Hey Bill,
thank you for your support again!
I doubt it’s the power supply, I’m using a Samsung 5v/2.0A USB power supply. I should hope 2 amps is enough… right?
Double power supply would be very cumbersome obviously. But, could I use the same USB based PSU but bypass the arduino?
Right now I feed in to the USB port of the arduino and I have the 5v of arduino connected to my 5v circuit. could it be that somehow the output of the 5v rail on the arduino is not sufficient and that splitting of the 5v of the PSU and directly supplying that to the 5v circuit on my pcb would do the trick? In such a case, could I still also leave all the pins connected to the arduino USB, basically supply the same 5v source through 2 separate channels?
roughly something like this:
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(I’ve removed the keypad connector from the drawing since it doesn’t influence this issue and got in the way for a quick sketch…)|](image hosted at ImgBB — ImgBB)