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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@fanoush
OK, so I had to scratch it off. When it was there and D13 was pulled down it draw like 500uA, when pulled up it was still about 145uA (from 4.2V battery). When I scratched it off it still draw about 145uA when pulled up as before however when pulled down it turned off power to VCC pin and went down to normal 5uA idle when radio is not used. So the 140uA is the 3.3V voltage regulator when it is turned on. Which is not that great if you need to power something from 3.3V like the display. Does nice!nano have more efficient 3.3V regulator going to EXT_VCC pin? Anyway, nrf52840 can produce 3.3V (or 1.8V) by itself too when powered from VDDH (5v from usb or 4.2 from battery). And indeed the VDD pad near SWD gives 3.2V even if the regulator is turned off so maybe it could handle that low power display more efficiently.
So overall it is good board with that resistor scratched off. Also the antenna is as good as my other boards, better than watches like Magic3. It can find xiaomi thermometer advertising over coded phy behind several walls which Magic can't. And rssi for that thermometer is about the same as on my phone or 52840 dongle from same location.