We are still shipping! However, order processing may take longer than usual and we cannot guarantee same day shipments due to staffing guidelines from the CDC. Please see all COVID-19 updates here. Thank you for your continued support.

Member #993439

Member Since: May 15, 2017

Country: United States

  • 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 :(