The ADAFRUIT INDUSTRIES MCU development board has all the basic features shared by all the Feather M0 range boards with a built-in Bluetooth low energy module (BLE). It uses the Bluefruit LE module and has two status indicator LEDs. It has an nRF51822 chipset from Nordic Semiconductor, programmed with multi-function code that opens up a huge range of options. There is a built-in battery charging circuit that enables you to measure and monitor battery levels. It has a standard UART receive/transmit profile and AT command set to have full control over your device. This chip also has a built-in USB port with USB-to-serial programming and debug capability so no need for an FTDI-like chip. The development board is especially designed for low power portable projects.

256KB flash and 32KB RAM (No EEPROM)
32.768kHz crystal for clock generation and RTC
3.3V regulator with 500mA peak current output
USB native support, comes with USB bootloader and serial port debugging
20 GPIO pins
Dedicated connector for 3.7 V lithium batteries
Communication protocols like hardware serial, hardware I²C and hardware SPI support
PWM outputs on all pins
6 x 12-bit analogue inputs
1 x 10-bit analogue output (DAC)
Built-in 100mA LiPo charger with charging status indicator LED
Pin #13 red LED for general purpose blinking
Power/ enable pin
4 mounting holes
Reset button

Embedded development
Educational institutions
Robotics
Internet of things
Human machine interface
Electronics laboratories
Automation

ANSI/ESD S20.20:2014
BS EN 61340-5-1:2007