PIR Motion Sensor Light 15 LED (Modified Delay Timer)

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tong
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PIR Motion Sensor Light 15 LED (Modified Delay Timer)

Post by tong »

01.jpg 02.jpg
tong
Site Admin
Posts: 2381
Joined: Fri 01 May 2009 8:55 pm

Re: PIR Motion Sensor Light 15 LED (Modified)

Post by tong »

TM2291.png TM2291

Pin 1 connect to VDD (+) = Retriggerable
Pin 1 connect to VSS (-) = Non-Retriggerable
tong
Site Admin
Posts: 2381
Joined: Fri 01 May 2009 8:55 pm

Re: PIR Motion Sensor Light 15 LED (Modified)

Post by tong »

22.png 21.png
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
23.jpg
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