A LoRa radio node supplied by Dani. Consists of two boards which can be soldered together directly: An nRF52840 board, in nice!nano / promicro format, and an SX1262 board with two buttons.

• https://github.com/joric/nrfmicro/wiki/Alternatives
• https://github.com/NomDeTom/NiceRa/tree/main/Sidekick%20Breakout%20V2.1

Flashing can be done by dragging a .uf2 file to the drive that appears on USB connection. However, this did not work for me initially. Bootloader was version 0.6.0. I upgraded this to 0.9.2 and then the latest meshtastic image was recognised and programmed.

Bootloader can be updated with serial dfu tool from adafruit, or by copying these files to the USB drive in this order:

• https://github.com/adafruit/Adafruit_nRF52_Bootloader/releases/download/0.9.2/nice_nano_bootloader-0.9.2_s140_6.1.1.hex
• https://github.com/adafruit/Adafruit_nRF52_Bootloader/releases/download/0.9.2/update-nice_nano_bootloader-0.9.2_nosd.uf2

Firmware image is called: “NRF52 Pro-micro DIY”, available on the github releases page.

I measured when running meshtastic 2.6.11 from supplied image, LEDs disabled, not transmitting.

I think I used a different nRF board from the one Dani supplied. They look very similar, but this one says C3 on the aerial chip.

Supplied on battery terminals:

• 3.32V: 8.7mA
• 4.20V: 7.9mA

3.3V to 3.3V pin on board: 8.6 mA.

5V supplied on USB port: 9.55mA or 10.05mA, with bluetooth connected or not respectively. Blue LED flashes rapidly.

3.3V on USB port: 9.49mA. Same with bluetooth connected. LED not flashing.

Current draw reduces by about 600uA from these numbers when connected to phone by bluetooth, which happened about 35 seconds after power on.