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  1. #1
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    Intermittent LED's on MAX 7219

    I am having this problem with the MAX 7219 seven segment, 8digit boards. When I plug them into myArduino Mega board, +5vdc to VCC and GND to GND, the ledís light for a shorttime and than they quit working. I havethe same problem with all four boards that I have.I have also tried using the 9 volt battery withbarrel connector, same problem. The question I have is shouldnít I be able toapply voltage to the board and have the ledís light up???Or do I need to have the data, clock and theload connected also?

    deskpilot

  2. #2
    75+ Posting Member skalarki's Avatar
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    Re: Intermittent LED's on MAX 7219

    Hi mate
    MAX 7219 is a display driver controlled via SPI bus. So it will not work just like that. To get chip running it has to be properly initiated, then Data has to be clocked in. See data sheet for details. I don't know anything about Arduino but I am almost sure they provide code for it.
    MAX 7219 is 5V driven logic! Connecting 9V to the board may cause damage of chip .
    SKALARKI electronics - everything for your new A320 cockpit!
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  3. #3
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    Re: Intermittent LED's on MAX 7219

    deskpilot,

    You need to send some data to it to light the LEDs.

    ~Fess
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  4. #4
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    Re: Intermittent LED's on MAX 7219

    OK, You answered my question. Thank You

    deskpilot

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    Re: Intermittent LED's on MAX 7219

    Problem solved sodered wires, used heat shrink, all works

    Thank you again. deskpilot:

  6. #6
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    Re: Intermittent LED's on MAX 7219

    I am in the process of rewiring my Radio, soldering all connections.
    Last weekend I got about halfway done.


    ~Fess
    I will only ever be, half the Geek that I wished I was.
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