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PIR Motion Sensor Light 15 LED (Modified Delay Timer)
http://forum.naddalim.com/viewtopic.php?f=30&t=2708
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Author:  tong [ Tue 13 Mar 2018 1:34 pm ]
Post subject:  PIR Motion Sensor Light 15 LED (Modified Delay Timer)

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Author:  tong [ Tue 13 Mar 2018 1:41 pm ]
Post subject:  Re: PIR Motion Sensor Light 15 LED (Modified)

TM2291.png

TM2291

Pin 1 connect to VDD (+) = Retriggerable
Pin 1 connect to VSS (-) = Non-Retriggerable

Author:  tong [ Tue 13 Mar 2018 9:24 pm ]
Post subject:  Re: PIR Motion Sensor Light 15 LED (Modified)

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Tx is LED On timer. 
Factory default is 36 second.

Tx = 40,000 x R2 (Ω) x C1 (F)
= 40,000 x 180,000 x 5 nF x 10-9
= 4 x 1.8 x 5
= 36 second


Ti is inhibit movement after LED Off timer. 
Factory default is 5.8 second.

Ti = 56 x R3 (Ω) x C2 (F)
= 56 x 2,200,000 x 47 nF x 10-9
= 5.8 second


Modified

I cut out the blue line and connect Pin 1 to V+ but it short circuit the batteries V+ to Ground. It's possible that there is some track under the IC. So can't config as retriggerable.

Next modified R2 to 475K + 475K in series.

Tx = 40,000 x R2 (Ω) x C1 (F)
= 40,000 x 950,000 x 5 nF x 10-9
= 4 x 9.5 x 5
= 190 second


Next modified R3 to 100K + 2.2M in parallel.

Ti = 56 x R3 (Ω) x C2 (F)
= 56 x 95,652 x 47 nF x 10-9
= 0.25 second


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