Adafruit ItsyBitsy M0 Express Onboard ATSAMD21 Cortex M0 I2C SPI 23 GPIO Serial with 2MB of SPI Flash for Data Logging File Storage Use for CircuitPython & Arduino IDE 48 MHz 3.3V Logic 3727

It's the same chip as the Arduino Zero and packs much of the same capability as an Adafruit Metro M0 Express or Feather M0 Express but really really small. So it's great once you've finished up a prototype on a Metro M0 or Feather M0, and want to make the project much smaller. It even comes with 2MB of SPI Flash built in, for data logging, file storage, or CircuitPython code.
The most exciting part of the ItsyBitsy M0 is that while you can use it with the Arduino IDE, we are shipping it with CircuitPython on board. When you plug it in, it will show up as a very small disk drive with main.py on it. Edit main.py with your favorite text editor to build your project using Python, the most popular programming language.
Same size, form-factor as the ItsyBisty 32u4, and nearly-indentical pinout as ItsyBitsy 32u4 3.3V.ATSAMD21G18 32-bit Cortex M0+ with 256KB Flash and 32 KB RAM.3.3V logic, 48 MHz, 32 bit processor.
2 MB SPI FLASH chip for storing files and CircuitPython code storage.Native USB supported by every OS - can be used in Arduino or CircuitPython as USB serial console, Keyboard/Mouse HID, even a little disk drive for storing Python scripts.
Can drive NeoPixels or DotStars on any pins, with enough memory to drive 8000+ pixels. DMA-NeoPixel support on the VHigh pin so you can drive pixels without having to spend any processor time on it.

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