Skip to content
Switch branches/tags


Failed to load latest commit information.
Latest commit message
Commit time


This repository contains a .NET library and a corresponding Windows command line utility that can be used to upload a compiled sketch (.HEX) directly to an Arduino board over USB. It talks to the boards bootloader over the serial (USB) connection, much like avrdude does (when invoked from the Arduino IDE, or from the command line).



The library has been tested with the following configurations:

Arduino Model MCU Bootloader protocol
Leonardo ATMega32U4 AVR109
Mega 1284 ATMega1284 STK500v1
Mega 2560 ATMega2560 STK500v2
Micro ATMega32U4 AVR109
Nano (R2) ATMega168 STK500v1
Nano (R3) ATMega328P STK500v1
Uno (R3) ATMega328P STK500v1

If you have a need for this library to run on another Arduino model, feel free to open an issue on GitHub, it should be relatively straightforward to add support (for most).

Support for Mega 1284 was added by, thanks!

How to use the command line application

Download the latest Windows binaries here (.zip file, version 3.2.0).

When running ArduinoSketchUploader.exe without arguments, the application will document its usage:

Copyright c Christophe Diericx 2016 - 2018

  -f/--file required option is missing.
  -m/--model required option is missing.

  -f, --file     Required. Path to the input file (in intel HEX format) which
                 is to be uploaded to the Arduino.

  -p, --port     Name of the COM port where the Arduino is attached (e.g.
                 'COM1', 'COM2', 'COM3'...).

  -m, --model    Required. Arduino model. Valid parameters are any of the
                 following: [Leonardo, Mega1284, Mega2560, Micro, NanoR2,
                 NanoR3, UnoR3].

  --help         Display this help screen.

A sample command line invocation (for a Mega2560 type Arduino attached to COM4):

ArduinoSketchUploader.exe --file=C:\MyHexFiles\myHexFile.hex --port=COM4 --model=Mega2560

If only a single COM port is in use on the system (used by the attached Arduino), one can omit the port:

ArduinoSketchUploader.exe --file=C:\MyHexFiles\myHexFile.hex --model=UnoR3

How to use the .NET library

NuGet version

Link the following nuget package in your project in order to use the ArduinoUploader:

Alternatively, install the package using the nuget package manager console:

Install-Package ArduinoUploader

The following minimal snippet shows how to upload a .HEX file to an Arduino (UNO) board attached at COM port 3:

var uploader = new ArduinoSketchUploader(
    new ArduinoSketchUploaderOptions()
        FileName = @"C:\MyHexFiles\UnoHexFile.ino.hex",
        PortName = "COM3",
        ArduinoModel = ArduinoModel.UnoR3


As discussed above, one can try to auto-detect the COM port by omitting it.


In earlier versions of the library, it emitted log messages through a dependency on NLog. From an architectural point of view, it is suboptimal to be forcing a dependency on a particular logging framework from library code.

A simple IArduinoUploaderLogger interface is exposed from within the library. Implement this interface, and pass an instance into the ArduinoSketchUploader constructor if you want to consume log messages (in varying levels, from Info to Trace).

Implementing the interface using NLog consists of nothing more than this:

private class NLogArduinoUploaderLogger : IArduinoUploaderLogger
    private static readonly Logger Logger = LogManager.GetLogger("ArduinoSketchUploader");

    public void Error(string message, Exception exception)
        Logger.Error(exception, message);

    public void Warn(string message)

    public void Info(string message)

    public void Debug(string message)

    public void Trace(string message)


A .NET library and a command line utility to upload a compiled sketch (. HEX file) directly to an Arduino board.




No packages published