As can be seen in the attached schematic i created a simple test rick involving a Arduino Nano and som simple input cricuitry.
Its quit simple but it doenst work. The power supply delivers the correct voltages.
The Nano simple connected to a USB cable works. For testing i uploaded the 1 sec blink sketch.
But when i place the Nano into the design the program doenst run. The blue led on top lights.
Even when the power is disconected nothing happens. I am out of suggestions. I checked every track on the PCB for a short but found none.
Its even stranger that as the design was firt build on a breadboard and that functions perfect.
Arduino_Nano_V031_sch.pdf (58.5 KB)