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RELATED GUIDES

Using ATSAMD21 SERCOM for more SPI, I2C and Serial ports
Get more high speed serial commports without bitbanging
by lady ada
When we first checked out the ATSAMD21 chip (the processor used in the Arduino Zero and Adafruit Feather M0), we were very happy to see that the chip has 6 "SERCOM"s, a.k.a SERial COMmunication modules. Each one of these modules can be used for I2C, SPI or Serial. That means you can have 3 UART's & 3 SPI's, or maybe 2 SPI's and 4 I2C's. Basically, you have a ton of options for adding more hardware support for the most common 3 chip-to-chip protocols.
MicroPython for SAMD21
How to use MicroPython with boards like the Feather M0 & Arduino Zero!
by Tony DiCola
Learn about Adafruit's SAMD21 MicroPython port which allows boards like the Feather M0 and Arduino Zero to run MicroPython!
MicroPython Hardware: SSD1306 OLED Display
How to use a SSD1306 OLED display with MicroPython boards.
by Tony DiCola
Learn how to connect a SSD1306 OLED display to a MicroPython board and control it with a simple MicroPython module. Focuses on MicroPython for the ESP8266 and SAMD21.
Using Bluefruit BLE to Give Disabled Users Switch Control Access to IOS Devices
Build an inexpensive Bluetooth device to give a disable user access to their iPad or iPhone
by Chris Young
A physical disability can make it impossible to operate a touchscreen device such as an iPhone or iPad. Commercially available switch control devices can cost several hundred dollars but with the power of Adafruit Bluefruit BLE devices you can build an interface for a fraction of that cost. We show you how in this tutorial.