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How to make motion detector light / switch

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arghya139

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I want to light up my stairs with a motion detector light or switch to start the lights when somebody walks up or down.
Any guide or tutorial available out there that could help me with it ?
like this : http://www.youtube.com/watch?v=PZVizaSaaK8
helps are appreciated, regards
 

BradtheRad

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You might mount a photo-sensor in a position where someone walking by will change the light level.

Amplify the output and send it to trigger a timer circuit, which will switch on a light for 5 minutes (or whatever you wish).

As for the light, a single bright white LED could be sufficient. However if you want to turn on 120VAC to a lamp, then a relay is the convenient method.
 

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