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rsora Add support for compile with debug optimizations (#593)
* add debug symbols option in CLI and gRPC insterface

* Calculate precompiled core path usign also build optimization flags

* Align failing lecacy tests with new hashing behaviour
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Tests passing Nightly build codecov

arduino-cli is an all-in-one solution that provides builder, boards/library manager, uploader, discovery and many other tools needed to use any Arduino compatible board and platforms.

This software is currently under active development: anything can change at any time, API and UI must be considered unstable until we release version 1.0.0.

How to contribute

Contributions are welcome!

Please read the document How to contribute which will guide you through how to build the source code, run the tests, and contribute your changes to the project.

Thanks to all our contributors!

How to install

Get the latest version

You have several options to install the latest version of the Arduino CLI on your system.

Install via Homebrew (macOS/Linux)

The Arduino CLI is available as a Homebrew formula since version 0.5.0:

brew update
brew install arduino-cli

Use the install script

The easiest way to get the latest version of arduino-cli on any supported platform is using the script:

curl -fsSL | sh

The script will install arduino-cli at $PWD/bin, if you want to target a different directory, for example ~/local/bin, set the BINDIR environment variable like this:

curl -fsSL | BINDIR=~/local/bin sh

Download the latest packages

You can download the latest version of the pre-built binaries for the supported platforms from the release page or following the links in the following table. Once downloaded, extract the binary arduino-cli into a directory which is in your PATH.

Linux Linux 32 bit Linux 64 bit
Linux ARM Linux ARM 32 bit Linux ARM 64 bit
Windows Windows 32 bit Windows 64 bit
Mac OSX   Mac OSX
Deprecation notice: links in the form<platform>.tar.bz2 won’t be further updated. That URL will provide the version 0.3.7-alpha.preview, regardless of further releases.

Get a nightly build

These builds are generated everyday at 01:00 GMT from the master branch and should be considered unstable. In order to get the latest nightly build available for the supported platform, use the following links:

Linux Nightly Linux 32 bit Nightly Linux 64 bit
Linux ARM Nightly Linux ARM 32 bit Nightly Linux ARM 64 bit
Windows Nightly Windows 32 bit Nightly Windows 64 bit
Mac OSX   Nightly Mac OSX

These links return a 302: Found response, redirecting to latest generated builds by replacing latest with the latest available build date, using the format YYYYMMDD (i.e for 2019/Aug/06 latest is replaced with 20190806 )

Checksums for the nightly builds are available at<DATE>-checksums.txt

Once downloaded, extract the executable arduino-cli into a directory which is in your PATH.

Build from source

If you’re familiar with Golang or if you want to contribute to the project, you will probably build the arduino-cli locally with your Go compiler. Please refer to the contributing doc for setup instructions.

If you don’t have a working Golang environment or if you want to build arduino-cli targeting different platforms, you can use Docker to get a binary directly from sources. From the project folder run:

docker run -v $PWD:/arduino-cli -w /arduino-cli -e PACKAGE_NAME_PREFIX='snapshot' arduino/arduino-cli:builder-1 goreleaser --rm-dist --snapshot --skip-publish

Once the build is over, you will find a ./dist/ folder containing the packages built out of the current source tree.

How to use

Despite there's no feature parity at the moment, Arduino CLI provides many of the features you can find in the Arduino IDE, let's see some examples.

Create a configuration file

Arduino CLI doesn't strictly require a configuration file to work because the command line interface provides any possible functionality. However, having one can spare you a lot of typing when issuing a command, so let's create it right ahead with:

$ arduino-cli config init
Config file written: /home/luca/.arduino15/arduino-cli.yaml

If you inspect arduino-cli.yaml contents, you'll find out the available options with their respective default values.

Create a new sketch

To create a new sketch named MyFirstSketch in the current directory, run the following command:

$ arduino-cli sketch new MyFirstSketch
Sketch created in: /home/luca/MyFirstSketch

A sketch is a folder containing assets like source files and libraries; the new command creates for you a .ino file called MyFirstSketch.ino containing Arduino boilerplate code:

$ cat $HOME/MyFirstSketch/MyFirstSketch.ino
void setup() {

void loop() {

At this point you can use your favourite file editor or IDE to open the file $HOME/MyFirstSketch/MyFirstSketch.ino and change the code like this:

void setup() {

void loop() {
  digitalWrite(LED_BUILTIN, HIGH);
  digitalWrite(LED_BUILTIN, LOW);

Connect the board to your PC

The first thing to do upon a fresh install is to update the local cache of available platforms and libraries by running:

$ arduino-cli core update-index
Updating index: package_index.json downloaded

After connecting the board to your PCs by using the USB cable, you should be able to check whether it's been recognized by running:

$ arduino-cli board list
Port         Type              Board Name              FQBN                 Core
/dev/ttyACM1 Serial Port (USB) Arduino/Genuino MKR1000 arduino:samd:mkr1000 arduino:samd

In this example, the MKR1000 board was recognized and from the output of the command you see the platform core called arduino:samd is the one that needs to be installed to make it work.

If you see an Unknown board listed, uploading should still work as long as you identify the platform core and use the correct FQBN string. When a board is not detected for whatever reason, you can list all the supported boards and their FQBN strings by running the following:

$ arduino-cli board listall mkr
Board Name              FQBN
Arduino MKR FOX 1200    arduino:samd:mkrfox1200
Arduino MKR GSM 1400    arduino:samd:mkrgsm1400
Arduino MKR WAN 1300    arduino:samd:mkrwan1300
Arduino MKR WiFi 1010   arduino:samd:mkrwifi1010
Arduino MKRZERO         arduino:samd:mkrzero
Arduino/Genuino MKR1000 arduino:samd:mkr1000

Install the core for your board

To install the arduino:samd platform core, run the following:

$ arduino-cli core install arduino:samd
Downloading tools...
arduino:arm-none-eabi-gcc@4.8.3-2014q1 downloaded
arduino:bossac@1.7.0 downloaded
arduino:openocd@0.9.0-arduino6-static downloaded
arduino:CMSIS@4.5.0 downloaded
arduino:CMSIS-Atmel@1.1.0 downloaded
arduino:arduinoOTA@1.2.0 downloaded
Downloading cores...
arduino:samd@1.6.19 downloaded
Installing tools...
Installing platforms...
arduino:samd@1.6.19 - Installed
arduino:arm-none-eabi-gcc@4.8.3-2014q1 - Installed
arduino:bossac@1.7.0 - Installed
arduino:openocd@0.9.0-arduino6-static - Installed
arduino:CMSIS@4.5.0 - Installed
arduino:CMSIS-Atmel@1.1.0 - Installed
arduino:arduinoOTA@1.2.0 - Installed

Now verify we have installed the core properly by running:

$ arduino-cli core list
ID              Installed       Latest  Name
arduino:samd    1.6.19          1.6.19  Arduino SAMD Boards (32-bits ARM Cortex-M0+)

Great! Now we are ready to compile and upload the sketch.

Adding 3rd party cores

If your board requires 3rd party core packages to work, you can list the URLs to additional package indexes in the Arduino CLI configuration file.

For example, to add the ESP8266 core, edit the configuration file and change the board_manager settings as follows:


From now on, commands supporting custom cores will automatically use the additional URL from the configuration file:

$ arduino-cli core update-index
Updating index: package_index.json downloaded
Updating index: package_esp8266com_index.json downloaded
Updating index: package_index.json downloaded

$ arduino-cli core search esp8266
ID              Version Name
esp8266:esp8266 2.5.2   esp8266

Alternatively, you can pass a link to the the additional package index file with the --additional-urls option, that has to be specified every time and for every command that operates on a 3rd party platform core, for example:

$ arduino-cli  core update-index --additional-urls
Updating index: package_esp8266com_index.json downloaded

$ arduino-cli core search esp8266 --additional-urls
ID              Version Name
esp8266:esp8266 2.5.2   esp8266

Compile and upload the sketch

To compile the sketch you run the compile command passing the proper FQBN string:

$ arduino-cli compile --fqbn arduino:samd:mkr1000 MyFirstSketch
Sketch uses 9600 bytes (3%) of program storage space. Maximum is 262144 bytes.

To upload the sketch to your board, run the following command, this time also providing the serial port where the board is connected:

$ arduino-cli upload -p /dev/ttyACM0 --fqbn arduino:samd:mkr1000 MyFirstSketch
No new serial port detected.
Atmel SMART device 0x10010005 found
Device       : ATSAMD21G18A
Chip ID      : 10010005
Version      : v2.0 [Arduino:XYZ] Dec 20 2016 15:36:43
Address      : 8192
Pages        : 3968
Page Size    : 64 bytes
Total Size   : 248KB
Planes       : 1
Lock Regions : 16
Locked       : none
Security     : false
Boot Flash   : true
BOD          : true
BOR          : true
Arduino      : FAST_CHIP_ERASE
Erase flash
done in 0.784 seconds

Write 9856 bytes to flash (154 pages)
[==============================] 100% (154/154 pages)
done in 0.069 seconds

Verify 9856 bytes of flash with checksum.
Verify successful
done in 0.009 seconds
CPU reset.

Add libraries

If you need to add more functionalities to your sketch, chances are some of the libraries available in the Arduino ecosystem already provide what you need. For example, if you need a debouncing strategy to better handle button inputs, you can try searching for the debouncer keyword:

$ arduino-cli lib search debouncer
  Name: "Debouncer"
    Author: hideakitai
    Maintainer: hideakitai
    Sentence: Debounce library for Arduino
    Paragraph: Debounce library for Arduino
    Category: Timing
    Architecture: *
    Types: Contributed
    Versions: [0.1.0]
  Name: "FTDebouncer"
    Author: Ubi de Feo
    Maintainer: Ubi de Feo, Sebastian Hunkeler
    Sentence: An efficient, low footprint, fast pin debouncing library for Arduino
    Paragraph: This pin state supervisor manages debouncing of buttons and handles transitions between LOW and HIGH state, calling a function and notifying your code of which pin has been activated or deactivated.
    Category: Uncategorized
    Architecture: *
    Types: Contributed
    Versions: [1.3.0]
  Name: "SoftTimer"
    Author: Balazs Kelemen <>
    Maintainer: Balazs Kelemen <>
    Sentence: SoftTimer is a lightweight pseudo multitasking solution for Arduino.
    Paragraph: SoftTimer enables higher level Arduino programing, yet easy to use, and lightweight. You are often faced with the problem that you need to do multiple tasks at the same time. In SoftTimer, the programmer creates Tasks that runs periodically. This library comes with a collection of handy tools like blinker, pwm, debouncer.
    Category: Timing
    Architecture: *
    Types: Contributed
    Versions: [3.0.0, 3.1.0, 3.1.1, 3.1.2, 3.1.3, 3.1.5, 3.2.0]

Our favourite is FTDebouncer, can install it by running:

$ arduino-cli lib install FTDebouncer
  FTDebouncer depends on FTDebouncer@1.3.0
  Downloading FTDebouncer@1.3.0...
  FTDebouncer@1.3.0 downloaded
  Installing FTDebouncer@1.3.0...
  Installed FTDebouncer@1.3.0

Getting help

arduino-cli is a container of commands and each command has its own dedicated help text that can be shown with the help command like this:

$ arduino-cli help core
  Arduino Core operations.

    arduino-cli core [command]

    ./arduino-cli core update-index

  Available Commands:
    download     Downloads one or more cores and corresponding tool dependencies.
    install      Installs one or more cores and corresponding tool dependencies.
    list         Shows the list of installed platforms.
    search       Search for a core in the package index.
    uninstall    Uninstalls one or more cores and corresponding tool dependencies if no more used.
    update-index Updates the index of cores.
    upgrade      Upgrades one or all installed platforms to the latest version.

    -h, --help   help for core

  Global Flags:
        --additional-urls strings   Additional URLs for the board manager.
        --config-file string        The custom config file (if not specified the default will be used).
        --format string             The output format, can be [text|json]. (default "text")
        --log-file string           Path to the file where logs will be written.
        --log-format string         The output format for the logs, can be [text|json].
        --log-level string          Messages with this level and above will be logged.
    -v, --verbose                   Print the logs on the standard output.

  Use "arduino-cli core [command] --help" for more information about a command.


Arduino Uno/Mega/Duemilanove is not detected when you run arduino-cli board list

Possible causes:

  • Your board is a cheaper clone, or
  • It mounts a USB2Serial converter like FT232 or CH320: these chips always reports the same USB VID/PID to the operating system, so the only thing that we know is that the board mounts that specific USB2Serial chip, but we don’t know which board is.
What's the FQBN string?

For a deeper understanding of how FQBN works, you should understand Arduino Hardware specification. You can find more information in this arduino/Arduino wiki page

Using the gRPC interface

The client_example folder contains a sample program that shows how to use gRPC interface of the CLI.

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