Adafruit QT Py SAMD21 by Kattni Rembor published September 30, 2020, last updated March 03, 2023 posted in Adafruit Products Microcontrollers Programming/ MicroPython / CircuitPython STEMMA Save New Favorite × Please sign in to include this guide in your list of favorites. You will be redirected back to this guide once you sign in, and can then save this guide as one of your favorites. Download Overview Update the UF2 Bootloader Pinouts About STEMMA QT What is CircuitPython? CircuitPython Installing the Mu Editor Creating and Editing Code Connecting to the Serial Console Interacting with the Serial Console The REPL CircuitPython Libraries Frequently Asked Questions Troubleshooting "Uninstalling" CircuitPython Welcome to the Community! CircuitPython Essentials CircuitPython Pins and Modules CircuitPython Built-Ins CircuitPython Digital In & Out CircuitPython Analog In CircuitPython Analog Out CircuitPython Audio Out CircuitPython PWM CircuitPython Servo CircuitPython Cap Touch CircuitPython Internal RGB LED CircuitPython NeoPixel CircuitPython DotStar CircuitPython UART Serial CircuitPython I2C CircuitPython HID Keyboard and Mouse CircuitPython Storage CircuitPython CPU Temp CircuitPython Expectations Arduino IDE Setup Using with Arduino IDE NeoPixel Blink Adapting Sketches to M0 & M4 UF2 Bootloader Details Downloads Single page Feedback? Corrections? Primary Products Your browser does not support the video tag. Adafruit QT Py - SAMD21 Dev Board with STEMMA QT $7.50 Add to Cart Featured Products view all Your browser does not support the video tag. Adafruit QT Py - SAMD21 Dev Board with STEMMA QT $7.50 Add to Cart STEMMA QT / Qwiic JST SH 4-pin Cable - 100mm Long $0.95 Add to Cart STEMMA QT / Qwiic JST SH 4-Pin Cable - 50mm Long Out of Stock STEMMA QT / Qwiic JST SH 4-Pin Cable - 200mm Long $1.25 Add to Cart USB Type C Cable with Data/Charge Switch $4.95 Add to Cart USB Type A to Type C Cable - 6" long $2.95 Add to Cart USB Type A to Type C Cable - 1ft - 0.3 meter $3.95 Add to Cart USB Type A to Type C Cable - approx 1 meter / 3 ft long $4.95 Add to Cart 104 Updated Beginner Product guide Downloads Files ATSAMD21 Datasheet Webpage for the ATSAMD21E18 (main chip used) EagleCAD files on GitHub Fritzing object in the Adafruit Fritzing Library 3D models on GitHub PDF for QT Py Board Diagram on GitHub SVG for QT Py Board Diagram Schematic & Fabrication Print Text editor powered by tinymce. UF2 Bootloader Details