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IR Alarm niggles

Discussion in 'General Electronics Discussion' started by 3wsparky, Aug 22, 2012.

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  1. 3wsparky


    Aug 22, 2012
    Hi all, i'm by no means an electronics person but get by for the most part.

    I have installed two IR sensors for an alarm system and i'm having an unexpected issue, basically the IR sensors go through an L shape with the assistance of a mirror which works a treat until the weather changed abit and now when the dew settles for the night it eventually covers the mirror so much that the light is lost, i was thinking because the mirror is in a location of now power source if I could use a battery and solar panel with a couple of resistors across the mirror to prevent it from fogging up, and there in is the question,

    What size resistors should i get / look at that would give just enough warmth to prevent the mirror from fogging.

    12 volt battery - car or motor cycle depending on the amp hours i will need.

    other ideas also welcomed, i also thought about having a moisture strip across the glass and if it detects moisture then power on the resistors, my thoughts there are that it will use less power or maybe more to monitor?

    thanks for reading guys
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