Adafruit Metro ESP32-S3 (16MB Flash 8MB PSRAM)

Board
by Adafruitadafruit-metro-esp32-s3≈ medium (~$15–50)

Also known as: METRO_ESP32S3

Verify my boardCompareEdit on GitHub
Adafruit Metro ESP32-S3 (16MB Flash 8MB PSRAM) board
Board
Adafruit Metro ESP32-S3 (16MB Flash 8MB PSRAM) pinout
Pinout

Specifications

Radiosinherited from ESP32-S3

Wi-Fi
Wi-Fi 4 · 2.4 GHz
Bluetooth LE
BLE 5
Bluetooth Classic
no
802.15.4
no

USB

Native USB
yes
Connector
usb-c
Bridge chip
none — SoC native USB

Board

Form factor
metro
Battery connector
yes
Charging
yes

Display & extras

Extras
rgb-ledstemma-qt
Built onAdafruit Metro ESP32-S3 (16MB Flash 8MB PSRAM) BoardESP32-S3 SoC

Arduino Uno-form-factor ESP32-S3 board with native USB-C, 16 MB flash / 8 MB PSRAM, LiPoly charging, and STEMMA QT.

Firmware for this board

No firmware recipes yet — help add one.

Notes

  • 16 MB flash, 8 MB Octal PSRAM, 512 KB SRAM
  • LiPoly battery connector with built-in charging; MAX17048 I2C battery monitor
  • STEMMA QT connector with switchable power; JTAG 2x5 debug header; Revision B (Nov 2023) fixed NeoPixel/SPI/SD-card pin conflicts with PSRAM
  • Dimensions not specified on the product page (omitted)
  • io.power_out QUOTED: vendor page states "This is the output pin from the 3.3V regulator, you can grab up to 400mA from this regulator for accessories, it's also used by the ESP32-S3 which can have spiky current draw."
  • io.gpio_exposed=25 QUOTED: vendor pinouts page lists RX/TX (D0/D1), D2-D13 (12 digital pins), A0-A5 (6 analog), SCL/SDA (I2C), and SCK/MOSI/MISO (ICSP header) = 25 GPIO-capable pads. io.gpio_free=24 DERIVED: cross-referencing the vendor firmware repo's own CircuitPython board pin-definition (pins.c) maps every header pad to a GPIO -- of esp32-s3's soc.reserved_pins, only GPIO3 (D3, strapping) is exposed; the onboard MicroSD slot shares the same ICSP SCK/MOSI/ MISO bus (not exclusive) but its SD_CS (GPIO45, itself strapping) is a dedicated internal signal with no header pad, and NeoPixel (GPIO46) is likewise off-header -- so 25 - 1 = 24
  • usb_serial derived from usb.bridge (native) + soc usb.type otg-full-speed + serial-jtag

Verify my board

Reads the connected chip over USB and checks it against what esp-atlas cites for Adafruit Metro ESP32-S3 (16MB Flash 8MB PSRAM) — over Web Serial, no backend, nothing leaves your browser.

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Serial monitor

Not connected.