Im using a Multiplexer to read multiple Potentiometer to do things with it. Ive come far enough with prototyping boards and made sure all connections are working and I get the data I need. With these prototyping boards, where I put them in without soldering, it works flawlessly.
Now I need to solder them and here is my problem: I soldered these Multiplexer 6 times, each with a unique Multiplexer and unique solding Boards and cables, so nothing was reused to make sure i dont use components that got broken. All cables, each time before soldering, were tested. No unwanted bridges were soldered. But every time I was done, one potentiometer changes values of channels, where its not connected to. This means, with my 8 Potentiometer, 1 Potentiometer changes like 5 values. However, logically, one potentiomer should only change the value of its own channel.
So i thought maybe its because the Multiplexers get destroyed somehow each time when I solder them. Okay, so ive bought this and soldered that and then later put the Multiplexer in. Same result. I have no clue why it does that and im frustrated. Again: my program works when its on prototyping boards and values are correct, but not when I solder them. Where could be the problem? And as said, connections are good soldered and there are only connections where i want them to be.