Problem uploading sketches

Development Tools IDE 1.x
1

I've been doing all sorts with my Uno over the last week, but after making a few small tweaks to my latest sketch this evening, I couldn't get it to upload. I get the following error:

avrdude: verification error, first mismatch at byte 0x0000
0x0c != 0x62
avrdude: verification error; content mismatch

It won't even let me upload the standard 'blink' sketch.

I've disconnected everything from the board, tried a new USB cable in a new port, tried resetting the board immediately before uploading. Always the same error.

When I push the reset button, led 13 flashes then stays on permanently, sometimes flickering a little.

When I upload, the TX and RX lights flash, but after the error it's back to led 13 staying on.

Googling indicates either a fried board or the need to replace the bootloader.

Any advice?

Edit: it's perhaps also worth noting my MacBook has had a kernel panic and shut itself down three times today (an otherwise incredibly rare even) while doing stuff with the Uno.

2

Hello ArduinJoe,
Kindly add the details of the tweaks. Are you using a dedicated UNO board or breadboard setup with UNO bootloader?

3

Thanks for the reply.

It's a dedicated Uno R3 board - not an offical Ardiuno, one of the cheaper ones from eBay.

The only change to my code between it working and not working was to add a couple of lines to print a line of text to the LCD display:

lcd.print("====================");

I had two temperature sensors connected, the LCD display, and an LED from digital output 2 - all of which had been functioning correctly for some time before this happened.

4

Check this topic NerdKits - verification error (Support Forum). It may be a COM port issue/