I am trying to upload the blink example into Arduino mega,
I selected the correct board at the program but it's taking very long time to upload and it never display uploaded. Please advice
DownloadProblemMega.pdf (207 KB)
I am trying to upload the blink example to Arduino mega,
but the program keep uploading it never display uploading done,
I attached a screenshot.
Although I selected the correct board from the tools menu.
Please advice.
DownloadProblemMega.pdf (207 KB)
It is much easier for us if you post the errors as text rather than a picture. If you must post a picture it is easier if you attach it as a PNG of JPG file.
That message says "verification error: content mismatch"
I think that implies that it has partially uploaded the program but when it tried to verify that the code uploaded correctly it found problems.
It could mean that your Mega is faulty - but don't throw it in the trash just yet 
Is this the first time you have tried uploading to that board?
Do you have any other Arduino board to try?
Can you try uploading to the Mega from a different PC?
...R
Try with a different USB port. If that works, your first port is defective.
Try with a different board. If that board works, your first board is defective, or deserves a fresh bootloader.
When I upload to UNO, I have no problem,
I only experience this issue with the mega,
I will try another PC.
More answers here: http://forum.arduino.cc/index.php?topic=443527.0
I am having this issue now with another Arduino mega.
I successfully downloaded the blink example to the second board.
Then I attached the GSM shield, I pulled the male header out of pin 2 and connected a jumper wire between pin 2 and 10. I uploaded the test modem example successfully but the serial monitor screen was frozen (nothing was displayed). When I tired to upload the test modem sketch a second time, I got this error. Please advice.
Sketch uses 1,518 bytes (0%) of program storage space. Maximum is 253,952 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 8,183 bytes for local variables. Maximum is 8,192 bytes.
avrdude: verification error, first mismatch at byte 0x0000
0x14 != 0x06
avrdude: verification error; content mismatch/code]
I am uploading the blink sketch from another PC and I am facing the same error,
on two Arduino mega ??
Please advice
Detach all shields and modules, which may use the TX/RX pins. These pins can be used only after the upload of the sketch.
FutureEngineer:
Please advice
(sp. "advise")
STOP CROSS-POSTING, CROSS-POSTING WASTES TIME.
I am uploading the blink example only to Arduino mega only.
The GSM shield is not attached, but I noticed that I experienced the problem after adding the GSM shield to the board. After disconnecting the GSM shield, I am facing this issue.
Connect directly to the PC, don't use a hub.
Is it a genuine (expensive) Mega or did you get it from Ebay or Aliexpress?
Post a picture of the board showing the chips near the USB port.
How do I connect directly to the PC, without using a hub ?
It a genuine (expensive) Mega, I bought it from Sparkfun Supplier.
FutureEngineer:
Please check the picture of the Mega
You have the "Mega ADK" version.
Are you using the "Arduino Mega ADK" board type in the IDE?
(Buy "not using a hub", I mean a direct USB cable connection from the Mega to your PC. )
Yes I am picking Arduino Mega ADK" board type in the IDE.
Please advise, I am having this issue with two mega boards.
mikb55:
You have the "Mega ADK" version.
Are you using the "Arduino Mega ADK" board type in the IDE?
Yes
FutureEngineer:
How do I connect directly to the PC, without using a hub ?
It a genuine (expensive) Mega, I bought it from Sparkfun Supplier.
You use the USB cable directly from the PC USB socket to the Mega USB socket.
No HUB.
Tom..
TomGeorge:
You use the USB cable directly from the PC USB socket to the Mega USB socket.
No HUB.
Tom..
Yes.
So, the two boards are damaged.
I should throw them ??