Fried Arduino Nano

Forum 2005-2010 (read only) Hardware Troubleshooting
1

hi there,

i am having trouble with my arduino nano 3.0 which i power via pin30 at 9V. i uploaded some code and unplugged the usb afterwards, hooked up the 9V supply and started using it, all went well.
wanted to change some code, plugged in the USB cable but forgot to remove the 9V supply. now the nano is not responding anymore on USB.

on OSX i get those errors

USBF: 75.484 [0xd87f300] The IOUSBFamily is having trouble enumerating a USB device that has been plugged in. It will keep retrying. (Port 1 of Hub at 0x4000000)

USBF: 78.477 [0xd87f300] The IOUSBFamily was not able to enumerate a device.

it is not the ports on the computer, they are running fine, it is not the driver, i can hook up another arduino which works fine. i am running out of ideas.
i've removed the nano from the projects to rule out fuses, but still the same.
i integrated a heartbeat via pin13 so i can see if the board is running, which it is, with usb and 9V respectivly.

could i've fried my ftdi-chip with what i did? i can't find anything on the net. pin30 can handle 6-20Volts, so i am good there. but what if you have two powersupplys?
any hints? i am out of ideas ....

2

I can't see a failure mode that would involve the 9V input. My best guess is you had an ESD event on the USB lines. I don't think the Nano has any protection circuitry on these lines and connectors do tend to generate some static electricity due to friction.

So my best guess is a fried FT232.

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3

thank you for your answer, lets hope you are wrong :wink:

but what about the using two power supplys at once?

and also: is ist still possible to program the nano via an ISP if the ftdichip is dead? should be, right?

4

but what about the using two power supplys at once?

I just don't see that as a problem after looking at the schematic. Perhaps someone else can spot something.

is ist still possible to program the nano via an ISP if the ftdichip is dead? should be, right?

That should be possible. I have seen strange things, however, in which damage to an FT232 caused damage to the AVR indirectly.

--
Check out our new shield: http://www.ruggedcircuits.com/html/gadget_shield.html

5

thanks for all your help :slight_smile:

6

got the USBTinyUSB v2 and sucessfully flashed a sketch onto the nano. thanks again!