https://community.element14.com/products/arduino/Find articles, links to purchase the latest products and projects using the popular brand Arduino on the element14 Communityen-USTelligent Community 12https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235504Sat, 09 May 2026 20:55:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:e9bc9325-e89d-4db6-b45c-ffbba45bff0bBigGThis video (from 8 mins) might help explain what's going on... suspect your issues are related to this new "LLEXT" feature https://docs.zephyrproject.org/latest/services/llext/index.html www.youtube.com/watchhttps://community.element14.com/products/arduino/m/managed-videos/151311Sat, 09 May 2026 20:55:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:b2803058-394a-4109-99a7-26d68b08efdcBigGThe Arduino Uno Q was just unveiled, and it's packing some new, interesting, compute capabilities, thanks to its Linux + Zephyr RTOS dual-brain architecture! I was lucky enough to get my hands on it already, and in this video I dive into all the g...https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235491Sat, 09 May 2026 14:26:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:1bda6d68-4da6-4f98-9f17-2474c60eb014SensoredHacker0Weird, because for everyone I know IRL, these things typically just work.https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235482Sat, 09 May 2026 02:48:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:a17be0db-632d-4997-8b5e-cbf13f9f8db0embeddedguyFrom your problem description, I can just imagine that it is just typical Arduino thing. Most people have experienced this..https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235476Fri, 08 May 2026 23:32:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:7c76341f-005e-4e46-9616-1771816beadeSensoredHacker0Welp, I re-flashed the linux image, but the arduino bits are still doing the same thing. it says the code uploaded but doesnt run it. so then IDK i messed with it ALOT. My conclusion: The Uno Q, despite appearing to be functional in the traditional arduino toolchain is not actually, compatible with it, and subject to breaking if you try to to use it the same way. Saying it another way, The integration of Arduino Uno Q is not complete. the code examples for everything are not going to work right, and the IDE is not going to tell you. so then I got on the shell. and wrote code from there, it worked, but, no serial. so then more digging: you can to this to build and compile in the same step, which was a function of the build command prior to Arduino's acquisition. Evidently, just pressing build doesn't save and compile you code as it once did. $ arduino-cli compile --upload -p /dev/ttyACM0 --fqbn arduino:zephyr:unoq . Here is a corrected blink.ino for the Uno Q. #include void setup() { Bridge.begin(); Monitor.begin(); pinMode(LED_BUILTIN, OUTPUT); Monitor.println("BOOT"); } void loop() { Monitor.println("Off"); digitalWrite(LED_BUILTIN, HIGH); delay(400); Monitor.println("On"); digitalWrite(LED_BUILTIN, LOW); delay(400); } https://forum.arduino.cc/t/arduino-uno-q-via-ide-no-serial-monitor-output/1411255/21?page=2 https://docs.arduino.cc/tutorials/uno-q/user-manual/ "Note: Serial still works over UART" I'd say thats a lie, but it was working for the first few days, which is very confusing. Its like someone came in an broke all the macros. I can write my own, now that I have a better idea why they are broken. I just wish we werent pretending they we're broken. would have saved me several hours, and much frustration. For real, why would we mess with the serial library??? you know how much stuff that breaks?? $tio /dev/ttyACM0 -b 9600 herdeedur.https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235475Fri, 08 May 2026 21:29:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:18b9cc5b-0694-44f1-8dd4-9766f2aca246SensoredHacker0When ever Opta first came out, my employer wanted desperately to switch. but all the devices you might want to interface with were locked out. I wrote to Arduino and they said they were concerned about licensing, which amounted to a locked down open platform. as I understand it, that has improved over time, but still, we couldn't adopt it. if anyone is going to transition, to some other system, that system either needs support for other devices, or needs to have devices that offer the missing functionality. Arduino Opta had neither.https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235471Fri, 08 May 2026 19:31:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:22551752-ffc5-4734-9d11-746e98739aa0SensoredHacker0yeah the first thing I did was grab an arduino Mega, and keep on working on my project. but for 4 hours, I thought to myself this board is brand new, I literally havent touched, it, was working, and now it doesn't work. The expensive dev board arent what I slap into projects. If I have to buy a dev kit, to experiment on, Im not going to think ooh a 70$ arduino. Ill just pick up a 3$ Uno clone, and see where its lacking. If im putting an expensive devboard in something, I've already built the prototype. So Arduino is probably missing out on a lot of entry level development. I could buy an Uno Q, but now I have some random fail as the first thing Im going to think of. versus this 15 year old arduino MEGA that has never failed even once. We'll see I guess. Maybe a firmware update patches it. A linux server I built in college 20 years ago is still running. The only folks who are going to accept linux as a fault are new linux users. On paper the Uno Q sounds amazing.https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235469Fri, 08 May 2026 19:12:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:6b6d3aa2-e079-4f6b-a881-78e2b048c48dSensoredHacker0Much appreciated. Ill check this out.https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235444Thu, 07 May 2026 19:10:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:6ef55783-5e54-4574-822b-c894e63b5d7ckmikemooA bit aside, but I see the Opta in the same category of "not ready for prime time". I have one. It's too quirky. It's not what I consider "Arduino" - which, to me, infers stable and well supported (both by the company and the community).https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235439Thu, 07 May 2026 16:34:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:c02fc0d9-d8b4-46ec-b056-8af9318ad342BigGAh right, I did not know that. Agree, many of the old libraries will simply do not work. It's a case of rethinking our old ways when doing things with Zephyr. Info is there. It needs understanding. That's tricky without tutorials. docs.zephyrproject.org/.../README.htmlhttps://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235438Thu, 07 May 2026 16:14:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:d59ef0ad-0a05-46b8-9dd0-974f9c4049a6ralphjyIf you are using the Q, the default is using Zephyr - both in AppLab and the standalone Arduino IDE. Creates problems with legacy hardware because some (many?) third party libraries are not updated. I ran into problems with the Arducam libraries. Right now the only option is to port it yourself (a handful of class definition changes). Hope the manufacturers will update their libraries to Zephyr soon. The standalone IDE does work with the Q, but I wouldn't recommend it. Not sure what the real use case is. I tried it because it is more familiar to me and I hoped to reuse code, but I don't think that Arduino is really going to support using software external to AppLab for the Q. Have not investigated if it is possible to remove AppLab to get back the system resources.https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235437Thu, 07 May 2026 15:58:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:999161f1-840e-4861-afe2-79803f4f29a7ralphjyI agree with your comments, but just to clarify what I meant - the Q has much more complexity and many more points of failure, both in hardware and software. I do think the current implementation is faulty and hopefully that will be fixed in time. You're smart to wait for things to settle down, I expect many of the issues to be resolved in the next couple of quarters. And the media interface should be available soon.https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235435Thu, 07 May 2026 15:33:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:1e38acc1-d6bc-4959-a55c-639edca4c9cdBigGI think by default you still use MBed. You need to manually switch to the Zephyr option. Personally, having persevered with getting to know Zephyr RTOS, I find it really good.https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235434Thu, 07 May 2026 15:30:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:a5afffeb-db06-45e6-b5da-de022f42cf41shabazI hope they hurry up. That's a long time to be unsure if things will be stable and if the API or subtle behavior will change. Sad to say that it appears right now for an amount of networking capability, one might want to simply walk away and consider non-Arduino boards, unless they pull their socks up.https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235430Thu, 07 May 2026 15:05:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:dce38efd-96da-4f15-a46c-4a47f14c0ec1BigGArduino has switched to using Zephyr RTOS: https://github.com/arduino/ArduinoCore-zephyr Still a long way to go to get to version 1 - they're at version 0.55. My guess is that it'll go version 1 once the next Zephyr LTS version is released next year.https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235429Thu, 07 May 2026 15:00:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:e93bd881-ef06-4fef-aead-5228267e8000shabazI'm glad you guys are investigating the Q and working through the issues. It will help everyone. However, got to strongly disagree with this: The Q can't really be expected to be compared reliability/stability wise with previous Arduinos. With the new hybird MPU/MCU structure it is going to have a lot more issues than the MCU only boards. That may be the current reality with Q, but is in no way normal. I believe it means that the Arduino people have either (a) treated their creation like a Linux server or desktop PC device, or (b) is simply buggy in their implementation. Either way it's a showstopper as far as I can see. It's frustrating, I would love to use the Q but not if it cannot be power-cycled with confidence. This is not the first device containing a microprocessor and microcontroller, and it needs to start up consistently every single time. I'd be especially concerned if the cause is (a) because then that means there's a complete misunderstanding by them about how people use any typical SBC or any Arduino board for that matter.https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235428Thu, 07 May 2026 14:14:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:c77736b8-226e-47ec-81a7-3fadc86897b5ralphjyThe Q can't really be expected to be compared reliability/stability wise with previous Arduinos. With the new hybird MPU/MCU structure it is going to have a lot more issues than the MCU only boards. I have found that I encountered different sets of issues depending on the hardware and software configuration and development environment. You really haven't indicated how you are set up (PC USB host, headless, standalone), how you are powered, and what your development setup is. Based on your description, I assume that you are using AppLab running on a USB host. How are you determining that it doesn't reach the serial print lines (that would be Monitor rather than Serial in AppLab)? Your Linux side appears to be running (assume you checked dmesg via ssh). If you are in AppLab I would guess that the RouterBridge is failing and may be hanging the MCU. The AppLab Blink example no longer runs only on the MCU. I would recommend that you connect a USB to UART adapter (3.3V) between your PC and the MCU. You could also try one (1.8V) between the PC and the MPU. That would help with debug.https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235426Thu, 07 May 2026 13:30:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:8f4a579d-8ef6-41f9-a9f8-c995dfa92ab4shabazThat's concerning. Q has so much potential, but it's currently let down because of (it feels to me) lack of focus by Arduino. If it's going to stop starting up correctly after some power cycles, then it just won't get used, people will switch to other control boards. They have to take this seriously and eliminate such flakiness from the software/OS build or hardware, this to me is a showstopper, otherwise no-one can trust using it. I bought a Q to try it out, but will wait till it's more mature (hopefully). Also, a few of the other Arduino boards have at least perceived problems, since Mbed is EOL very shortly, and I wonder how long till any replacement Arduino libraries will be reliable. Think Arduino needs to have better messaging at a minimum, so users are not in the dark.https://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-q/235423Thu, 07 May 2026 12:31:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:5315c09b-e850-4331-8c7c-9aa7765d87d6skruglewiczYes I have had similar problems myself. To get it working again, I ended up Flashing a New Image to the UNO Q: https://docs.arduino.cc/tutorials/uno-q/update-image/ To restore the board, follow the specific procedures detailed in the Download & Install CLI Tool section. CRITICAL WARNING! Be aware that performing these instructions will entirely wipe the board. All saved files and configurations will be permanently destroyed. It is essential to back up your work to an external location before proceeding with the flash. Remember that this is currently an experimental platform, not yet suitable for production-level development. As early adopters, we are essentially the "guinea pigs" navigating a developing technology from Arduino. If that works let me knowhttps://community.element14.com/products/arduino/f/arduino-forum/56920/anyone-have-stability-issues-with-arduino-uno-qThu, 07 May 2026 12:16:00 GMT93d5dcb4-84c2-446f-b2cb-99731719e767:3ae18027-2f8c-48ff-88f7-8ebc61294d04SensoredHacker0So im at my PC typing away. The Uno Q ran my code on the first try on the first day i got it, a couple days ago. made some more tests, for 2 days everything was working great. Then, without warning, did not move it, or touch it, it stopped. ok fine I guess. Then I tried to upload new test code. it compiles, and claims to have been uploaded. but the code doesnt work. The hardware which was attached, when it failed: a Max33041E shield, and the Ethernet R3 shield. these had been working for a couple days straight. Not like the code is buggy, but like it doesn't even init the serial print lines. bash my head on the wall for a while. Press Reset. nothing. Un plug it, wait, re insert usb power. $dmesg shows it, loading without issue. Pull the shields off, load blink. same thing, it compiles, and claims to upload, but the code never runs. I haven't reinstalled the boot-loader, by the time I thought to try that, I'd already gone to bed. But I've never had such random problems before. Ive got arduino running in projects that have run for 6 years straight not problem. besides reloading the bootloader and one have some ideas? Are there stability issues with the Arduino Uno Q I should know about? Perhaps the most frustrating thing was that the LED matrix was making little hearts and arduino logos the whole time. meanwhile blink wont run.On the line design challengearduino uno qarduino