Hello, I had a similar case with a varistor from AliExpress too, after some time and for an unknown reason it shorted, but without any visual indication of a problem. It was on the dual ssr board that didn't have a fuse before the varistor so it triggered the circuit breaker... Board worked fine for a few weeks without varistor after that, but I didn't feel confident to continue using it for a long time.
@neverdie said in Everything nRF52840:
@nc78 Earlier you had asked about vendors for the dongle. I found an alternative dongle that ships from China:
https://www.tindie.com/products/Zelin/nrf52840-micro-dev-kit-usb-dongle/
Price is very similar. I like it better than the Nordic dongle, because it exposes pins P0.06 and P0.08, which are used by the DK for UART communications.
Thank you for the link, it looks like an interesting dongle. But after asking for a quote at Arrows and giving up (looked like a big mess to get items shipped here as it cannot be included in another order and they would only deliver in US), I realized that they now have them in stock.
So I bought 2 at 9.5$ each + 12% discount on the website, so less than 8.5$ each and as I bought other items (including BT840 modules) I have free express shipping too. Cheapest price + free express shipping, I think it's called "having it both ways" 
So I'll be able to join the little nrf52840 club next week.
@sundberg84 said in What did you build today (Pictures) ?:
@yveaux nothing that I can post here unfortunately... only a ladder for my cat
non automated.
Just pretend you have automated your cat. We can't control from here.
@neverdie said in nRF5 action!:
In a perfect world, yes. However, since that doesn't yet exist, the question is: what else, if anything, can be done today?
Today is either use bluetooth/ant/thread (all need softdevice) or write your own OTA bootloader for legacy radio without softdevice.
@neverdie said in Everything nRF52840:
@heinzv I use the Nordic development kit for flashing. At least for me, it's the easiest.
Same here. NFR52 DK, works perfectly with Segger ES and I just do drag & drop of the compiled file to the virtual drive of the DK when using Arduino.
I just had the same problem, thank you @mcrahr for reporting and @mfalkvidd for supplying a simple workaround, now my MySensors installation is ready to be relaunched after a loooong break !
@scalz said in Everything nRF52840:
Our plan (another team member might be interested, he played with cc135x too) is to use MySensors lib (or a part). The main reason : MySensors API is compatible with lot of controllers.
Yes that's the big advantage of MySensors, having something you can use on many controllers. So even if the RF stack/network is completely different it's still nice to have a gateway that pretends to be a MySensors gateway to the controller.
And what about Segger Embedded Studio ? It's now free to use with Nordic SDK for NRF5 MCUs
https://www.segger.com/news/segger-embedded-studio-ide-now-free-for-nordic-sdk-users/
@neverdie said in Recommendation for PCB fab?:
Anyone try this? Sounds like a promising alternative:
https://hackaday.com/2018/09/18/get-your-pcbs-made-at-the-mall/
Good idea but it's not really solving much, it's keeping the most annoying parts: using chemicals (can't do it in an appartment building), making the vias by hand.
@omemanti said in nRF5 action!:
@nca78 yeah I noticed that, what is the downside of the NRF52810?
At least lower memory (ram and flash) and I don't know for the peripherals. Not sure if the core for nrf52832 will work flawlessly or not. Given the tiny price difference it's better to stick to nrf52832.
Low frequency crystal will make you save energy when you use Bluetooth, because it needs to wake up at precise time frames to send/receive data. Do in that case the internal oscillator is not precise enough and mcu has to wake up regularly to recalibrate it with high frequency clock.
For MySensors, it's not useful.