LILYGO T-Echo - Configure Arduino Path; Configure nRF52 Development Environment; Install nRF52 Board Support

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3. Start a Project
3. Configure
Open Arduino, open preferences
-> add https://adafruit.github.io/arduino-board-index/package_adafruit_index.json
to the board installation manager address list
Xinyuan
2022.08
3.1 Install nRF52 Environment
Open the board installation manager, wait for the index update to complete,
select
'Adafruit nRF52 by Adafruit' and click install
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