即将发布的Circuit Playground Bluefruit是Circuit Playground Express的升级版，它使用了nRF52840微控制器，支持蓝牙BLE功能。
产品规格
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, 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, multiple PWM outputs
Green “ON” LED so you know its 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
USB port can act like serial port, keyboard, mouse, joystick or MIDI!
https://blog.adafruit.com/2019/07/17/coming-soon-circuit-playground-bluefruit-bluetooth-low-energy/
