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Topic: PIR long response? (Read 2141 times) previous topic - next topic

kamhagh

hi i got a D-SUN DSN-FIR800 (HC-SR501) it takes from 10 sec to 1 maybe 5 seconds to light led after movment !

i simply connectd it to 4v and middle pin to led !

bigred1212

Well, that is a 5v sensor. You connect it to 4v and you never know what it might do.


MarkT

Passive IR detectors respond to tiny changes of temperature of the sensor due
to changes in incident far-IR radiation.  They are never going to be quick, but are
usually quicker than that.

A module might have some filter circuitry to reduce spurious responses leading
to longer delays - for instance an intruder-detector that gives false-positives is
all but useless.  Some units have an adjustable delay too.
[ I will NOT respond to personal messages, I WILL delete them, use the forum please ]

kamhagh


Passive IR detectors respond to tiny changes of temperature of the sensor due
to changes in incident far-IR radiation.  They are never going to be quick, but are
usually quicker than that.

A module might have some filter circuitry to reduce spurious responses leading
to longer delays - for instance an intruder-detector that gives false-positives is
all but useless.  Some units have an adjustable delay too.


i meant 5v that was wrong

it has potionetion meters which is so hard to cahnge but it didnt really help almsot no change ! if its normal then ok ! i will buy anotehr PIR if i needed fast mition detecting !

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