Hi there!

As a hobbyist from Germany, I tried to start playing around with arduino boards, got bored by the blink-examples and tried something more difficult. Right now I am in the process of building a 4 line display from LED-matrix-displays (MAX7219 driven) for my woodwind band. The old one weighs approx. 20 kg and not worth or even possible repairing. The purpose of the display is to show the numbers of the next 4 songs to be prepared by the musicians on stage. It is supposed to be controlled via a custom Bluetooth app (which still has to be written). Right now I have very unstable results while testing my test build. Some of the displays simply don't want to do what I want them to do.

My workspace is divided into two parts: a workbench for soldering and assembly/disassembly of electronics and my testbench where i have my PC and do the programming stuff. Unfortunately I just have rudementary test equipment (handheld multimeter and not cheapest logic analyzer) so I'm stuck in the troubleshooting process. An oscilloscope would be really handy to probe the signal paths for faults.

Greetings from Germany.

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