Adafruit Feather nRF52840 Express

The Feather nRF52840 Express is a compact and powerful BLE development board designed for wireless and low power projects. Based on the nRF52840 microcontroller with an ARM Cortex M4F processor, it provides advanced features for Bluetooth Low Energy, IoT devices, and wearable electronics.

With native USB support, the board works directly with Arduino and CircuitPython without requiring additional programming hardware. It also includes extra QSPI flash storage, built in LiPo battery charging, and a NeoPixel status LED, making it ideal for portable and battery powered applications.

Product features

• nRF52840 microcontroller with ARM Cortex M4F
• Bluetooth Low Energy 2.4GHz support
• Native USB support
• 1MB internal flash memory
• 256KB RAM
• 2MB external QSPI flash
• Built in LiPo battery charger
• 21 GPIO pins
• 12-bit ADC support
• PWM, SPI, I2C, UART and I2S interfaces
• NeoPixel status LED
• Reset and user button
• SWD debug connector

Technical specifications

• Processor: ARM Cortex M4F
• Clock speed: 64MHz
• Flash memory: 1MB
• RAM: 256KB
• External flash: 2MB QSPI
• Wireless frequency: 2.4GHz
• GPIO pins: 21
• ADC resolution: 12-bit
• USB: native USB
• Operating voltage: 3.3V
• Battery support: 3.7V LiPo
• Dimensions: 51 x 23 x 7 mm