avrdude: stk500_getsync(): not in sync: resp=0x00

Development Tools IDE 1.x
1

I recently just bought the Arduino Uno. I am using Windows 7.

After trying to upload the "blink" program, I am getting the following error:
avrdude: stk500_getsync(): not in sync: resp=0x00

I have looked all around the web on this and understand that it is some type of serial port problem. I have done the following things:

  1. Uninstall and re-install Arduino IDE
  2. In Arduino IDE: Tools --> Board --> Arduino Uno
  3. In Arduino IDE: Tools --> Serial Port --> COM7
  4. In my device manager, I can see my "Arduino Uno (COM7)" under PORTS (COM & LPT)

I don't know what else could be the issue.

2

http://forum.arduino.cc/index.php?topic=73748.0
Pass or fail?

3

Fail. What I send was not echoed back.

4

Have you ever been able to upload to the Uno?

5

Yes, I was able to upload the Uno for quite a while. I was using COM4.

The only thing I can remember doing to it was disconnecting the USB while one of my systems was running. This doesn't seem like it should effect anything, but I started getting the "avrdude: stk500_getsync(): not in sync: resp=0x00" error immediately afterwards.

After this instance, the Arduino IDE quit recognizing that I had any serial connection (the "Serial Port" menu under Tools was grayed out). Since then, I have uninstalled and reinstalled the latest IDE and my Arduino is now attempting to interface with COM7.

6

The ATmega16U2 may have forgotten its purpose. If you have a second board I suggest trying to re-flash it.

7

Panther25423:
Yes, I was able to upload the Uno for quite a while. I was using COM4.

The only thing I can remember doing to it was disconnecting the USB while one of my systems was running. This doesn't seem like it should effect anything, but I started getting the "avrdude: stk500_getsync(): not in sync: resp=0x00" error immediately afterwards.

After this instance, the Arduino IDE quit recognizing that I had any serial connection (the "Serial Port" menu under Tools was grayed out). Since then, I have uninstalled and reinstalled the latest IDE and my Arduino is now attempting to interface with COM7.

Let me know, last program being uploaded by you. I think your boot loader has been crashed. You might uploaded infinite loop program.
Also check whether any error or not. As you telling intially port being showing 4 and now it showing 7 . It bit confuses here.

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