Hi Everyone, Brand new to Arduino. Wanting to use a Uno in a test fixture. Intent is to send simple commands from a PC and let the Uno set or clear some IO pins.
The Serial Event example (from File->Examples......) seemed like a good starting point. I tried the example code and it worked! But... if I make some minor change to the code and re-load I get errors that say the COM port is busy (COM5). I have tried to power the Uno down and back up but the COM port is still unavailable. The only way I've found to try the modified code is to completely re-boot the PC and then reload.
Can someone tell me what I need to add to the example code to allow it to use the COM port after making changes? I've searched Google for an answer but can't find one that works.