I have a project that I have developed on a UNO but as I’m wanting to compact the physical size so I tried running it on a ProMicro.
Code previously developed on UNO downloads & runs OK while ProMicro is connected to IDE but when I disconnect this now programmed ProMicro to another port or external power pack of the correct voltage the code won’t run.
To simplify the debugging I downloaded ‘Blink’ to the ProMicro and it runs fine flashing the inbuilt LED but when I take this now programmed ProMicro and plug it into another USB code won’t run.
Linking the ProMicro normally internally held HIGH Reset pin to Ground won’t reset. Could be that USB serial port no longer connected ??? Don’t know ???
Any help appreciated ???