@neverdie I was thinking about that, but that's not gonna work. Why? The bootloader that accepts OTA has a private key. The key in the software should match the key.

Just curious design consideration, based on my question to Nordic:

https://devzone.nordicsemi.com/f/nordic-q-a/33448/led-power

LED consumption will not exceed 0.5ma if the pin is configured as s0s1

@neverdie AFAIK, they are all heavily glued to meet IPX67

@neverdie read Issues section in Mark Cooks's repo referenced above. He's just committed a PR to support the display.
I need nrf52 to able to use Central role in my projects. For Mysensors nrf51 is pretty adequate if someone wants to create something like a wearable weather station
Everything is in place.

https://github.com/micooke/arduino-nRF5-smartwatches

Mark is a fantastic guy

@alowhum there is a whole "movement" of people who are trying to reprogram them. Key issue is openability (how hard is to open it)
The last easily openable watches are based on nrf51822, but the good thing is that programming pins are easily accesable and even marked SWD/SCLCK.
Search Ali for ID107HR and google for "roger clark smartwatch"
I am yet to find a watch that would be both nrf52 based AND easily openable

@gohan said in nRF5 Bluetooth action!:

The ST-Link V2 I found it on digikey and similar sites for around 18/19€, is it the right one?

Don't do that. Either buy $2 clones or invest into DK or:
https://www.adafruit.com/product/3571

@gohan you mean programmer? Nothing beats DK with jlink.
Other options: jlink EDU, DIY BlackMagicProbe or STLink

Just to close the loop on DC-DC:

http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fpower.html&anchor=concept

Figure 2

@neverdie thx. Why don't you have a capacitor between DEC4 to GND? I can see only 2 inductors, while Nordic power guidelines prescribe an LC filter between DCC and DEC, ie inductors and a capacitor. nrf52dk also has it.