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well when you talk in electronic subjet we said circuits you need ,but you normally buy a seurity ir detector and put (don´t know this in english contator is mall piece with metal like electric engines and 2 votages gates one is generated for ir detector and the other one is for you main circuit as alarm when the ir detector turn on that part of the contator the both circiuts turns on) both are normally close

another is a laser alwais on mirror and circuit who detect when light is off that circuit I know needs diode sensor and chip with gates and true table

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12y ago

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