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Light Sensor Project

Discussion in 'Electronic Basics' started by Simon Griffiths, Jul 23, 2004.

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  1. Dear All,
    I am about to add the basic electronics to my project which
    consists of two light sensor circuit boards - one for dark, the other for
    light. I have wired both to a motor and thus this operates the motor forward
    and reverse. My question is how do I stop both circuits coming on at the
    same time and shorting the motor/battery? I was advised that a latching
    relay would do this but am still unsure about this? Any help is really
    appreciated - I'm a bit of a thickie when electronics are involved. Thanks.

  2. andy

    andy Guest

    why do you need two light sensor circuits? couldn't you just have one and
    invert the output to make the other? Or else just have one and use it to
    drive a relay, which crosses the motor drive cables over the other way
    round when the light goes dark? i.e. the power is always on, but just
    switch it the opposite way round for reverse. Then you just have to make
    sure the relay is a 'break before make' type.

    not sure what your project is though, so this may not make sense.
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