Adafruit Feather nRF52840 Express


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SKU: 1104418
  • nRF52840 ARM Cortex-M4F processor at 64 MHz
  • 1 MB flash memory and 256 KB of SRAM
  • Battery connector and charger for 3.7 V lithium polymer batteries
  • SWD connector


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Brand: Adafruit
Category: IoT Development Boards
Tags: Feather nRF52840, Adafruit

The Adafruit Feather Bluefruit Sense takes the popular Feather nRF52840 Express and adds a smorgasbord of sensors to make a great wireless sensor platform.

This Feather microcontroller comes with Bluetooth Low Energy and native USB support featuring the nRF52840!  This Feather is an ‘all-in-one’ Arduino-compatible + Bluetooth Low Energy with built-in USB plus battery charging. With native USB it works great with CircuitPython, too.

Like the Feather nRF52840, this chip comes with Arduino IDE support – you can program the nRF52840 chip directly to take full advantage of the Cortex-M4 processor, and then call into the Nordic SoftDevice radio stack when you need to communicate over BLE. Since the underlying API and peripherals are the same for the ‘832 and ‘840, you can supercharge your older nRF52832 projects with the same exact code, with a single recompile!

This Feather is also a BLE-friendly CircuitPython board! CircuitPython works best with disk drive access, and this is the only BLE-plus-USB-native chip that has the memory to handle running a little Python interpreter. The massive RAM and speedy Cortex M4F chip make this a good match. Make centrals or peripherals with the ease of CircuitPython.


  1. ARM Cortex M4F (with HW floating point acceleration) running at 64MH
  2. 1MB flash and 256KB SRAM
  3. Native Open Source USB stack – pre-programmed with UF2 bootloader
  4. Bluetooth Low Energy compatible 2.4GHz radio (Details available in the nRF52840 product specification)
  5. FCC / IC / TELEC certified module
  6. Up to +8dBm output power
  7. 1.7v to 3.3v operation with internal linear and DC/DC voltage regulators
  8. 21 GPIO, 6 x 12-bit ADC pins, up to 12 PWM outputs (3 PWM modules with 4 outputs each)
  9. Pin #3 red LED for general purpose blinking, NeoPixel for colourful feedback
  10. Power/enable pin
  11. Measures 2.0×0.9×0.28″ (51x23x7.2mm) without headers soldered in
  12. 6 grams
  13. 4 mounting holes
  14. Reset button
  15. SWD connector for debugging
  16. Works out of the box with all Adafruit FeatherWings (Even the UART-using ones like the GPS FeatherWing)

Package Includes:

1 x Adafruit Feather nRF52840 Express

SKU: 1104418 Category: Tags: ,
Product Type

Development board

Model Type

nRF52840 ARM Cortex

Operating Voltage (VDC):


Clock Speed


Program Memory Size (kB)


Flash Memory


Shipping Weight 0.01 kg
Shipping Dimensions 10 × 11 × 1 cm
15 Days Warranty

This item is covered with a standard warranty of 15 days from the time of delivery against manufacturing defects only. This warranty is given for the benefit of Robu customers from any kind of manufacturing defects. Replacement will be done against manufacturing defects.

What voids warranty:

If the product is subject to misuse, tampering, static discharge, accident, water or fire damage, use of chemicals & soldered or altered in any way.

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Country Of Origin: United States