Adafruit Feather nRF52840 Sense Board

Adafruit Feather nRF52840 Sense Board is an all-in-one Arduino-compatible and Bluetooth Low Energy (BLE) with built-in USB plus battery charge. This chip comes with Arduino IDE support and the user can program the nRF52840 chip directly to take full advantage of the Cortex-M4 processor. Since the API and peripherals are the same for nRF52832 and nRF52840, users can supercharge the older nRF52832 projects with the same exact code by recompilation. To communicate over BLE the Nordic SoftDevice radio stack can be called. The Feather nRF52840 sense board is also a BLE-friendly CircuitPython board that works best with disk drive access. This board incorporates the only BLE-plus-USB-native chip that has the memory to handle a running Python interpreter. The massive RAM and speedy Cortex M4F chip make this a good match.

Features

ARM Cortex M4F (with HW floating point acceleration) running at 64MHz
1MB flash and 256KB SRAM
Up to +8dBm output power
Native Open Source USB stack - pre-programmed with UF2 bootloader
BLE compatible 2.4GHz radio
FCC / IC / TELEC certified module
21 GPIO, 6 x 12-bit ADC pins, up to 12 PWM outputs (3 PWM modules with 4 outputs each)
Pin #13 red LED for general purpose blinking
Blue LED for general purpose connection status
NeoPixel for colorful feedback
Power/enable pin
4 mounting holes
Reset button

SWD debug pads on the bottom of PCB
Measures 51mm x 23mm x 7.2mm without headers soldered in
Feather weighs about 6 grams
RoHS 2 compliant
Works out of the box with all of Adafruit's FeatherWings (Even the UART-using ones like the GPS FeatherWing)
Supporting sensors surrounding the module helps in environmental and motion-sensing:
- ST Micro series 9-DoF motion - LSM6DS33 Accel/Gyro and LIS3MDL magnetometer
- APDS9960 proximity, light, color, and gesture sensor
- PDM microphone sound sensor
- SHT humidity
- BMP280 temperature and barometric pressure/altitude