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Light Dependant Resistor

Discussion in 'Electronic Basics' started by [email protected], Mar 26, 2007.

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  1. Guest

    I've just pulled a solar garden light apart and the LDR is connected
    to the little LED board with single wires shrouded in a loose cloth
    type of insulation. I want to separate the LEDs from the solar panel.
    The LEDs being inside the house, and the PV panel including LDR being
    outside. I was going to connect the two with a length of figure 8
    cable through a small hole in the window frame. Will this be a
    problem? Or does the LDR have a specfic connection need?
    TIA, jack
  2. ehsjr

    ehsjr Guest

    From your description, you won't be disturbing the
    LDR wiring - just extending the LED connection. That
    will work fine.

  3. Guest

    Thanks Ed, my description must be poorly.
    I want to extend the wiring of both. The LEDs must be inside the
    house, and the PV panel and LDR outside for the sunlight/ambient
    The extension will hopefully be around 2 or 3 feet, and I have some
    1mm^2 figure 8 if that will be suitable, if not grossly
    over-engineered :)
    What I want to know is if there is something special about the LDR
    wiring. Why the baggy pyjamas? Thanks, jack
  4. cdd

    cdd Guest

    May not have anything to do with your application but I use a lot of
    different light dependent resistors on
    the gun burners I work on at work-(heaters used for -grain dyers/
    houses-small flame throwers etc etc) I
    have found that extending the LED will be no problem as long as you
    use the right AWG wiring size
    but the LDR is sometimes a little difficult as this is susceptible to
    induced resistance by small wiring
    diameter and outside influences like eddy currents from other cables
    if near the cable running the LDR.
    Sometimes the power supply wire running to the LDR is resistor wire it
    self -up to 1k ohm but this is
    not the norm. I think it should be ok but if it don't work try using a
    shielded cable to connect the LDR.
    remember there is only a couple of milliamps running through this part
    of the circuit
  5. ehsjr

    ehsjr Guest

    You don't need to disturb the LDR. Unsolder the LEDs
    from the board. Put wires in the place the LEDs were,
    noting polarity. Bring the other end of the wires
    to the place where you want the LEDs. Solder the LEDs
    to a new PC board like this one:

    If you must move the LDR, there is nothing special
    about the wiring.

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