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May 15, 2017
Tutorial - SparkFun Pro nRF52840 Mini Hookup Guide
about a year ago
Hi, I am encountering a situation where my sketch for the nrf52840 sparkfun board only works while in DFU mode. After uploading my firmware if I reset, the blue led flashes briefly and fades out quickly, the board appears to turn off. The Arduino serial console shows nothing.
But if i enter DFU mode and restart the console then the board starts and my firmware and BLE works.
This board does not appear to work in anything other than DFU mode. Powering it by battery doesnt work at all. Kind of a bummer.
I will probably try powering the board externally with a 3.3V regulator. But this really shouldn't be necessary. Clearly there is something wrong with this board or the voltage regulator/usb power chip.
No public wish lists :(