Looking for ideas to mount coin battery holder to nrf52840-dongle.

Hi, I ordered the  nrf52840-dongle, but instead of using the USB or external battery to power, I am interested in connecting to a coin battery such as CR2032. I ordered a battery holder, https://www.adafruit.com/product/1870

My question is, do I just wire it directly to the 3v pin or do I need some regulator stuff in between?  Any other solutions? Thanks!

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  • You need to make some changes:

    The nRF52840 Dongle can also be configured to be supplied from an external regulated 1.8–3.6 V source through the VDD OUT connection point. To enable this, SB2 must be cut and SB1 must be soldered.

    CAUTION: Do not have both SB1 and SB2 connected at the same time as this will damage the nRF52840 SoC

Reply
  • You need to make some changes:

    The nRF52840 Dongle can also be configured to be supplied from an external regulated 1.8–3.6 V source through the VDD OUT connection point. To enable this, SB2 must be cut and SB1 must be soldered.

    CAUTION: Do not have both SB1 and SB2 connected at the same time as this will damage the nRF52840 SoC

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