{"title":"Adafruit QT Py - SAMD21 Dev Board with STEMMA QT","handle":"adafruit-qt-py-samd21-dev-board-with-stemma-qt","url":"/products/adafruit-qt-py-samd21-dev-board-with-stemma-qt","description":"The Adafruit QT Py SAMD21 is the original QT Py — a tiny development board built around the ATSAMD21E18 (ARM Cortex-M0+ at 48 MHz) with native USB, a STEMMA QT connector, and an RGB NeoPixel. It's the same chip found in the popular Trinket M0 and GEMMA M0, now in a Seeed Xiao-compatible form factor with plug-and-play I2C.\n\nWith native USB support, it shows up as a disk drive for drag-and-drop CircuitPython coding, and can act as a USB keyboard, mouse, MIDI device, or serial console. The STEMMA QT / Qwiic connector gives you solderless I2C access to hundreds of sensors, and castellated pads make it easy to embed in custom PCB designs.\n\nKey Features\n\n\nATSAMD21E18 Processor – 48 MHz ARM Cortex-M0+ with 256 KB flash and 32 KB RAM\n\nNative USB – USB serial console, keyboard/mouse HID, MIDI, and disk drive\n\nUSB-C Connector – For programming, power, and USB device functions\n\nSTEMMA QT / Qwiic Connector – Plug-and-play I2C for sensors and accessories\n\nRGB NeoPixel LED – Built-in with controllable power pin for low-power usage\n\n11 GPIO Pins – 9× 12-bit ADC, 1× true analogue output (DAC), 9× PWM, 6× capacitive touch\n\nHardware I2C, UART, SPI & I2S – Full peripheral support\n\nCircuitPython & Arduino – Full support for both platforms\n\n3.3 V Regulator – AP2112 with 600 mA peak output\n\nOptional SPI Flash – SOIC-8 pads on the bottom for adding external flash storage\n\nReset Button – Quick restart or bootloader entry\n\nSeeed Xiao Compatible – Same size and pinout with castellated pads\n\n\nAlso Consider\n\n\nQT Py RP2040 – Dual-core with 8 MB flash and PIO state machines\n\nQT Py ESP32-S2 – Single-core with Wi-Fi, native USB, and 2 MB PSRAM\n\nQT Py ESP32-S3 – Dual-core with Wi-Fi + BLE and native USB\n\nQT Py ESP32-C3 – RISC-V with Wi-Fi + BLE\n\n\nIdeal For\n\nSimple CircuitPython and Arduino projects\nUSB HID devices (keyboards, mice, MIDI controllers)\nCompact I2C sensor projects with STEMMA QT\nCapacitive touch interfaces\nEmbedding into custom PCBs via castellated pads\n\n\n\nNote: The SAMD21 has no built-in flash storage for files. For datalogging or file storage with CircuitPython, solder an SOIC-8 SPI flash chip onto the bottom pads. The SAMD21 does not have Wi-Fi or Bluetooth.\n\n\nResources\n\nAdafruit QT Py SAMD21 Learning Guide\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":2966,"title":"Default Title","sku":"AF-4600","price":16.47,"compare_at_price":0.0,"on_sale":false,"in_stock":true,"available_quantity":3,"option1":"Default Title"}]}