and the high high points to the liberation PIR-a.

On the board there are 2 potentiometers described as Sx i Tx.

Tx-sets the high state after operation of the detector – for several time s potentiometer should be a paragraph. roughly 9 per hour.

Sx-sets the delay vigil after the final liberation – here changes very little adjustment in a short time frame.

The sensor operates in retriggerin, i.e. in the case of motion detection at the output is maintained at all times high.


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Power supply


current consumption:

ok 50uA

Working range:

up to 7m

Viewing angle:

360st x100st


High - motion detection, Low - lack of exercise