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Thread: AdaFruit Medium 16x32 RGB LED matrix panel

  1. #1
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    AdaFruit Medium 16x32 RGB LED matrix panel

    Hallo Teensy-Friends,

    Is it possible to connect the Adafruit Medium 16x32 RGB LED matrix panel as directly and as easily to the Teensy 4.0 as it was for the Arduino Uno, including the software library part (small changes are possible, if described how).

    https://www.adafruit.com/product/420

    On the Adafruit website It is very clearly described how to configure everything, step by step, but just for the Arduino.

    Now I want to change from Arduino Uno to Teensy 4.0 and I am asking myself if I can just swap some cables and keep the software mostly as it is?

    Here are my first attempts on Arduino Uno using

    1. 8x8 SPL connected MAX7291 Red LED Matrix

    https://www.youtube.com/watch?v=4MMHFrALTSo

    2. 16x32 Adafruit RGB Matrix

    https://www.youtube.com/watch?v=6vWyOsOmmhk

  2. #2
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    I don't think you can connect it directly; the board wants 5V signals and the T4 runs at 3.3V. You'd need something like this https://www.adafruit.com/product/1902 with some pin modifications here: https://forum.pjrc.com/threads/60337...martLED-shield.

  3. #3
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    Perfect. I already thought that, but was missing this product. Thanks a lot! Have a nice day!

  4. #4
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    Is this LED-Matrix Shield available directly for Teensy 4.0 instead of the shown compatibility to Teensy 3.2 or 3.6?

  5. #5
    This is the manufacturer. It doesn't look like they have a Teensy 4 version yet. https://docs.pixelmatix.com/SmartMatrix/index.html

  6. #6
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    I guess if I just use a WS2812 Led-Strip to build my own matrix, it is simpler to use the SPI bus and a 3.3 to 5 V level shifter.

  7. #7
    Senior Member+ MichaelMeissner's Avatar
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    I recall seeing a Teensy 4.0 port for SmartLed, and I tracked it down to:

  8. #8
    I'm currently working on the software side to get the SmartMatrix library working with T4.0/T4.1. I'll update that other thread once I have some progress. The existing Pixelmatix shield is the best way to make the electrical connections to an LED matrix panel but because it's designed for T3.x there are some extra jumper wires you need to solder to T4.0.

    It should be possible to create a new shield designed for T4.0/T4.1, which would "just work" without any soldering needed... Stay tuned!
    Last edited by easone; 05-06-2020 at 07:12 PM.

  9. #9
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    It could be, that purchasing a teensy 3.6 would be a better idea, because since it is longer in the marked, it is more established and more accessories and extensions are available. The speed benefit in comparison to my current Arduino Uno would be already big enough.

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