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how can I upload a hex file to an arduino uno?

I have a Rostock Max 3d with an Arduino Uno as the controller. The OEM has a firmware version I would like to upload, but it is in the hex file format.

I have looked all over the Arduino IDE, but did not found a way to upload a hex file to the Arduino. I tried using AVRDUDE, but the Arduino only communicates with my PC when I set the "Programmer" to AVRISP. I have uploaded other codes for blink, and hello_world, but haven't been able to compile the firmware source. I was hoping I could just use the hexfile included in the firmware package.

My OS is Linux.

Answer*

I found the definitive answer to this.

1. Start Arduino IDE
2. To to File...Preferences...
3. Turn on Show verbose output during: [X] upload (image 1 below)
4. Upload a sketch to your Arduino Uno
5. I used the sample blink sketch and saw the following (image 2 below):

**AVRDude: is used to upload**

You want that first line shown in white --- when you expand it you'll see that it is the entire line of code that is used to upload the HEX file of your program to the Uno.

The entire command on my computer looks like the following:

 C:\Users\<username>\AppData\Local\Arduino15\packages\arduino\tools\avrdude6円.3.0-arduino17/bin/avrdude -CC:\Users\<username>\AppData\Local\Arduino15\packages\arduino\tools\avrdude6円.3.0-arduino17/etc/avrdude.conf -v -patmega328p -carduino -PCOM3 -b115200 -D -Uflash:w:C:\Users\<username>\dev\arduino\STK2UPDI\build\blink.ino.hex:i

I'm going to break this down into a few lines:

First, it's the full path to the avrdude exe. 
Then it is passing the -C argument with the full path to the `avrdude.conf` file
 
`c:\longpath\avrdude -C C:\avrdude.conf`

Then a bunch of params to set up avrdude properly:
`-v -patmega328p -carduino -PCOM3 -b115200 -D -Uflash:w:`

And finally the full path to the HEX file you want to upload

`c:\longpath\blink.ino.hex:i`

**All You Have To Do**

All you have to do is take that extremely long line and replace the full-path to the hex file to be your target HEX file and then run the entire command and you'll see something **like what is shown in image 3 below**.

**Image 1**

[![verbose output][1]][1]

**Image 2**

[![upload info][2]][2]

**Image 3**
[![upload success][3]][3]


 [1]: https://i.sstatic.net/7zllb.png
 [2]: https://i.sstatic.net/hykpi.png
 [3]: https://i.sstatic.net/O7KUL.png

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neat, I'll check that out. what version are you using?

j0h
– j0h

06/29/2021 21:37:32
Commented Jun 29, 2021 at 21:37
using Arduino IDE 1.8.15 👍🏽

raddevus
– raddevus

06/29/2021 22:41:56
Commented Jun 29, 2021 at 22:41

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