https://learn.adafruit.com/introducing-the-adafruit-nrf52840-feather/bleclientcts
BLEClientCts | Introducing the Adafruit nRF52840 Feather | Adafruit Learning System
The Adafruit Feather nRF52840 Express is the new Feather family member with Bluetooth Low Energy and native USB support featuring the nRF52840! It's our take...
introducingadafruitfeatherlearningsystem