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LDR's to read Positioning Wheel

Discussion in 'General Electronics Discussion' started by TehMaxwell, Apr 26, 2015.

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  1. TehMaxwell


    Mar 21, 2015
    Hey all,

    I was just wondering if anyone has any experience with using LDR's to read the positioning wheels that can be used to locate sections on a disc. They look like this:
    I was thinking of using one to help position a wheel that is spun with a dc motor. Black is 1 and White is 0. This way you can have individual byte arrays for each column of the wheel, so you can say which array you want to go to, and the wheel will spin until it reaches that section. I was thinking of attaching it to a disc that would hold router end mills, so that you could have an automatic dispenser for all of your bits and mills. You could possibly use an arm mechanism to place it into the chuck of your router or rotary tool.

    Thanks very much,

  2. mofy


    Dec 19, 2014
    LDR's are not the right component for this. They tend to be large area (relatively) and unfocused, no optics. For such a coded disc you would be better off with perhaps optical switches, or a linear detector array with illumination.
    davenn likes this.
  3. Tha fios agaibh

    Tha fios agaibh

    Aug 11, 2014
    Why not just use an encoder?
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    The OP is essentially building his own encoder. The image is from the respective Wikipedia page.

    I agree. You'd use photodiodes or photoransistors for this purpose.
  5. TehMaxwell


    Mar 21, 2015
    Thanks for the tips guys! Ive never used those components before so it would be good to get some experience with new stuff.
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