Adafruit CLUE - nRF52840 Express with Bluetooth LE

The Adafruit CLUE is a sensor-packed development board built around the Nordic nRF52840 with Bluetooth Low Energy. It matches the BBC micro:bit form factor and edge-connector pinout, making it compatible with existing micro:bit robot kits and add-ons.

Packed with on-board sensors and a 1.3" colour display, the CLUE is designed for projects that measure, log, and visualise environmental data — all without any external wiring. Data can be transmitted over BLE to a computer or mobile device, or saved to the built-in 2MB flash storage.

Key Features

• Nordic nRF52840 – 64 MHz Cortex-M4, 1MB Flash, 256KB RAM, Bluetooth Low Energy
• 1.3" 240×240 Colour IPS TFT Display – High-resolution text and graphics
• 9-DoF Motion – LSM6DS33 accelerometer/gyroscope + LIS3MDL magnetometer
• APDS9960 – Proximity, light, colour, and gesture sensor
• PDM Microphone – Sound sensing and recording
• SHT Humidity Sensor – Relative humidity measurement
• BMP280 – Barometric pressure and temperature
• RGB NeoPixel – Status indicator LED
• Buzzer/Speaker – Tones and audio feedback
• Two White LEDs – Front illumination for colour sensing
• 2MB Internal Flash – For datalogging, images, fonts, or CircuitPython code
• STEMMA QT / Qwiic Connector – Add more I2C sensors, displays, or motor controllers
• Two A/B User Buttons – Plus a reset button
• 3–6V Battery Input – Internal regulator and protection diodes
• micro:bit Form Factor – Same outline and edge-connector for compatibility with micro:bit accessories

Programming

• Arduino IDE
• CircuitPython

Ideal For

• Environmental sensing and datalogging projects
• Wearable BLE projects with on-board display
• Upgrading micro:bit robot kits with advanced sensors
• Learning CircuitPython with built-in peripherals

Package Contents

• 1× Adafruit CLUE nRF52840 Express (Alpha)