Adafruit Metro ESP32-S3 with 16 MB Flash 8 MB PSRAM

The Adafruit Metro ESP32-S3 brings the powerful dual-core ESP32-S3 to the familiar Metro/UNO shield-compatible form factor. With 16 MB flash, 8 MB PSRAM, and 512 KB SRAM, this board has the memory to handle demanding CircuitPython, Arduino, or ESP-IDF projects with WiFi and Bluetooth LE connectivity.

Native USB support means the Metro ESP32-S3 can act as a keyboard, mouse, MIDI device, or disk drive. A built-in LiPo battery charger and MAX17048 fuel gauge provide complete battery management with voltage and state-of-charge monitoring, while deep sleep mode draws as little as ~100 µA for battery-powered deployments.

Key Features

• ESP32-S3 Dual-Core 240 MHz Processor – With native USB and AI acceleration support
• 16 MB Flash + 8 MB PSRAM + 512 KB SRAM – Massive memory for large buffers and complex applications
• WiFi + Bluetooth LE – 2.4 GHz 802.11 b/g/n and BLE connectivity
• Native USB – Acts as keyboard, mouse, MIDI device, or disk drive
• Metro/UNO Shield Compatible – Standard form factor for plug-in shields
• USB-C + LiPo Battery Power – Dual power options with built-in battery charging
• MAX17048 Battery Monitor – Active voltage and charge percentage tracking over I2C
• Ultra-Low Power Sleep – ~100 µA deep sleep current from LiPo connection
• STEMMA QT / Qwiic Port – Switchable-power I2C connector for low-power modes
• Status LEDs + NeoPixel – On, Charge, and User LEDs with pin-controlled NeoPixel power
• Reset & DFU Buttons – Quick access to ROM bootloader via USB serial
• JTAG 2×5 Header – For advanced debugging
• FCC/CE Certified Module – Ready for product development

Ideal For

• WiFi and BLE IoT projects with shield compatibility
• Battery-powered portable wireless devices
• CircuitPython, Arduino, or ESP-IDF development
• USB HID projects (keyboard, mouse, MIDI)
• AI and machine learning edge applications

Package Contents

• 1× Adafruit Metro ESP32-S3 (with headers)