{"title":"Adafruit Metro M4 Express AirLift (WiFi) - Lite","handle":"adafruit-metro-m4-express-airlift-wifi-lite","url":"/products/adafruit-metro-m4-express-airlift-wifi-lite","description":"The Adafruit Metro M4 Express AirLift combines the powerful ATSAMD51J19 ARM Cortex M4 processor with an on-board ESP32 WiFi co-processor — all in the standard Metro/UNO shield-compatible form factor. With 120 MHz clock speed, floating point support, and built-in TLS/SSL for secure connections, this board makes IoT projects fast and straightforward in both CircuitPython and Arduino.\n\nThe AirLift ESP32 co-processor handles WiFi communication over SPI, with pre-loaded root certificates and plenty of RAM for socket connections. CircuitPython's built-in JSON parsing and requests-compatible library make secure IoT projects remarkably easy to build.\n\nKey Features\n\n\nATSAMD51J19 Cortex M4 @ 120 MHz – With floating point and DSP instructions\n\n512 KB Flash + 192 KB RAM – Ample space for complex applications\n\nAirLift ESP32 WiFi Co-Processor – TLS/SSL support with pre-loaded root certificates\n\nNative USB – Serial, HID keyboard/mouse support with no additional hardware\n\n2 MB QSPI Flash – On-board storage for CircuitPython scripts or Arduino data logging\n\n25 GPIO Pins – 8 analogue inputs, 2 true analogue outputs (DAC), 22 PWM outputs\n\n6× Hardware SERCOM – Configurable as I2C, SPI, or UART\n\nStereo I2S – Audio input/output with MCK pin\n\nBuilt-In Crypto – AES-256, true RNG, and public key controller\n\nUNO Shield Compatible – Standard Metro form factor\n\nFlexible Power – 7–9V DC (polarity protected) or Micro USB, with auto-switching and on/off switch\n\nUF2 Bootloader – Drag-and-drop firmware updates via USB storage mode\n\nStatus LEDs + NeoPixel – Power, RX/TX, red LED, and RGB NeoPixel\n\n3.3V Logic – All I/O at 3.3V\n\n\nIdeal For\n\nSecure WiFi IoT projects with CircuitPython or Arduino\nData dashboards and web-connected displays\nProjects needing high-performance processing with wireless connectivity\nAudio projects using I2S and DSP capabilities\n\n\nPackage Contents\n\n1× Adafruit Metro M4 Express AirLift (WiFi) - Lite (fully assembled with headers)\n\n\nResources\n\nUF2 Bootloader Guide (Adafruit Learn)\n","vendor":"Adafruit","product_type":"physical","in_stock":true,"options":[],"variants":[{"id":5284,"title":"Default Title","sku":"AF-4000","price":72.1,"on_sale":false,"in_stock":true,"available_quantity":100,"option1":"Default Title"}]}