Circuit Playground Bluefruit - ALPHA - Bluetooth Low Energy

The Circuit Playground Bluefruit builds on the popular Circuit Playground Express by upgrading to an nRF52840 microcontroller with built-in Bluetooth Low Energy. The round board is packed with sensors, LEDs, and inputs — all accessible via alligator-clip pads with no soldering required.

Program it with CircuitPython, Arduino, or Microsoft MakeCode. Power it from USB, a AAA battery pack, or a LiPo battery. The built-in USB port shows up as a drive for drag-and-drop programming and can also act as a serial port, keyboard, mouse, joystick, or MIDI device.

Onboard Features

• nRF52840 Cortex M4 – With Bluetooth Low Energy support
• 10× Mini NeoPixels – Full RGB, individually addressable
• Motion Sensor – LIS3DH triple-axis accelerometer (tap and free-fall detection)
• Temperature Sensor – Thermistor
• Light Sensor – Phototransistor (also works as colour and pulse sensor)
• Sound Sensor – MEMS microphone
• Mini Speaker – 7.5 mm magnetic speaker with Class D amplifier
• 2× Push Buttons – Labelled A and B
• 1× Slide Switch
• 8× Alligator-Clip I/O Pads – Including I²C, UART, 6 analogue inputs, and PWM outputs
• 2 MB SPI Flash – For CircuitPython code and library storage
• Micro USB Port – Programming, debugging, and USB HID
• Green Power LED and Red #13 LED
• Reset Button

Ideal For

• Learning electronics and programming
• Bluetooth Low Energy projects and wearables
• Interactive art and music installations
• STEM education and workshops