Arduino published updated terms and conditions: no longer an open commons
65 comments
·November 21, 2025ndiddy
This article is somewhat misleading. The changed ToS only covers Arduino's hosted cloud services, not the IDE or microcontroller library. This is spelled out in black and white in the first paragraph of the ToS:
> 1.1 The Site is part of the platform developed and managed by Arduino, which allows users to take part in the discussions on the Arduino forum, the Arduino blog, the Arduino User Group, the Arduino Discord channel, and the Arduino Project Hub, and to access the Arduino main website, subsites, Arduino Cloud, Arduino Courses, Arduino Certifications, Arduino Docs, the Arduino EDU kit sites to release works within the Contributor License Agreement program, and to further develop the Arduino open source ecosystem (collectively, the “Platform”). The use of the Site, the Platform, and the Services is governed by these Terms including the other documents and policies made available on the Platform by Arduino.Certifications, Arduino Docs, the Arduino EDU kit sites to release works within the Contributor License Agreement program, and to further develop the Arduino open source ecosystem (collectively, the “Platform”). The use of the Site, the Platform, and the Services is governed by these Terms including the other documents and policies made available on the Platform by Arduino.
mrlambchop
(caveat - not a lawyer... but I'll share my opinion)
That list in 1.1 isn’t an exhaustive definition which is IMO, one of the causes of the fire. Again, "IMO", the list is an illustrative set of examples as there is no limiting language like "solely" or "only" and the clause even mixes services and purposes, which again signals it’s descriptive rather than definitive.
Saying that, whilst the list inside the definition of "the Platform" is illustrative, the category it defines seems scoped to Arduino-hosted online properties which could be argued is the intent. But its an argument alas...
Either way, ambiguous policy is being communicated by these T+C updates and that is a real problem.
whynotmaybe
> The most dangerous change is Arduino now explicitly states that using their platform grants you no patent licenses whatsoever. You can’t even argue one is implied.
> This means Qualcomm could potentially assert patents against your projects if you built them using Arduino tools, Arduino examples, or Arduino-compatible hardware.
Yep, the complete opposite of "open".
abstractbeliefs
Arduino has long been fraught with governance and licensing issues, but at its core has been supported first and foremost by a community of keen amateurs and patient professionals teaching in their off time.
This is a reminder - never sell out your baby unless you're willing to see it squeezed for every penny, community be damned.
adfm
Arduino is as influential as it is controversial and has been from the beginning.
https://arduinohistory.github.io
https://hackaday.com/2016/03/04/wiring-was-arduino-before-ar...
adhoc_slime
arduino's response to the discourse is here:
https://blog.arduino.cc/2025/11/21/the-arduino-terms-of-serv...
M95D
I don't trust that reply.
I'm not saying the person(s) who wrote that is(are) lying. It's just that it doesn't seem to come from someone with authority to make decisions like that or even from someone well informed about the global strategy of the corporation.
To me "Arduino Team" is just a bunch of hopeful or even naive employees.
qwertox
Do tinkerers still use Arduino? I have a couple of boards here, but since I moved to ESP32, I never used them again. The last usages I gave an Arduino board was for it to serve as a programmer for my ESP2688. And the Arduino IDE has been replaced with PlatformIO in VS Code.
fodkodrasz
Not sure if this really counts as tinkering, but the other day I needed a custom HID device for my PC. I ordered an Arduino Micro (I think?), one that supports HID out of the box, and with under 300 lines of code my problem was solved.
The Arduino HAL and the overall comfort of the Arduino IDE are genuinely valuable. I didn’t have to learn new flashing tools or a new debugging toolchain just to light a few LEDs, read some buttons, and emulate keypresses on a PC. The learning curve was basically zero.
I’ve worked with embedded systems before, and this level of simplicity is incredibly useful for people who just want to ship simple solutions to simple problems without fighting through vendor-specific, arcane tooling.
I've got some RP2350s since then with Micropython, now those might be even better for getting stuff done (without network or extreme low power needs)
ghurtado
No we don't.
I have dozens of Arduinos that I will never use.
With a similarly priced (sometimes cheaper) platform like the amazing rp2040 / rp2350 which is roughly 100 times more powerful, I have no idea what the niche is for them any more.
The way they dropped the ball with their IDE is amazing. It still looks and feels like something that was rejected during beta testing in 1993
Arduino is following roughly the same trajectory as BlackBerry, with the current phase being "rapidly fading into obscurity"
adiabatichottub
I'm sure somebody like me would happily take them off your hands. The AVR is still a solid platform for low-level applications. A lot of the Arduino libraries never really took full advantage of what you could do with that chip. Whatever happens with the Arduino IDE, those boards will still be useful tools for quite a while.
cptskippy
I just made the discovery the other day that there are two Arduino IDEs, the old crusty one maintained by Arduino.org and the new hotness maintained by Arduino.cc.
I'd been using the Arduino.org version which had mostly driven me to use PlatformIO and ESPHome.
https://www.arduino.cc/en/software/#ide
Unfortunately, but perhaps fortuitously, I needed to use a Library only compatible with Arduino 3.0.0 which is incompatible with PlatformIO. That lead me to discover the Arduino.cc IDE which, while not on par with VSCode, is dramatically better than the Arduino.org IDE.
JKCalhoun
I actually use Teensy. I found that the ESP32 and its whole WiFi stack (?) were slowing the device down. It's not bare-bones enough for many of my projects.
Fairburn
Same, esp32. Not liking the path that Arduino is on currently.
hiddencost
Yup. Esp32 is just better.
sansseriff
I remember 15 years ago when I was in highschool I really wanted to learn how to program 8 bit microcontrollers without Arduino. And everybody looked at me like I was crazy. There was barely any learning material out there about how to do this.
Now, I imagine the bias pushing everyone to learn on arduino is even more intense? Who out there is programming these chips in pure C using open source compilers and bootloaders?
Edit: Of course there's other platforms like Esp32; teensy; seed. But I've only programmed Esp32s using the arduino dev environment. Are there other good ways of doing it?
phoehne
15 years ago I think Arduino was the best choice for educational purposes. I still think it's a great choice now. The fact the IDE and board are basically the same as they were 15 years ago, means you can figure out how to set everything up once and focus on teaching, rather than PC trouble-shooting. Which, for basic concepts, or younger kids, is great. And if they find a 5 or 10 year old video on how to do something, it's still relevant.
If I were putting teaching materials today - I would pick something like Micro python. The down side is it isn't as "canned" a solution, meaning there might be something new to figure out every so often. Which means you spend more time helping people trouble shoot why something isn't working, instead of teaching something useful. On the up side, Python is pretty much the introductory language of choice, today. With lots of available materials.
That's not to say Arduino was perfect. Far from it. Just easier to do, and more consistent over time, than other options.
colonial
> Are there other good ways of doing it?
I'm working on an ESP32 project right now, and Espressif provides shrink-wrapped toolchains for C/++ and Rust. The latter even comes with a little tool called 'espup' that cleanly installs their fork of Rust and LLVM (for Xtensa support) - I was able to compile and run a blinky in less than half an hour.
See https://docs.espressif.com/projects/rust/book/ - it also wasn't too hard for me to whip up a Nix Flake with the same toolchain, if that's your jam.
RobRivera
Whats the motorola ecosystem like these days? Its been a good 16 years for me
cptskippy
> But I've only programmed Esp32s using the arduino dev environment.
Well you can use PlatformIO/VSCode and the ESP-IDF.
If you're ok with the Arduino 2 framework, then you can use PlatformIO as well. Unfortunately Arduino 3 support isn't there yet so a lot of libraries like HomeSpan won't work on PlatformIO at the moment.
https://github.com/platformio/platform-espressif32/issues/12...
zajio1am
From Arduino ecosystem i always have a feeling that they try to do an unnecessary ecosystem lock-in. Most Arduinos are just Atmel AVR MCU with fancy bootloader. You do not need Arduino-this or Arduino-that for programming them, avr-gcc and avr-libc is enough.
abstractbeliefs
I think it's important to understand the early development.
It's true that you can (and always could) use avr-gcc and libc, but the core sale was what makes it not this.
The "locked in"/captured API and IDE were directly extensions of a language and IDE called Processing.
Processing overlaid an art-focussed layer on top of Java, providing a simpler API, and an IDE with just two buttons.
Arduino was based on this - the same IDE format, similar API conventions (just on top of C++), precisely to allow these same artists to move into physical installations and art.
Arduino was not designed initially to be so general, it was tool written by and for this specific group of people, so has opinions and handrails that limit the space to provide the same affordances as Processing specifically.
phoehne
From an embedded developer's perspective, Arduino is awful. That hero-loop programming is not what anyone should ever do. And experienced developers can get better results from something like FreeRTOS (or if you're a masochist Zephyr). And ESP32s are cheaper, as are RP2040s. ...
But take a room full of kids and get them to write a program that blinks an LED, or drive a simple 'robot' forward, and it's awesome. Easy to use. I've never burned out a board (even driving considerable current through them). Things are tolerably well marked. Lots of teaching tools. Lots of different suppliers of easy to connect motors, servos, lights, sensors, etc.
For the same reason, if you are not an embedded engineer, but need a simple micro-controller to turn something on an off like a heater in a chicken coop, it's fantastic. And if you want, buy the $5 knock-off Uno. It should be the same, except that it doesn't support the (now defunct) foundation.
oytis
There is no lock in, you can use avr-gcc with Arduino boards. Arduino is a portable SDK with HAL, you can add support for your own devices to it pretty easily
ghurtado
The lock-in is that it's a big pain in the arse to use anything but their IDE.
Most vendor lock-in isn't "it's impossible to do the thing" but "it's hard enough to do the thing any other way, so this is effectively the only practical way to do it"
MSFT_Edging
It's also possible to import the Arduino libs/headers and build against them with a little bit of Make.
I put together a simple setup to skip the arduino ide on an AVR design, but still be able to use their serial.println and other utilities. You can use it side by side with manual register masks for enabling IO.
zajio1am
Yes, i mean more like educational lock-in, trying to push their own tools and SDKs so people get used to them.
oytis
The point is ease of use. It was designed for artists and other non-programmers originally. I've seen people who would never figure out how to use a crosscompiler do pretty cool things with Arduino.
baaron
Previous discussion: https://news.ycombinator.com/item?id=45984143
timbit42
This article is much, much better than the LinkedIn article though.
dang
Thanks, we'll put that in the top text as well.
oytis
What's the point of paying a hefty sum of money for the right to destroy a product and a team neither or whom are in competition with you? Not the first time I see it happening
toyg
You're buying an established brand to augment yours, regardless of what that brand does. It's a sort of SEO.
In this case, though, I disagree that there was no competition. Ecosystems like Arduino are real threats to large incumbents in adjacent sectors. If all the tooling and products necessary to embedded development end up being easily accessible, expensive options like Qualcomm's become effectively commoditized. Qualcomm basically acted like Bill Gates buying Compu-Global-Hyper-Mega-Net https://simpsons.fandom.com/wiki/Compu-Global-Hyper-Mega-Net
nyeah
For some reason most companies never seem to realize that they will destroy their acquisitions. It's always kind of an afterthought. "Oh, right, we have to terrify the new customers and lay off the people who make the products work. Sam, take care of that, will you?"
Acquisitions tend to be done in a haze of dream-state thinking. Maybe that's part of it.
tonyhart7
Qualcomm would force arduino to focus at enterprise offering
its happy ending for both investor
teo_zero
Please, before commenting on this article, be sure to read Qualcomm's reply posted by adhoc_slime: https://news.ycombinator.com/item?id=46007805
actinium226
It doesn't look like they've made any drastic changes that would impel anyone to leave Arduino tomorrow, or in the foreseeable future, but if they keep going down this route I imagine the community will move to RPi. They've always been vastly more performant than Arduino and they can run linux, which is somewhat more approachable than the concept of programming a microcontroller and only being able to talk to it over serial.
bangaladore
RPi is not a good analog compared to Arduino.
The main feature of classic Arduino boards has always been a thin abstraction layer on bare metal. RPi is not that at all.
(As mentioned by the other commenter, I'm referring to their Linux boards, not the Pico)
ginko
RPi Picos are certainly bare metal.
bangaladore
Yes, their MCU offerings are. And I generally think that Micropython is a better "modern" Arduino.
But most people know them for their Linux boards. And that's what OC was talking about.
phoehne
It won't be just one big move that kills the community. Eventually, I could see it as locked down as the STM32 ecosystem. Nor do I see them continuing to sell the same parts for over a decade. They'll just want to use it to promote new kit. Nor do I see them keeping to board designs open over the long term. That will come one little step at a time.
nyeah
The patent language would worry me a lot. It would be tough to have to admit, up front, "even if this widget becomes popular I can never build a business on it."
But I'm not using Arduino, so idk.
phoehne
The cool thing about an Arduino is you can just buy the boards and use them in a commercial product. This isn't something you can do with other boards. Some people have said the license requires you to disclose your firmware, but that's not the way I read it and I've never heard of anyone being compelled to release anything (unless they modify any GPL covered code).
Not all platforms give you the right to do this. For example, if you buy a dev board from STM - it's only licensed for research and development. Also, because you might want to continue to sell the same thing for years, and the board designs were open-sourced, you could buy the same part for years and years. So you can continue to sell your CNC kit that uses an Mega 2560 without worrying about Arduino coming after you or that they'd discontinue that part.
nyeah
Has Qualcomm changed that?
exasperaited
> "even if this widget becomes popular I can never build a business on it.
With the exception of a handful of applications for their higher-end boards, I would think most of this flotilla of ships has already sailed, just on a cost basis?
Especially lately. So much more choice.
nyeah
There's believing Arduino isn't useful for anything serious. And that might be true, I don't know. But then there's buying it and making sure it isn't good for anything serious. It's that second part that confuses me.
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exasperaited
Full-size RPi isn't Arduino's competition, surely (except for the newest Uno Q, which is a novel take on a Pi-type SBC).
There are meaningful disadvantages to replacing an Arduino with even the Pi Zero.
Yeah, makers will move to Raspberry Pi products for the ecosystem and documentation, but it will be to the RP2040/2350 products.
But also the ESP32 series, particularly Adafruit's kit.
frumplestlatz
It looks like they have modern options that run Linux now; it’s no longer the realm of 8-bit Atmel MCUs.
I’m not sure what the value proposition is overall, though. The IDE, perhaps? I never particularly saw the draw, but it clearly met the needs of some real market niche.
ibgeek
Maybe two different things here: SBCs that run Linux versus microcontrollers (MCUs).
MCUs are lower power, have less overhead, and can perform hard real-time tasks. Most of what Arduino focuses on are MCUs. The equivalent is the Raspberry Pi Pico.
In my experience, the key thing is the library ecosystem for the C++ runtime environment. There are a large number of Arduino and third-party high-level libraries provided through their package management system that make it really easy to use sensors and other hardware without needing to write intermediate level code that uses SPI or I2C. And it all integrates and works together. The Pico C/C++ SDK is lower level and doesn’t have a good library / package management story, so you have to read vendor data sheets to figure out how to communicate with hardware and then write your own libraries.
It’s much more common for less experienced users to use MicroPython. It has a package management and library ecosystem. But it’s also harder to write anything of any complexity that fits within the small RAM available without calling gc.collect() in every other line.
exasperaited
Yes. One looming concern here is that if the new Arduino is happy locking stuff down, the Arduino IDE story could end up being murkier like the PlatformIO story.
Previous thread: The Death of Arduino? - https://news.ycombinator.com/item?id=45984143