Adafruit Circuit Playground Express Development Board – 3.3V, 48MHz

The Adafruit Circuit Playground Express Development Board – 3.3V, 48MHz is an all-in-one microcontroller development platform designed to make electronics, programming, and embedded systems development more accessible. Built around the ATSAMD21 ARM Cortex-M0 processor running at 48MHz, the board combines a programmable microcontroller with a wide range of integrated sensors, LEDs, controls, audio, and communication interfaces, reducing the need for multiple external modules in many projects.

The Circuit Playground Express can be programmed using several development environments, including Microsoft MakeCode, CircuitPython, Arduino IDE, and Code.org CS Discoveries. This flexibility makes it suitable for beginners learning programming as well as advanced users developing interactive electronics and embedded applications. The board includes built-in USB connectivity for programming and debugging without requiring an external USB-to-serial adapter.

A major advantage of the Circuit Playground Express is its integrated collection of components. The board includes 10 RGB NeoPixels, a LIS3DH 3-axis accelerometer, temperature sensor, light sensor, MEMS microphone, mini speaker with Class-D amplifier, two push buttons, a slide switch, and infrared transmitter and receiver. These built-in peripherals allow users to create interactive projects without connecting separate sensors for many common functions.

The board also provides 8 general-purpose I/O pins with support for analog input, PWM, I2C, UART, and capacitive touch functions. Its GPIO operates at 3.3V logic, making proper voltage-level compatibility important when connecting external components. The board includes 2MB of SPI Flash storage, primarily useful for storing CircuitPython code and libraries.

With its compact round form factor of approximately 50.6mm in diameter, alligator-clip-friendly pads, and multiple built-in peripherals, the Circuit Playground Express is well suited for STEM education, wearable electronics, interactive prototypes, sensor-based projects, robotics experiments, and rapid embedded development.

Features

• ATSAMD21 ARM Cortex-M0 processor running at 48MHz

• 3.3V logic and operating architecture

• 10 individually addressable RGB NeoPixels

• Built-in LIS3DH 3-axis accelerometer

• Integrated temperature and light sensors

• Built-in MEMS microphone and mini speaker

• Two programmable push buttons and slide switch

• Infrared transmitter and receiver

• 8 general-purpose I/O pins

• Supports I2C, UART, analog input, PWM, and capacitive touch

• 2MB SPI Flash storage

• Native Micro-USB programming and debugging

• Supports MakeCode, CircuitPython, Arduino IDE, and Code.org

Specifications

• Brand: Adafruit

• Product: Circuit Playground Express

• Processor: ATSAMD21 ARM Cortex-M0

• Clock Speed: 48MHz

• Logic Voltage: 3.3V

• Flash Storage: 2MB SPI Flash

• RGB LEDs: 10 × NeoPixels

• Accelerometer: LIS3DH 3-axis accelerometer

• Microphone: MEMS microphone

• Speaker: Mini speaker with Class-D amplifier

• Communication: I2C, UART

• USB Interface: Micro-USB

• GPIO: 8 general-purpose I/O pins

• Dimensions: Approximately 50.6mm diameter

• Weight: 8.9g

• Programming Platforms: MakeCode, CircuitPython, Arduino IDE, Code.org

Applications

• STEM and electronics education

• Arduino and CircuitPython projects

• Embedded systems development

• Wearable electronics

• Interactive prototypes

• Sensor-based projects

• Robotics experiments

• Motion-controlled projects

• LED and lighting projects

• Audio and sound-reactive applications

• IoT and connected electronics prototypes