Adafruit Feather ESP32-S2

Development Board

Code name: ADAFRUIT_FEATHER_ESP32S2

ESP32S2 ADAFRUIT

Adafruit Feather ESP32-S2 is a development board based on the ESP32S2 microcontroller using XTENSA architecture.

This board features a maximum CPU frequency of 240 MHz and 4MB flash memory.

About Adafruit Feather ESP32-S2

ESP32-S2 Feather board with USB-C and STEMMA QT - ideal for secure, battery-powered IoT projects.

Technical Specifications

Complete technical specification details for Adafruit Feather ESP32-S2

Connectivity

WiFi 802.11 b/g/n 2.4 GHz

Bluetooth -

BLE -

Microcontroller

Model esp32s2

Clock Speed 240 MHz

Flash Size 4MB

Architecture xtensa

✨ Features & Pins

Digital IO 48

Analog Input 20

PWM 25

Interrupts 46

Quick Setup

Copy-paste configs for Adafruit Feather ESP32-S2 - auto‑generated from this board's exact hardware specs.

ESP32S2 240 MHz 4MB DIO Xtensa

In Arduino IDE 2 select Adafruit Feather Esp32s2 from the esp32 by Espressif package. In PlatformIO use board = esp32-s2-saola-1. ESP32S2 · 240 MHz · 4MB · DIO.

Tools menu settings

Board (select in Arduino IDE) Adafruit Feather Esp32s2

CPU Frequency 240 MHz

Flash Size 4MB

Flash Mode DIO

Upload Speed 921600

Architecture Xtensa

In Arduino IDE 2, open Boards Manager, search "esp32" by Espressif and install it. Then go to Tools → Board and select "Adafruit Feather Esp32s2" for the Adafruit Feather ESP32-S2.

platformio.ini


[env:adafruit_feather_esp32s2]
platform  = espressif32
board     = esp32-s2-saola-1
framework = arduino

; Exact hardware config for Adafruit Feather ESP32-S2
board_build.mcu        = esp32s2
board_build.f_cpu      = 240000000L
board_build.flash_size = 4MB
board_build.flash_mode = dio
board_upload.flash_size = 4MB

The board value is a close generic match - check PlatformIO board registry for an exact fit.

esp32: block (YAML)


esp32:
  board: esp32-s2-saola-1
  framework:
    type: arduino   # or "esp-idf"

# Adafruit Feather ESP32-S2 - 240 MHz ESP32S2
# Flash: 4MB | USB: N/A

Paste into your device's .yaml. See ESPHome ESP32 docs for full options.

esptool.py - flash command


esptool.py \
  --chip esp32s2 \
  --baud 921600 \
  write_flash \
    --flash_mode dio \
    --flash_size 4MB \
    0x1000 bootloader.bin \
    0x8000    partitions.bin \
    0xe000    boot_app0.bin \
    0x10000   firmware.bin

Install: pip install esptool - replace firmware.bin with your binary - bootloader at 0x1000

Adafruit Feather ESP32-S2 Pinout Diagram

Complete pin reference for Adafruit Feather ESP32-S2

Useful Links

Datasheets and resources for Adafruit Feather ESP32-S2

ESP32S2 Datasheet

Microcontroller reference

Pin Mappings

Complete pinout and GPIO mapping for Adafruit Feather ESP32-S2

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Analog	Touch	PWM	Other
1			PWM	NEOPIXEL_NUM
3			PWM	SDA
4			PWM	SCL
5		T5	PWM
6		T6	PWM
7			PWM	I2C_POWER
8	A5	T8	PWM
9		T9	PWM
10		T10	PWM
11		T11	PWM
12		T12	PWM
13		T13	PWM	LED_BUILTIN
14	A4	T14	PWM
15	A3		PWM
16	A2		PWM
17	A1		PWM	DAC1
18	A0		PWM	DAC2
21			PWM	NEOPIXEL_POWER
33			PWM
35			PWM	MOSI
36			PWM	SCK
37			PWM	MISO
38			PWM	RX
39			PWM	TX
42			PWM	SS

Legend

A0 Analog input

T0 Touch sensor

PWM PWM capable

RX/TX Serial pins

LED Built-in LED

# Pin number

Default Tools & Configuration

Build and upload settings for Adafruit Feather ESP32-S2

Setting	Value
Bootloader tool	esptool_py
Uploader tool	esptool_py
Network uploader tool	esp_ota
Bootloader address	`0x1000`
Flash mode	dio
Boot mode	qio
Maximum upload size	1280 KB (1310720 bytes)
Maximum data size	320 KB (327680 bytes)