Hello Friends
I am having problems when I connect the usb cable with my arduino leonardo. I used it all day and had even uploaded some sketches, now it seems to be stuck. When I plug it into the usb it doesn't recognize the arduino instantly, it only recognizes the arduino when I press the reset button, it stays connected with windows for a few seconds and disconnects, as if I unplugged the usb cable.
Has anyone experienced this same problem ?
Thanks
The 32U4 processor has integrated USB-serial functionality. It's possible to "brick" it with a rogue sketch. Luckily there is a standard procedure to unbrick it, I believe it is documented somewhere on this site. Maybe the product page?
Indeed, it has to do with pressing the reset button immediately before uploading... it may take a few tries to get the timing right. Once you can upload an empty sketch, the USB bootloader is restored and you can upload any sketch.
Thanks buddy, it worked!
In the short time that it recognized in windows, I loaded the blink and it was back to normal.
Been there, done that. 
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