LT Releases a "Tiger" like RGB driver board... not DMX but SPI driven

Discussion in 'Computers, Cabling & Other Miscellaneous Hardware' started by dmoore, Jul 3, 2010.

  1. dmoore

    dmoore http://www.HolidayCoro.com

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    LTech (which makes the 6803 driver box that has been tested here in another thread) has released what is kind of like a Tiger 120 board - sans the DMX and is only 96 channels. To drive it with DMX, you need on of their LT-8020 driver boxes. Here is a diagram showing hookup:

    [​IMG]

    Here is the website:
    http://www.ltech.cn/english/product/LED-RGB-Driver.html

    Here is a US seller of the item:
    http://www.usledsupply.com/shop/rgb-32-spi-dmx-decoder.html


    So, what exactly is "SPI" as a communications protocol?
     
  2. dmoore

    dmoore http://www.HolidayCoro.com

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    Here is the price list that goes along with it. Ray Wu can order items directly from LT if you are considering any samples.
     

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  3. AussiePhil

    AussiePhil Dedicated Elf Administrator

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  4. dmoore

    dmoore http://www.HolidayCoro.com

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    Anyone know anything about SPI as a communications protocol? Can MPH's do SPI?
     
  5. TimW

    TimW Full Time Elf

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    It depends a lot on how the boards work.....

    SPI is a way of getting data from the DMX interface to the controller. The SPI stream could contain a series of greyscale levels that might be latched into the controller.. which then continues to output signals at that dimming level all by itself until the next set of values is received. In this case the controller is just a 'multi pixel' and should be able to be driven by MPH or other converters pretty easily (better to ask MPH that question though!)

    OR.. the SPI could be just telling each channel to turn on or off... the 'dimming' would be derived by how much of the time each channel is on vs how much time it is off. This requires a lot more effort from the DMX interface (because it has to tell each channel whether its on or off hundreds of times a second....). In this case the controller would be little more than a GRINCH (see DIYC)..

    Hard to tell just by looking (without knowing the chips on the controller).
     
  6. Tabor

    Tabor Full Time Elf

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    The 6803 and 2801 pixels get their control from an SPI interface.
     
  7. n1ist

    n1ist New Elf

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    SPI is a serial bus where you have a clock, a data out pin (from the master to the slaves, often called MOSI - master out, slave in), a chip select, and an optional data in pin (MISO - master in, slave out). The nodes on an SPI bus are basically shift registers where the data out pin from one is connected to the data in pin of the next.
    So you set chip select low, clock in "n" bits of data to load all the shift registers, and then set chip select hi to latch the data.

    The real key, as TimW said, is what the nodes do with the data. They could use the data to set the intensity, or it could be up to the master to do the PWM and shift out the data fast enough.
    /mike
     
  8. dmoore

    dmoore http://www.HolidayCoro.com

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    It occurred to me that this "tiger" like board, being SPI driven could be run with a TP3212.

    The
    [​IMG]

    Here is the updated link: http://www.ltech.cn/english/product/SPI-Driver.html

    96 channels for $35 is a fairly good deal for $96.

    Attached is a price list they sent me.
     

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