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Topic: LED-Matrix: Everything is mirrored (Read 178 times) previous topic - next topic


Sep 01, 2015, 11:22 am Last Edit: Sep 01, 2015, 11:47 am by Vulpecula
Hey there!

I was playing around with two 8x8 matrices, when I came across the arduino-Max72xxPanel library.

Now I've got this strange problem: When using this matrix in combination with pre-made MAX7219 boards (the ones with the little BL-whatever led-matrix already on it), everything works just fine.

But once I hook this up to my self-made matrix (with the MAX7219 sitting on a breadboard) everything is mirrored. At first I thought I had made a mistake when connecting my multiplexed matrices but as far as I can see, the hookup is just the same (compared to the pre-made ones).

The library has some features, allowing me to rotate the display but that does not work either, since it also rorates the mirroring.

Maybe someone has an idea on whats going on.


Edit1: THIS is an example of how my matrices are connected. As for now, I have two of them in a horizontal layout.

Edit2: What seems to 'fix' the problem is reversing the order of my cathodes. But then it brings up the problem, that the order of the display is also reversed. Of course I could fix this by using the libraries features but this isn't very satisfying since I really want to find out what is going on here.


place the sketch,then whe can controlled :)


Basically you have screwed up the wiring, you can either correct it by rewiring it or in the software. There is nothing "strange" about this.

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