Introducing the Adafruit nRF52840 Feather by lady ada published January 02, 2019, last edited February 11, 2025 last major update July 27, 2022 posted in CircuitPython Feather/ Feather Boards Internet of Things - IOT/ Bluefruit / BLE Save New Favorite × Please sign in to include this guide in your list of favorites. You will be redirected back to this guide once you sign in, and can then save this guide as one of your favorites. Download Overview Update Bootloader Use UF2 Use Arduino IDE Use Command Line Pinouts Power Management Assembly Arduino Support Setup Arduino Board Testing Arduino BLE Examples Advertising: Beacon BLE UART: Controller Custom: HRM BLE Pin I/O Central BLEUART Dual Roles BLEUART Custom: Central HRM Arduino Bluefruit nRF52 API AdafruitBluefruit BLEGap BLEAdvertising BLEScanner BLEService BLECharacteristic BLEClientService BLEClientCharacteristic BLEDiscovery BLEDis BLEUart BLEClientUart BLEBeacon BLEMidi BLEHidAdafruit BLEAncs BLEClientCts BLECentral nRF52 ADC CircuitPython for Feather nRF52840 Welcome to CircuitPython CircuitPython Pins and Modules Frequently Asked Questions Getting Started with BLE and CircuitPython CircuitPython Essentials Memory Map Software Resources Downloads Using nRF52840 SPI on Battery Power FAQs Single page Feedback? Corrections? Primary Products Adafruit Feather nRF52840 Express $24.95 Add to Cart Featured Products view all Adafruit Feather nRF52840 Express $24.95 Add to Cart SEGGER J-Link BASE - JTAG/SWD Debugger $499.95 Add to Cart SEGGER J-Link EDU Mini - JTAG/SWD Debugger $59.95 Add to Cart 10-pin 2x5 Socket-Socket 1.27mm IDC (SWD) Cable - 150mm long $2.95 Add to Cart JTAG (2x10 2.54mm) to SWD (2x5 1.27mm) Cable Adapter Board $4.95 Add to Cart Lithium Ion Polymer Battery Ideal For Feathers - 3.7V 400mAh $6.95 Add to Cart Lithium Ion Polymer Battery - 3.7v 500mAh $7.95 Add to Cart 97 Intermediate Product guide CircuitPython Essentials Page last edited January 31, 2019 Text editor powered by tinymce. Getting Started with BLE and CircuitPython Memory Map