adafruit-qt-py-samd21

Important Note

This entire repo was AI created - including all of the data within. The intent was to A) help me with my personal electronics inventory; and B) see how I could use AI to make that process a bit easier. DO NOT TRUST!

Adafruit QT Py - SAMD21 Dev Board with STEMMA QT

Details

• Location: Cabinet-1, Bin 26
• Category: Microcontroller Boards
• Type: ARM Development Board with STEMMA QT
• Microcontroller: ATSAMD21E18
• Brand: Adafruit
• Part Number: 4600
• Quantity: 5
• Product URL: https://www.adafruit.com/product/4600

Description

What a cutie pie! Or is it… a QT Py? This diminutive dev board comes with the SAMD21 (as made famous in GEMMA M0 and Trinket M0 boards) and features the innovative chainable STEMMA QT connector for plug-and-play I2C sensor connectivity. Compatible with Seeed Xiao form factor with castellated pads.

Specifications

• Part Number: 4600
• Microcontroller: ATSAMD21E18 ARM Cortex-M0+
• Architecture: 32-bit ARM Cortex-M0+
• Clock Speed: 48MHz
• Operating Voltage: 3.3V
• Flash Memory: 256KB
• RAM: 32KB
• Dimensions: 22.0mm x 17.9mm x 5.9mm
• Weight: 2.3g

Image

Features

• ARM Cortex-M0+: Powerful 32-bit processor at 48MHz
• Native USB: Built-in USB support - can act as keyboard/mouse, MIDI device, disk drive
• STEMMA QT Connector: Plug-and-play I2C sensor connectivity
• USB-C Connector: Modern connector for programming and power
• RGB NeoPixel: Built-in addressable LED with power control
• Xiao Compatible: Same pinout and form factor as Seeed Xiao
• Castellated Pads: Can be soldered directly to PCB
• Reset Button: Easy programming and debugging
• Optional SPI Flash: Footprint for SOIC-8 SPI Flash chip

Pin Configuration

• Digital I/O: 11 GPIO pins
• Analog Inputs: 9 pins (12-bit ADC, SDA/SCL do not have analog inputs)
• Analog Output: 1 pin (true analog output, 10-bit quality audio)
• PWM: 9 pins (A0 is analog out, A1 is not PWM capable)
• I2C: Hardware I2C port with STEMMA QT connector
• SPI: Hardware SPI
• UART: Hardware UART
• I2S: Hardware I2S
• Capacitive Touch: 6 pins with no additional components

Power Specifications

• Operating Voltage: 3.3V
• Input Voltage: 5V (USB-C) or 3.3V (VCC pin)
• Regulator: 3.3V with 600mA peak output
• Current Consumption:
  • Active: ~25mA (typical operation)
  • Sleep: Low power modes available
• Battery Support: Can be powered from external battery

Applications

• STEMMA QT sensor networks
• USB HID devices (keyboard, mouse, MIDI)
• Wearable electronics projects
• Arduino projects requiring small form factor
• CircuitPython learning projects
• Portable data loggers
• Interactive art installations
• Educational microcontroller projects

Programming

• Arduino IDE: Full support with SAMD board package
• CircuitPython: Native support with USB drive functionality
• USB Programming: No external programmer needed
• Libraries: Extensive Arduino and CircuitPython libraries
• Audio: Can play 10-bit quality audio clips in Arduino

STEMMA QT Ecosystem

• Plug-and-Play: No soldering required for I2C sensors
• Chainable: Multiple sensors can be daisy-chained
• Compatible: Works with SparkFun Qwiic and Seeed Grove I2C
• Extensive: Large ecosystem of compatible sensors and displays

Advantages

• Native USB: Advanced USB functionality built-in
• Compact Size: Tiny form factor for space-constrained projects
• Easy Connectivity: STEMMA QT eliminates wiring complexity
• Dual Programming: Arduino IDE and CircuitPython support
• Rich I/O: True analog output and extensive GPIO options
• Educational: Perfect for learning ARM microcontrollers

Hardware Features

• RGB NeoPixel: Built-in with controllable power pin for ultra-low power
• Reset Button: Convenient for restarting programs or entering bootloader
• USB-C: Modern connector, more durable than micro USB
• Castellated Pads: Professional PCB mounting capability
• Optional Flash: Footprint for additional SPI flash storage

Comparison with Other Boards

• vs Arduino Uno: 32-bit ARM vs 8-bit AVR, native USB, smaller size
• vs ESP32 variants: No wireless but native USB, simpler for beginners
• vs XIAO SAMD21: Similar specs but different manufacturer and STEMMA QT

Notes

• Perfect introduction to ARM Cortex-M0+ microcontrollers
• Native USB support enables advanced interfacing capabilities
• STEMMA QT connector makes sensor integration effortless
• Compatible with Xiao ecosystem accessories
• Excellent for educational projects and learning
• CircuitPython support makes it beginner-friendly
• Can be expanded with optional SPI flash for more storage

Tags

microcontroller, arm, cortex-m0+, samd21, qt-py, stemma-qt, usb-c, adafruit, arduino, circuitpython