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Topic: Problem with led matrix array (Read 1 time) previous topic - next topic


Hi all, I am pretty new at this topic and want now to use some arrays for further projects.
But now I have a problem I can't solve since yesterday.

I think there is this problem because the gnd's aren't all LOW. But why are those two led's on?
I have really no idea...

Here is the code:

And here is a pic of the result.
All resistors are the same.

Hope somebody can help me to find the mistake.


Here is the code:

So where is the schematic?


The schematic of the Matrix is really simple. There are 5 rows with 7 led each. The rows have a common gnd ant the columns have a common anode.
I use 330R resistors. Everything is connectet to the digital pins of my Arduino UNO.


Sorry that is insufficient.
It might be simple for you but I have no idea how you wired it up, so I can't spot any errors you might have made.

The rows have a common gnd ant the columns have a common anode.

That makes no sense at all.

I use 330R resistors


Maybe some one else with special powers will be able to help you.

Good luck.


Here is the schematic of the : matrix.http://www.reichelt.de/index.html?;ACTION=7;LA=3;OPEN=0;INDEX=0;FILENAME=A500%252FTA20-11_TC20-11%2523KIN.pdf;SID=13Tkv1G38AAAIAAEcVGyYb8c65e914f2b410b7bef9d95184f20c4

What do you mean with special resistors? I can light the whole matrix with those resistors. But if I want to use this array I get this problem.

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