Not able to upload code onto arduino mega

Im a beginner and i dont really know what this error means.
heres the error message when i try to upload code

Arduino: 1.8.15 (Mac OS X), Board: "Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)"

Sketch uses 1536 bytes (0%) of program storage space. Maximum is 253952 bytes.
Global variables use 9 bytes (0%) of dynamic memory, leaving 8183 bytes for local variables. Maximum is 8192 bytes.
/private/var/folders/rn/ldj99x197y9dxs3qvmxdw8f40000gq/T/AppTranslocation/A56C23E2-4164-41D3-A4C9-BD605CF31820/d/Arduino.app/Contents/Java/hardware/tools/avr/bin/avrdude -C/private/var/folders/rn/ldj99x197y9dxs3qvmxdw8f40000gq/T/AppTranslocation/A56C23E2-4164-41D3-A4C9-BD605CF31820/d/Arduino.app/Contents/Java/hardware/tools/avr/etc/avrdude.conf -v -patmega2560 -cwiring -P/dev/cu.usbserial-14220 -b115200 -D -Uflash:w:/var/folders/rn/ldj99x197y9dxs3qvmxdw8f40000gq/T/arduino_build_953245/Blink.ino.hex:i

avrdude: Version 6.3-20190619
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch

     System wide configuration file is "/private/var/folders/rn/ldj99x197y9dxs3qvmxdw8f40000gq/T/AppTranslocation/A56C23E2-4164-41D3-A4C9-BD605CF31820/d/Arduino.app/Contents/Java/hardware/tools/avr/etc/avrdude.conf"
     User configuration file is "/Users/lego/.avrduderc"
     User configuration file does not exist or is not a regular file, skipping

     Using Port                    : /dev/cu.usbserial-14220
     Using Programmer              : wiring
     Overriding Baud Rate          : 115200

avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_ReceiveMessage(): timeout
avrdude: stk500v2_getsync(): timeout communicating with programmer

avrdude done. Thank you.

An error occurred while uploading the sketch

I'm not a Mac user. Does /dev/cu.usbserial-14220 disappear when you disconnect the Mega? If not, /dev/cu.usbserial-14220 is not the Mega.

Screen Shot 2021-07-10 at 7.51.03 PM
it doesn't disappear but im pretty sure thats the port because the error says no board exists in the other ones

Are you using a USB cable that can transfer data or one that is only for power? Check with a different USB cable. Is the yellow light blinking when you plug in the Arduino? Is the power light on?

the power light is on the other one blinks for like a second and stops

What happens, if you double press the reset button?

If double pressing doesnt get you the blinking light back and enables an upload, try this:

Unplug the adruino
Connect RX and GROUND
Plug in arduino
Upload new program
Unplug arduino
Remove RX to GROUND connection

Does the L led (I assume that that is the other one) flash a couple of times in quick succession?

That trick is for boards with native USB; the Mega is not in that category.

yup the l led blinks like twice and goes off

So the main processor seems OK, the few flashes are from the boot loader. What does your operating system think about the board? I'm not a Mac user so don't know how to check.

What is the chip closest to the USB port? A square one with legs at all sides or a rectangular one with legs at two sides. The former would be a 8U2 or 16U2, the latter a CH340 or FTDI232. For the 16U2, 8U2 and (probably) the FTDI, you can run the loopback test; see https://forum.arduino.cc/t/loop-back-test-instructions/73046; the loopback test will fail with the CH340 so is not conclusive.


umm so this is how it looks. What should i do ?

I don't know anything about that type of board; it's definitely not a Mega but a Mega with WiFi. You will have to read the documentation regarding the dipswitches.

I've no personal experience with the Mega+WiFi, but from a little I read on it, there are some DIP switches that route serial signals around to the board.

Your board looks similar to this one. Scroll down to the details section of that web page and it shows the DIP switch settings to route the serial signals.

so i followed the instructions and now my l light is finally blinking but i still cant seem to upload code
i get this error
since im kinda new does this mean my code didnt get uploaded ?

Arduino: 1.8.13 (Mac OS X), Board: "Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)"

Sketch uses 3604 bytes (1%) of program storage space. Maximum is 253952 bytes.
Global variables use 260 bytes (3%) of dynamic memory, leaving 7932 bytes for local variables. Maximum is 8192 bytes.
/Applications/Arduino.app/Contents/Java/hardware/tools/avr/bin/avrdude -C/Applications/Arduino.app/Contents/Java/hardware/tools/avr/etc/avrdude.conf -v -patmega2560 -cwiring -P/dev/cu.usbserial-1410 -b115200 -D -Uflash:w:/var/folders/rn/ldj99x197y9dxs3qvmxdw8f40000gq/T/arduino_build_892486/FD9ONTNJZN5COM3.ino.hex:i

avrdude: Version 6.3-20190619
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch

     System wide configuration file is "/Applications/Arduino.app/Contents/Java/hardware/tools/avr/etc/avrdude.conf"
     User configuration file is "/Users/lego/.avrduderc"
     User configuration file does not exist or is not a regular file, skipping

     Using Port                    : /dev/cu.usbserial-1410
     Using Programmer              : wiring
     Overriding Baud Rate          : 115200
     AVR Part                      : ATmega2560
     Chip Erase delay              : 9000 us
     PAGEL                         : PD7
     BS2                           : PA0
     RESET disposition             : dedicated
     RETRY pulse                   : SCK
     serial program mode           : yes
     parallel program mode         : yes
     Timeout                       : 200
     StabDelay                     : 100
     CmdexeDelay                   : 25
     SyncLoops                     : 32
     ByteDelay                     : 0
     PollIndex                     : 3
     PollValue                     : 0x53
     Memory Detail                 :

                              Block Poll               Page                       Polled
       Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
       ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
       eeprom        65    10     8    0 no       4096    8      0  9000  9000 0x00 0x00
       flash         65    10   256    0 yes    262144  256   1024  4500  4500 0x00 0x00
       lfuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
       hfuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
       efuse          0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
       lock           0     0     0    0 no          1    0      0  9000  9000 0x00 0x00
       calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00
       signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

     Programmer Type : Wiring
     Description     : Wiring
     Programmer Model: AVRISP
     Hardware Version: 15
     Firmware Version Master : 2.10
     Vtarget         : 0.0 V
     SCK period      : 0.1 us

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.02s

avrdude: Device signature = 0x1e9801 (probably m2560)
avrdude: reading input file "/var/folders/rn/ldj99x197y9dxs3qvmxdw8f40000gq/T/arduino_build_892486/FD9ONTNJZN5COM3.ino.hex"
avrdude: writing flash (3604 bytes):

Writing | ################################################## | 100% 0.64s

avrdude: 3604 bytes of flash written
avrdude: verifying flash memory against /var/folders/rn/ldj99x197y9dxs3qvmxdw8f40000gq/T/arduino_build_892486/FD9ONTNJZN5COM3.ino.hex:
avrdude: load data flash data from input file /var/folders/rn/ldj99x197y9dxs3qvmxdw8f40000gq/T/arduino_build_892486/FD9ONTNJZN5COM3.ino.hex:
avrdude: input file /var/folders/rn/ldj99x197y9dxs3qvmxdw8f40000gq/T/arduino_build_892486/FD9ONTNJZN5COM3.ino.hex contains 3604 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 0.47s

avrdude: verifying ...
avrdude: verification error, first mismatch at byte 0x0884
0x10 != 0x90
avrdude: verification error; content mismatch

avrdude done. Thank you.

the selected serial port
does not exist or your board is not connected

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

i tried the blink code and the l light started blinking but then as you can see above it says port not found so im kinda confused on whether i have uplaoded my code ?

This discussion may help you out.

Ignore this bit below - i'm talking garbage!
One thing that I see, and maybe that's the way you are supposed to upload to your board, is that your setup is programming the 2560 using AvrDude. Again, I don't know this particular board, or how it's setup in the Arduino IDE, but I would have thought that the pre-loaded bootloader in the 2560 (assuming there is one) would be used just like on the basic UNO boards.

It looks like AvrDude is programming the 2560 but then the verification of the uploaded code fails, and after that the USB serial port disconnects.

It may also be worth looking around to see if there are any Youtube videos on getting started with this board just in case you've got a setting wrong.

ive gotten the settings correct. it seems as though its just a regular board with the esp module strapped onto it. i tried changing the serial but nothing works . In theory routing the signals using the dipswitches should allow it to function solely as an arduino mega but in practice i cant seem to upload code
literallly every tutorial on the web for this board is for using the esp module. No one specifies how to use it as an arduino board

and is the l light supposed to blink ?

The L light of a standard Mega blinks when it comes from the "factory". This is the pre-loaded blink sketch. I don't see a reason why your Mega+WiFi should behave different.

Re my reply #17, please ignore some of that. I just paid attention to my own IDE output (for a different board) and that also uses AvrDude to load the compiled sketch into memory.

Here's another thing to try. If you load up the example sketch in the IDE called "Blink Without Delay" (it's in Examples -> 02.Digital) and upload that to your 2560, does it also give a verification error?

If it does, does it say this:

avrdude: verification error, first mismatch at byte 0x0884

If it does, then I wonder if the internal flash memory is bad at that specific address.