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#195718 1-May-2016 12:31
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What would you do with those old PIRs? I've made "Candle light" movement sensor.


The reason is simple - we are getting the cat soon and I was tasked to do something to see where I am going at night and did not step on the kitten :-)


Money can buy anything these days, security lights out of the box are non-expensive but so goes the fun away :-)


So instead of doing it an "easy way" and going to the warehouse - I've done it the "fun way":




1. PIR sensor from the decommissioned alarm


2. Mains to 12V adapter from whatever network system


3. MOSFET + 2 Diodes + 3Caps + 1 micro relay (or transistor equivalent could be used instead) - all from recycled power supplies


4. Empty canister from the Candle Light


5. 2 x 6V bulbs in series making 12V form the backlight of the car ODO.


End result - lights on for 15 seconds every time you walk:



If external relay is added - you can switch something else - some people were making "cat repellent" activating water sprinkles :-)





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  #1544818 1-May-2016 12:39
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Yep much more fun to make something like you're helping the environment by recycling old stuff. smile 

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