AITRIP 2PCS Pro Micro NRF52840 Development Board Wireless Bluetooth Charging Management Module，Nano V2.0 Bluetooth Charging Management Pro Micro NRF52840

Buy a NRF52840 on Amazon: https://a.co/d/08sSnkZG Print this with a 3D printer; the NRF device snaps right in (this is optional): https://www.thingiverse.com/thing:7371668 Plug your NRF52840 and put it into update mode by shorting the GND and RST pins twice quickly. It should now appear as a flash drive. Download the -standard.uf2 file from the OpenPuck releases. Drag and drop the .uf2 file into your NRF52840. One the file transfers, you may need to unplug and replug your NRF52840 into your PC. Use the OpenPuck config tool to connect to and control your OpenPuck! GitHub: https://github.com/safijari/openpuck

On Amazon you can get 5 for $25! This is the exact listing I bought from https://a.co/d/06DqAyT6 If you want less than 4 it will be more like $7 each. https://a.co/d/0ccxlJ0d My guide shows how to do the entire process: https://xrstudios.me/guides/vivadongle

amazon.com/AITRIP-Development-Bluetooth-Management-Module，Nano/dp/B0DCZJKYL1/ This is the cheapest viable amazon listing. You can find the same board on Ali as well.