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USB -> Unknown Device (Nano V3.0 + DFRobot I/O Expansion

userHead pchalermwat 2011-04-28 08:39:14 7184 Views4 Replies
Hello Please Help!!,
I've got my new Arduino Nano V3.0 and it works fine alone. My computer recognizes it when connect to USB port. But when I snap the Nano to DFRobot I/O Expansion (Roboduino Nano Expansion) 2009 the computer reports "Unknown Device" when trying to connect it via USB cable. I appreciate any suggestions/work around.
Thanks,
--PC
2011-05-10 23:25:27 Some cables have big resistance than others. It will down the USB voltage to 4.5  which is not sufficient to power the Arduino.

userHeadPic R2D2C3PO
2011-05-03 17:54:48 Thanks Admin. It works with my old cable but not the supplied one.  Any explanation?  What could be possibly wrong? userHeadPic pchalermwat
2011-05-01 02:29:40 Nothing on the I/O board.    I also try various combination of jumpers on the board but wouldn't help. I'll try another USB cable as per your suggestion. Thanks for your feedback. userHeadPic pchalermwat
2011-04-30 01:15:25 Do you have anything that attached on your IO board?

And, one good tip is to try another USB cable. We found the cable do influence something sometime.
userHeadPic R2D2C3PO