Adafruit nRF52840 Circuit Playground Bluefruit Dev Board

Adafruit nRF52840 Circuit Playground Bluefruit Development Board is the third board in the Circuit Playground series. This breakout board has the nRF52840 microcontroller, which is more powerful and comes with Bluetooth Low Energy support for wireless connectivity. The board is round and has alligator-clip pads around it, so the user doesn't have to solder to make it work. The user can power it from USB, a AAA battery pack, or with a Lipoly battery (for advanced users). Circuit Playground Bluefruit includes built-in USB support. Built-in USB means that it can be plugged in to program it, with no special cable or adapter required. Just program the code into the board and then take it on the go. The user can use this board with Arduino or CircuitPython, but it does not support MakeCode at this time.

Features

1 x nRF52840 Cortex M4 processor with Bluetooth Low Energy support
10 x mini NeoPixels, each one can display any color
1 x Motion sensor (LIS3DH triple-axis accelerometer with tap detection and free-fall detection)
1 x Temperature sensor (thermistor)
1 x Light sensor (phototransistor) (can also act as a color sensor and pulse sensor)
1 x Sound sensor (MEMS microphone)
1 x Mini speaker with class D amplifier (7.5mm magnetic speaker/buzzer)
2 x Push buttons, labeled A and B
1 x Slide switch

8 x alligator-clip friendly input/output pins
Includes I²C, UART, 6 pins that can do analog inputs and multiple PWM outputs
Green "ON" LED, so the user knows it is powered
Red "#13" LED for basic blinking
Reset button
2 MB of SPI Flash storage, used primarily with CircuitPython to store code and libraries
MicroUSB port for programming and debugging
The USB port can act like serial port, keyboard, mouse, joystick or MIDI