Datasheet

Here's some handy specs!

Measures 2.0" x 0.9" x 0.28" (51mm x 23mm x 8mm) without headers soldered in

Light as a (large?) feather - 4.6 grams

ATSAMD21G18 @ 48MHz with 3.3V logic/power

256KB of FLASH + 32KB of RAM

32.768 KHz crystal for clock generation & RTC

3.3V regulator with 500mA peak current output

USB native support, comes with USB bootloader and serial port debugging

You also get tons of pins - 20 GPIO pins

Hardware Serial, hardware I2C, hardware SPI support

PWM outputs on all pins

6 x 12-bit analog inputs

1 x 10-bit analog output (DAC)

Built in 100mA lipoly charger with charging status indicator LED

Pin #13 red LED for general purpose blinking

Power/enable pin

4 mounting holes

Reset button

The Feather M0 Basic Proto has some extra space left over, so we give you a tiny little prototyping area. If you just

need to attach a button or sensor, you may be able to skip out on a breadboard and wire it directly on there.