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[on:]

Please help. I am using arduino uno. This one [9:31:09 PM] rubal chib: http://www.rhydolabz.com/index.php?main_page=product_info&products_id=626

I am using a cable detachable with my usb to serial for connecting it to the uno.
https://docs.google.com/open?id=0By2gprBNjzquTGVoS0J4cjR6b1E. The cable part of it.

I have windows xp. and uno driver is successfully installed https://docs.google.com/open?id=0By2gprBNjzquZUE5Z2Frb1ZsMHM

the problem i am facing is that When i tried uploading led blink sketch with correct com port selected and device too. I am not able to upload it. It gives an error:    "avrdude: stk500_getsync(): not in sync: resp=0x30"
https://docs.google.com/open?id=0By2gprBNjzquaFdDZmRoSkFxU0k
i tried re installing driver etc.
Please tell me wot probable error it could be. Wire problem? or anything else?

Also the Rx Tx pins are not blinking when i try to upload code.
Boatloader is installed cos when i press reset the L led blinks.
also i read somewhere uno doesnot have a usb port but has a unique id instead??

Please help

[Reply #1 on:]

Can you upload with verbose output enabled (in the Preferences dialog) and post the output here?

It might be an anti-virus program or firewall is preventing access to the serial port.  Or that some other program has it open already. 

[Reply #2 on:]

If your computer does not recognize the Arduino, try this:

Do not use the computer's USB power.  Power up the Arduino before connecting to the computer's USB port.  Powering-up the Arduino while at the same time connecting to the USB port does not allow the Arduino's circuitry and software time to settle to a state that will allow it to negotiate with the computer's USB port.

Whenever you get the 'not in sync' error, disconnect and reconnect the USB port.

Post a reply and tell me if this helped or not.

[Reply #3 on:]

Thanx i swicted to ubuntu and it wrked. and wenever i get this error i remove the cable and again try it wrks mostly. Will use external power if again face the same problem