Adafruit ESP32-S2 Feather Development Board (5303)
Adafruit ESP32-S2 Feather

Available from:


Install method:
USB to Serial

GPIO #Component
GPIO00 User
GPIO01 None
GPIO02 None
GPIO05 User
GPIO06 User
GPIO07 Output Hi
GPIO08 User
GPIO09 User
GPIO10 User
GPIO11 User
GPIO12 User
GPIO13 User
GPIO14 User
GPIO15 User
GPIO16 User
GPIO17 User
GPIO18 User
GPIO19 None
GPIO20 None
GPIO21 Output Hi
GPIO33 WS2812 1
GPIO34 None
GPIO35 User
GPIO36 User
GPIO37 User
GPIO38 User
GPIO39 User
GPIO40 None
GPIO41 None
GPIO42 None
GPIO43 None
GPIO44 None
GPIO45 None
GPIO46 None
Configuration for ESP32-S2
{"NAME":"ESP32-S2 Feather","GPIO":[1,0,0,640,608,1,1,3840,1,1,1,1,1,1,1,1,1,1,1,0,0,3840,1376,0,1,1,1,1,1,0,0,0,0,0,0,0],"FLAG":0,"BASE":1}

A Feather form factor ESP32-S2 dev board with 1S LiPo battery monitoring and an optional on-board BME280 sensor.

This board uses an ESP32-S2-MINI-1-N4R2 module with 4MB of flash and 2 MB PSRAM.

When the board is booted into debug by holding BOOT and pressing the RESET button the USB-Serial chip on the USB port exposes a serial connection. This can be used to easily flash new firmware.


Flash using Tasmota Web Installer and select Tasmota ESP32-S2 option.

For esptool.py download i.e. tasmota32s2.factory.bin and run esptool.py write_flash 0x0 tasmota32s2.factory.bin

To put ESP32-S2 in flash mode GPIO0 needs to be pulled low.

Device Notes

Adafruit ESP32-S2 Feather Front and Back

Adafruit ESP32-S2 Feather Pinout

Product Guide

PCB Files


  • WS2812B Neopixel
    • On GPIO33 (configured as WS2812) with power on GPIO21 (configured as Output Hi).
  • STEMMA-QT JST-SH I2C bus connector
    • Both ports share the same bus, on GPIO3 (SCL) and GPIO4 (SDA) (configured as I2C 1) and GPIO7 for power (configured as Output Hi). These ports are on the same bus as the SCL and SDA pins labelled on the board.
    • Some early revisions of this board had their I2C power control logic reversed, requiring GPIO7 to be pulled low instead of high to provide power and pull-ups to the I2C bus. If I2C isn’t working, try changing GPIO7 to Output Low
  • BME280 temp/humidity/pressure sensor
    • On I2C bus, supported by Tasmota
  • 1S LiPo battery management subsystem with 2-pin JST-PH connector
    • Includes LC709203 battery monitor IC on I2C bus, not currently supported by Tasmota.