my usb connector is hot

i hadn't been using the arduino for some hours and I did some change to the code and clicked upload. it said that it didn't fin't the usb. it told me to check the setting but the settings couldn't find it either. i was going to plug in and out the arduino to see if that helped. when i was going to unplug it i noticed that the metal-casing-thing around the usb was really hot! is it because i hadn't unplugged it for a long time or may there be some bug in the software?

is it because i hadn't unplugged it for a long time or may there be some bug in the software?

Probably not. More likely a bug in the hardware. What is connected to the Arduino, and how?

Yeah definitely sounds bad. Where did you buy the "Arduino" from?

i found the link to the shop here http://arduino.cc/en/Main/Buy so i think it's legit.

i were using a small motor for a while, just holding two wires against it and watching it spin. maybe required a lot of electricity.

i were using a small motor for a while, just holding two wires against it and watching it spin. maybe required a lot of electricity.

Probably. The Arduino is designed to supply a maximum current of 40mA per pin, with a total of 200mA from the board.

The USB connection from the computer is designed to supply not more than 500mA.

Typically, you should power a motor using a separate power supply, with a transistor connected to a digital pin to turn the motor off or on.

The USB connector should not be getting hot if you are drawing less than 500mA of current. If the USB connector is hot and the tools don't see the IDE the USB voltage at the board is probably too low to power the Arduino.

If there are no faults on the board (or on the circuitry you've attached to the the board) there is either a bad solder joint on the USB VUSB or GND pin or there is a poor connection between the cable and the connector. The poor connection increases the resistance which increases the power dissipation producing the heat (P = I^2 * R).

A couple of things to look at --

  • Visually inspect the connector for a bad solder-joint.
  • Try swapping the cable. Before connecting the new cable visually inspect the pins.

(* jcl *)


www: http://www.wiblocks.com twitter: http://twitter.com/wiblocks blog: http://luciani.org

i'll remember unplugging it if i've got circuitry connected and not using too much current.

and if it happens again i'll try following your tips.

found the link to the shop here http://arduino.cc/en/Main/Buy

Yes but what was the store as some have been found to have sold official ones to start with and then have sold fake ones to some people.

Please say what the store was.

Mowcius

i bought it from www.lawicel-shop.se the arduino has ITA written on the top and an italian map on the back. seems legit.

Yep all looks good. I just wanted to know :)

Mowcius

http://itp.nyu.edu/physcomp/Tutorials/HighCurrentLoads