Color sensor distance problem
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  1. #1
    Join Date
    Sep 2008
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    Default Color sensor distance problem

    Hi,

    I want to detect three colors(RGB) by using a circuit.I tried LDR and three leds(red,green,blue) but they are not sensitive.For example I can not detect colors more than 5 cm away.It should detect at least 10 cm away from LDR.

    What do you suggest?Should I use other thing?

  2. #2
    sinoteq's Avatar
    sinoteq Guest

    Default Why not?

    Hi,
    Test one of these, not that bad price and is made for detecting colour.
    TCS230 from TAOS.

  3. #3
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    Sep 2008
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    Default

    this is my circuit.I used two blue leds one for red one for green.Black thing in the middle is LDR.How can I increase the sensibility(range of measurement)????



  4. #4
    skimask's Avatar
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    Quote Originally Posted by burak450 View Post
    this is my circuit.I used two blue leds one for red one for green.Black thing in the middle is LDR.How can I increase the sensibility(range of measurement)????
    Lenses? Collimator?

  5. #5
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    Default

    Quote Originally Posted by burak450 View Post
    this is my circuit.I used two blue leds one for red one for green.Black thing in the middle is LDR.How can I increase the sensibility(range of measurement)????


    Ambient light sensitive photo diode is the way to go.

    Many different versions available in the market, arkadaşım.


    ------------------------
    "If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte

  6. #6
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    Default

    Hi burak450,
    I scrapped out a video camcorder once, it had a unit composed of 3 chambers, 3 colored filters and 3 light sensors, presumably used for color correction, the filters were as you might have guessed red blue green. This unit was mounted on the front top of the camera above the lens.
    If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
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    Gold is the money of kings, silver is the money of gentlemen, barter is the money of peasants - but debt is the money of slaves
    Tyranny is defined when law enforcement is allowed to make the law.
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  7. #7
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    Default

    I am sorry, but I dont get most of answers.HOw can I use lenses in this project?Is there any example?

    I tried photodiode earlier.I didnt have right results.What kind of photodiode should I use? For example???

  8. #8
    skimask's Avatar
    skimask Guest

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    Quote Originally Posted by burak450 View Post
    I am sorry, but I dont get most of answers.HOw can I use lenses in this project?Is there any example?

    I tried photodiode earlier.I didnt have right results.What kind of photodiode should I use? For example???
    http://en.wikipedia.org/wiki/Collimator

  9. #9
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    Default

    Here is a crude picture of the device I mentioned.

    Name:  Collimeter.jpg
Views: 730
Size:  12.7 KB
    If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
    .
    Gold is the money of kings, silver is the money of gentlemen, barter is the money of peasants - but debt is the money of slaves
    Tyranny is defined when law enforcement is allowed to make the law.
    .
    There simply is no "Happy Spam" If you do it you will disappear from this forum.

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