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Thread: Light sensor

  1. #1
    Variable Bitrate 4u2n's Avatar
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    Question Light sensor

    I get an idea maybe Im crazy,

    Automatic light sensor to control the light in the consol and maybe the gamma on the TFT screen

    Then the problem cam, where to put the sensor, because the sensor most only see the daylight not light from lamp on the road or other car.

    Some Idea to put the sensor and how
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  2. #2
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    place one sensor looking outside through the window and the other in the dash. Then have the sensor compare the light input from outside to light input from inside. Then write a program to adjust the light output on the screen to adjust accordingly.

  3. #3
    Variable Bitrate 4u2n's Avatar
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    Quote Originally Posted by Tred
    place one sensor looking outside through the window and the other in the dash. Then have the sensor compare the light input from outside to light input from inside. Then write a program to adjust the light output on the screen to adjust accordingly.

    how to tell the sensor looking outside it daylight og light from another car. ????
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  4. #4
    Low Bitrate gadget's Avatar
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    I would like to see that. Don't know how it would work or anything. Could you just have it located like near the lower section of the dash? Ambient light would be fairly consistant, and you would not get headlights or anything in that location. I am thinking like under and a little in front of the glovebox looking toward the passenger side floor mat.

    It would be nice to then somehow set the skin for your front end and change the settings for the screen.
    I am a newbie trying to outfit a couple cars with new custom consoles and mini ITX. Click here for my 2003 Chevy Avalanche project.

  5. #5
    Low Bitrate modUlarBeing's Avatar
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    I was thinking about doing this at some point. but the way that I understand in cars that come with light sensors to control headlights there is a delay on it. This is to prevent street lights, other cars headlights, etc from triggering it. So basically you would monitor the sensor for a couple minutes and after that if there is no change then do whatever you need to do.

    btw, most manufacturers place this sensor on the dash near or in the defrost vent.

  6. #6
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    Quote Originally Posted by 4u2n
    how to tell the sensor looking outside it daylight og light from another car. ????
    Actually it is not so hard, despite what it seems to us as basically the same brightness (car lights or day lights) in fact they vary in brightness by order of magnitudes, our eye doesn't see that because it has logarithmic scale.
    So with a circuit, correctly calibrated, it should not have any trouble distinguishing the two instances.

  7. #7
    Constant Bitrate RPI Geek's Avatar
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    Personally, I'd like to have the gamma adjust and the player change to a night skin when I tell it to by flipping a switch or press a soft button. I'm sure this is possible but I have no idea how to do it.
    Old plans out the window because of an accident .
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