Hello,
I was using my arduino board mounted on the circuit as the picture. My board was recognized by the PC and I could upload my code normally. However I tried to upload my program yesterday and there was an error in loading. Then I have the green led on my arduino which is fixed and my card is not recognized by my computer.
I tried to reset my arduino pro micro by connect RST and GND pin but nothing happened.
Have you ever had this problem?
Thank you
That is the RX or TX led. It is possible to write a sketch that makes the Pro Micro to be no longer recognized, when writing too much data to the Serial port.
Try pressing the reset button twice and upload a simple blink sketch.
If that works, then show us your sketch that caused the problem.
You will need a double reset to invoke the bootloader as mentioned by @Koepel; with a button, it would be a double-tap on the reset button.
Which Operating System are you using? In Windows you can monitor the behaviour of a Pro Micro in Windows device manager.
On a Pro Micro ?? 
Oops, no button. With a wire to GND a double tap on the RST pin, I suppose ?
The other option is to burn the bootloader with a programmer (such as USBasp).
Yep
Thank you all for your answer.
I use macbook pro ...
Yes i did that but nothing happened.
I will try to find how to burn the bootloader on pro micro.
It's strange that the arduino is not recognised by the computer just after uploading a script.
Thank you for your help
This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.