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nRF52840 dongle is a cheap (USD10) minimum arm MCU dev board. and it's got easy availability with mainline suppliers (unusual with cheap boards!).
but the show stopper for me was the lack of easy connectivity to a debugger. atleast I thought it was. (it does come with a j-link interface but this is at the bottom! who's gonna unplug it from the prototype board)
I stumbled upon this link: https://flaviutamas.com/2020/notes-getting-started-nrf52-thread
You simple get one of these ribbon cables.
and solder them to the board like this.
the board has a range of wireless connectivity (mcu related; not talking wifi ;) )
which is great for IoT. considering that 99% of embedded projects are IoT,
it's certainly my fav board now...
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