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[on:]

So I just bought my arduino duemilanove a month ago (with the atmega 328 if that's important) and now when I plug it in to the usb the power light goes green for about half a second then fades away. I just noticed this today and the last sketch I was running was an IR sensor, which was working fine. When I connect it through an external power source it works, but not through usb. Anyone know what could be happening?

[Reply #1 on:]

I just noticed this today and the last sketch I was running was an IR sensor, which was working fine. When I connect it through an external power source it works, but not through usb. Anyone know what could be happening?

Well the USB power goes through a 500ma thermofuse before it powers the rest of the board. Perhaps you have some external component or circuit that is drawing too much current?

Perhaps you can try disconnect everthing wired to the board and load the blink program and see if the on-board pin13 LED works.

Lefty

[Reply #2 on:]

alright, took all the circuitry off and now the led stays on and the TX/RX lights blink for a second and windows says stuff about new hardware, but the arduino program doesn't see it, and  the Serial Port menu is blanked out

[Reply #3 on:]

Touch the components on your board. Anything getting hot?

It could be the fuse is current limiting, enough gets through to turn on the serial interface chip but the voltage is too low and doesn't work properly.

Just guessing here, but let's eliminate simple things first.

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[Reply #4 on:]

how long would it take to get hot?

[Reply #5 on:]

how long would it take to get hot?

Just a few seconds.

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

[Reply #6 on:]

nope, I'm not feeling anything

also, if this is important, I was using it on my linux box before, but I'm using windows right now

[Reply #7 on:]

ok, so I guess I should've read the readme first . I went through and tried to install the driver, and I go into drivers/FTDI USB Drivers/ but then the installer says "The system cannot find the file specified"

I'm going to google it, but if you have any answers to this I would really like to hear them.

*BEGIN EDIT*

I suppose it would've helped if I had searched around ...

I found this post

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1280242605/0

which fixed my problem