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MAX7219 not working — Parallax Forums

MAX7219 not working

slimboyfatboyslimslimboyfatboyslim Posts: 6
edited 2004-09-04 11:18 in BASIC Stamp
hi,

I'm using BS2-IC with MAX7219 LED driver to drive 8x8 dot matrix display, at the beginning, it works properly but when I disconnect power and do some wiring, programming. It started to work in a wired way. I have done serveral things but I'm quite sure I've wired it correctly, I'm just wondering is it because the CLK problem or running bad data or it frys.

Using what situation, the MAX will burnt? Is there any ways to test is it working anymore?

Sorry for this abstract email, but since I've changed something that I've forgotten

Comments

  • KenMKenM Posts: 657
    edited 2004-09-01 04:59
    Does your code re-initialize the 7219 when you return power to it?

    Please post your code.

    Ken
    slimboyfatboyslim said...
    hi,

    I'm using BS2-IC with MAX7219 LED driver to drive 8x8 dot matrix display, at the beginning, it works properly but when I disconnect power and do some wiring, programming. It started to work in a wired way. I have done serveral things but I'm quite sure I've wired it correctly, I'm just wondering is it because the CLK problem or running bad data or it frys.

    Using what situation, the MAX will burnt? Is there any ways to test is it working anymore?

    Sorry for this abstract email, but since I've changed something that I've forgotten
  • jakjrjakjr Posts: 88
    edited 2004-09-02 07:37
    I suppose youre doing this on a solderless breadboard, correct?

    If so make sure no resitor leads, exposed wires, etc. are touching each other as it could cause a short which might make it stop working until the short is fixed or just burn out the chip alltogether.

    Recheck your wiring closely, make sure "everything" is done correct, make sure sure everything is making good connections, make sure nothing is touching anything else, make sure your chip is connected good. When using the breadboard built onto the BOE board ive noticed certain things dont seem to make good cennection, mainly IC's.

    And yes check your program code and post it, even though the code may execute (tokenize) fine it could have something very small wrong with it, such as a typo or wrong number, etc.

    As far as I know their innt any way to see if the chips is working porperly other than wiring up a simple test circuit, which would be no different than what your doing now.
  • gremlingremlin Posts: 6
    edited 2004-09-04 11:18
    Intermittent problems are always difficult. I build on a solderless breadboard. It might be a few minutes to check your wiring with an Ohm meter to verify continuity.
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