Leonardo won't connect after attempting LED tutorial

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everyoneisugly
 
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Joined: Tue Jan 14, 2014 11:27 pm

Leonardo won't connect after attempting LED tutorial

Post by everyoneisugly »

I was able to successfully tinker with the RGB LED tutorial (http://www.adafruit.com/blog/2012/11/30 ... s-arduino/) using a Leonardo in place of the UNO listed. However, my Macbook is now unable to detect my Leonardo when I connect via USB. There's no option to select either USB port under the Serial Port menu and it doesn't appear in my System Report either. The green power light and the L light both light up when plugged in.

I have a second Leonardo which is working fine using the same USB cord, so that doesn't seem to be the problem. I've also tried rebooting my laptop and reinstalling the arduino ide. Is there any way to salvage this board or is it a goner?

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adafruit_support_mike
 
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Re: Leonardo won't connect after attempting LED tutorial

Post by adafruit_support_mike »

It sounds like the bootloader on your Leonardo has gotten corrupted.

The ATmega32u4 (used in the Leonardo) handles USB communication within the main chip, so it doesn't have a separate USB interface like an Uno. On the plus side, the Leonardo can pretend to be an input device like a keyboard. On the minus side, if the bootloader gets messed up it won't communicate with your computer any more.

You might be able to fix it by reflashing the firmware. This thread has information on how to do that: http://forums.adafruit.com/viewtopic.php?f=25&t=31721

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