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Electronics The choice of LED driver to control the RGB LEDs

Discussion in 'Modding' started by FastCat, 6 Sep 2011.

  1. FastCat

    FastCat New Member

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    Help me choose a LED driver to control the RGB LEDs (common-anode, not super bright).
    There is an array (12 to 12) from the RGB LEDs.
    General anodes are connected together.
    The result is a common anode and the withdrawal of 144 of each color (R, G, B).
    That this matter be dynamically controlled.

    I still find only those - MY9221 and TLC5971 for the implementation of the topic (but am not sure that they fit me).

    But perhaps there are other options ?
     
  2. sammo1999

    sammo1999 New Member

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    Hey,

    The TLC5971 will work well for 16 channels providing they are indeed common anode. It will not work for common cathode.

    If you have a 12 x 12 RGB LED Matrix that means you will need a minimum of 36 PWM lines (12 x 3). So you can use 3 TLC5971s and digital lines with MOSFETS to control the rows. I would go with a fast microcontroller so you get a reasonable update rate.

    Did you build or buy the 12x12 RGB Matrix? I havn't been able to find a common anode RGB LED Matrix at a resonable price.

    -Sammo1999
     
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  3. FastCat

    FastCat New Member

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    I do 12x12x12 RGB Led Cube.
    Which is already fully assembled.

    [​IMG]

    It remains to consider an electronic circuit for my cube. But for me it was challenging, knowledge is not enough.
    So I ask here .....
     
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  4. mvagusta

    mvagusta Did a skid that went for two weeks.

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    WOW, that's awesome :jawdrop:
    Did you buy or build that?
    And what's the goal here, are you trying to make some sort of hologram effect?
     
  5. FastCat

    FastCat New Member

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    This RGB Led Cube I had soldered.
    A light effects from it will be the same as the other rgb led cube. Video examples on the internet a lot.
     
  6. sammo1999

    sammo1999 New Member

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    Yikes!

    How much did it cost for the 1728 LEDS?

    To control this with PWM it would probably be best to be able to control an entire row at a time (one 12 x 12 plate). This means 144 RGB LEDS which would is 144*3 = 432 individual LEDs. This means you would need 432/16 = 27 TLC5971s. This is going to be a nightmare to setup and you will still need a beefy microcontroller to control the TLC5971s.

    You might want to consider using an FPGA such as the Spartan 3. Sparfun has a breakout or you could design your own PCB around one. (http://www.sparkfun.com/search/results?term=spartan+3&what=products)

    You might want to start with a small 2x2x2 or 3x3x3 cube to play around with control methods before you buy the stuff for the monster 12x12x12 unit.

    -Sammo1999
     
  7. FastCat

    FastCat New Member

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    All LEDs have cost me 760$.

    The Internet already is ready to build the circuit RGB Led Cube 4x4x4 form and 8x8x8.
    And I wanted to do something even greater :)
    But obviously in this case have namuchalis with the development of an electronic circuit. Since want to do a minimal amount of chips that will control the LEDs.
     
  8. FastCat

    FastCat New Member

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  9. FastCat

    FastCat New Member

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