{"title":"Adafruit MCP2221A Breakout - General Purpose USB to GPIO ADC I2C - Stemma QT / Qwiic","handle":"adafruit-mcp2221a-breakout-general-purpose-usb-to-gpio-adc-i2c-stemma-qt-qwiic","url":"/products/adafruit-mcp2221a-breakout-general-purpose-usb-to-gpio-adc-i2c-stemma-qt-qwiic","description":"The Adafruit MCP2221A Breakout lets your computer talk directly to I2C devices, sensors, and GPIO — no microcontroller required. Drive an OLED display, read a colour sensor, flash LEDs, or read buttons straight from Python on Mac, Windows, or Linux.\n\nThe MCP2221A from Microchip provides USB-to-I2C and USB-to-GPIO functionality with built-in 10-bit ADC inputs and a 5-bit DAC output. Because there's no firmware to deal with, you can quickly iterate and test I2C devices and digital/analogue I/O directly from your computer using CircuitPython libraries.\n\nKey Features\n\n\nUSB to I2C Bridge – Connect I2C sensors, displays, and drivers directly to your computer\n\n4× GPIO Pins – Digital input/output with 10-bit ADC and 5-bit DAC capability\n\nUSB-C Connector – Modern, reversible USB connection\n\nOn-Board 3.3V Regulator – Clean power for connected devices\n\nSTEMMA QT / Qwiic Port – Solderless I2C connection with 3.3V power and logic\n\nCross-Platform Python Support – Works with Mac, Windows, and Linux using CircuitPython libraries\n\nNo Firmware Required – Plug in and start communicating immediately\n\n\nIdeal For\n\nRapid prototyping and testing I2C sensors from a computer\nPython-based hardware projects without a microcontroller\nDesktop automation with GPIO, ADC, and DAC\nEducational projects exploring serial communication protocols\n\n\nPackage Contents\n\n1× Adafruit MCP2221A Breakout board (with STEMMA QT / Qwiic connector)\n\n\n\nTip: Connect any STEMMA QT / Qwiic compatible sensor or display with no soldering required. Grove I2C devices also work with an adapter cable.\n\n\nResources\n\nGetting Started with MCP2221A & Python (Adafruit Learn Guide)\nWhat is STEMMA QT? (Adafruit Learn Guide)\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":4148,"title":"Default Title","sku":"AF-4471","price":12.68,"on_sale":false,"in_stock":true,"available_quantity":1,"option1":"Default Title"}]}