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Description
Adafruit Feather M0 Express - Designed for CircuitPython - ATSAM#3403 We love all our Feathers equally, but this Feather is very special. It's our first Feather that is specifically designed for use with CircuitPython! CircuitPython is our beginner oriented flavor of MicroPython and as the name hints at, its a small but full featured version of the popular Python programming language specifically for use with circuitry and electronics. Please note, CircuitPython does not come preloaded. See the full guide linked
#3403We love all our Feathers equally, but this Feather is very special. It's our first Feather that is specifically designed for use with CircuitPython! CircuitPython is our beginner-oriented flavor of MicroPython - and as the name hints at, its a small but full-featured version of the popular Python programming language specifically for use with circuitry and electronics.
Please note, CircuitPython does not come preloaded. See the full guide linked below for instructions on installing it.
That doesn't mean you cant also use it with Arduino IDE! At the Feather M0's heart is an ATSAMD21G18 ARM Cortex M0+ processor, clocked at 48 MHz and at 3.3V logic, the same one used in the new Arduino Zero. This chip has a whopping 256K of FLASH (8x more than the Atmega328 or 32u4) and 32K of RAM (16x as much)! This chip comes with built in USB so it has USB-to-Serial program & debug capability built in with no need for an FTDI-like chip.
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 - 5 grams
- ATSAMD21G18 @ 48MHz with 3.3V logic/power
- 256KB of FLASH + 32KB of RAM
- No EEPROM
- 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 ouput (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 Express uses the extra space left over to add a Mini NeoPixel, 2 MB SPI Flash storage and a little prototyping space. You can use the SPI Flash storage like a very tiny hard drive. When used in CircuitPython, the 2 MB flash acts as storage for all your scripts, libraries and files. When used in Arduino, you can read/write files to it, like a little datalogger or SD card, and then with our helper program, access the files over USB.
Easy reprogramming: the Feather M0 comes pre-loaded with the UF2 bootloader, which looks like a USB storage key. Simply drag firmware on to program, no special tools or drivers needed! It can be used to load up CircuitPython, PXT MakeCode or Arduino IDE (it is bossa-compatible)
Comes fully assembled and tested, with the UF2 USB bootloader. We also toss in some header so you can solder it in and plug into a solderless breadboard.
Lipoly battery and USB cable not included (but we do have lots of options in the shop if you'd like!)
Features
- Product Dimensions: 51.0mm x 22.8mm x 7.3mm / 2.0" x 0.9" x 0.3"
- Product Weight: 4.7g / 0.2oz
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4.7 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 5
Stylish shirt
Size: 14"-14.5" Neck 32"-33" Sleeve, Color: Ash Green
Perfect fit and size, as promoted. The quality and feel (comfort) are nice. The color is a little lighter than what I could see on the screen, but I liked it. The shirt is not too thin or thick.
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Reviewed in the United States on December 14, 2025
★★★★★ 5
Price efficient corpo wear!
Size: 14"-14.5" Neck 32"-33" Sleeve, Color: Light Blue
It fits great!
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Reviewed in the United States on March 19, 2026
★★★★★ 3
Fits small is very slim
Size: 15"-15.5" Neck 32"-33" Sleeve, Color: Medium Blue
Fits small and is tight. Don’t listen to reviews that say it’s not slim fit bc its too slim
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Reviewed in the United States on June 3, 2026
★★★★★ 5
Great quality shirt
Size: 16"-16.5" Neck 32"-33" Sleeve, Color: Medium Blue
Fits true to size. Material is good quality and not see through. Color is as advertised. Will be buying more.
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Reviewed in the United States on December 21, 2025
★★★★★ 5
Great shirt! Great price!
Size: 17"-17.5" Neck 34"-35" Sleeve, Color: Medium Blue
These shirts are listed for sale on Amazon with the title "Unlisted by Kenneth Cole men's Slim Fit." To me these shirts aren't "Slim Fit." I have purchased "Slim Fit" shirts in the past from other manufacturers and they were always too tight on me. I'm 6ft and 185 lbs. To me these shirts are more a standard fit and they fit me perfectly.
They are made with a combination of cotton and polyester which means they resist wrinkling. And for about $20 each they are a great deal!
Kenneth Cole also sells their "Unlisted by Kenneth Cole men's Regular Fit" on Amazon. These shirts should be called "Big and Tall" or "Full Size" fit. This is the first shirt I ordered, and they were too big on me. They are mostly for chubby or muscular men.
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Reviewed in the United States on March 12, 2022