Just to be explicit, while this competes in the &quot;tiny but breadboard-friendly microcontroller&quot; market, it&#x27;s not a nRF51 board (it&#x27;s actually a more powerful chip, CPU-wise) and it does not have any sort of radio, bluetooth or otherwise.<p>The support from PJRC is great, though. And if you want to use the Arduino environment, I don&#x27;t think <i>anyone</i> puts more work into making it work flawlessly on a non-AVR platform than Paul does, not even the Arduino guys themselves with their own ARM boards.