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A fist full of LEDs for Christmas - Page 3 — Parallax Forums

A fist full of LEDs for Christmas

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  • RaymanRayman Posts: 14,817
    edited 2008-02-13 19:29
    Maybe this would be a basis for an easy 8x8 array?· I had to take this flashlight from Geeks.com apart because it came with a broken wire...

    Post Edited (Rayman) : 2/13/2008 7:38:07 PM GMT
    100_1137.JPG
    2560 x 1920 - 1M
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    2560 x 1920 - 725K
    100_1141.JPG
    2560 x 1920 - 788K
  • ClemensClemens Posts: 236
    edited 2008-02-13 21:40
    Looks promising. wink.gif But these leds probably need more than 20mA, so they can not be plexed directly from the prop's pins, I guess...
  • RaymanRayman Posts: 14,817
    edited 2008-02-13 23:13
    You might be right... I wish I'd measured the current when I had it open...
  • Fred HawkinsFred Hawkins Posts: 997
    edited 2008-06-15 02:46
    Found two interesting chips today. The first is from TI:
    TI datasheet said...
    description
    The TLC5920 is an LED driver incorporating a 16-channel shift register, data latch, and constant
    current circuitry with current value control and 8-channel common driver into a single chip. The
    constant output current is capable of 30 mA for 16 bits simultaneously, and the current value can be
    set by one external register. This device also includes a 16-bit segment driver and 8-bit
    common driver; therefore, the monocolor LED array with 16
  • Timothy D. SwieterTimothy D. Swieter Posts: 1,613
    edited 2008-06-15 07:14
    There are several LED driver chips. I use the TLC5940 from TI in my LED applications. I have driver boards for the chips for sale at www.brilldea.com.

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Timothy D. Swieter

    www.brilldea.com·- uOLED-IOC, RGB LEDs, TLC5940 driver PCB
    www.tdswieter.com
    One little spark of imagination is all it takes for an idea to explode
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