circuitpython-org/_board/fluff_m0.md

layout	board_id	title	name	manufacturer	board_url	board_image	date_added	family	features
download	fluff_m0	Fluff M0 Download	Fluff M0	Radomir Dopieralski	https://hackaday.io/project/171381-fluff-m0	fluff_m0.jpg	2020-5-22	atmel-samd	USB-C Breadboard-Friendly

A minimal CircuitPython board compatible with the Feather M0 Basic. Everything that is non-essential has been removed, and the smallest possible chip is used.

Project page on hackaday.io

Here are some handy specs!

• Measures 2.0" x 0.9" x 0.28" (51mm x 23mm x 8mm) without headers soldered in
• ATSAMD21E18 @ 48MHz with 3.3V logic/power
• 256KB of FLASH + 32KB of RAM
• No EEPROM
• 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 - 23 GPIO pins
• Hardware Serial, hardware I2C, hardware SPI support
• 8 x 12-bit analog inputs
• 1 x 10-bit analog ouput (DAC)
• Yellow LED for general purpose blinking
• 4 mounting holes

Differences from Feather M0

• No battery charger
• No crystal
• No external flash
• No reset button
• No enable pin, instead you get another GPIO pin
• Two additional analog pins (AREF and A6)
• LED is on a separate, dedicated pin, not on D13
• USB-C PCB socket