Adafruit ESP32 Feather

Development Board

Code name: FEATHER_ESP32

ESP32 ADAFRUIT

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

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

About Adafruit ESP32 Feather

Feather-format ESP32 board with LiPo charging - great for wireless projects using CircuitPython or Arduino.

Technical Specifications

Complete technical specification details for Adafruit ESP32 Feather

Connectivity

WiFi 802.11 b/g/n (2.4 GHz)

Bluetooth 4.2

BLE 4.2

Microcontroller

Model esp32

Clock Speed 240 MHz

Flash Size 4MB

Architecture xtensa

✨ Features & Pins

Digital IO 40

Analog Input 16

PWM 17

Interrupts 16

Quick Setup

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

ESP32 240 MHz 4MB DIO Xtensa

In Arduino IDE 2 select Feather Esp32 from the esp32 by Espressif package. In PlatformIO use board = esp32dev. ESP32 · 240 MHz · 4MB · DIO.

Tools menu settings

Board (select in Arduino IDE) Feather Esp32

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 "Feather Esp32" for the Adafruit ESP32 Feather.

platformio.ini


[env:featheresp32]
platform  = espressif32
board     = esp32dev
framework = arduino

; Exact hardware config for Adafruit ESP32 Feather
board_build.mcu        = esp32
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: esp32dev
  framework:
    type: arduino   # or "esp-idf"

# Adafruit ESP32 Feather - 240 MHz ESP32
# 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 esp32 \
  --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

Useful Links

Datasheets and resources for Adafruit ESP32 Feather

ESP32 Datasheet

Microcontroller reference

Pin Mappings

Complete pinout and GPIO mapping for Adafruit ESP32 Feather

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Analog	Touch	PWM	Other
4	A5	T0	PWM
5			PWM	SCK
12	A11	T5	PWM
13	A12	T4	PWM	LED_BUILTIN
14	A6	T6	PWM
15	A8	T3	PWM
16			PWM	RX
17			PWM	TX
18			PWM	MOSI
19			PWM	MISO
22			PWM	SCL
23			PWM	SDA
25	A1		PWM	DAC1
26	A0		PWM	DAC2
27	A10	T7	PWM
32	A7	T9	PWM
33	A9	T8	PWM	SS
34	A2
35	A13			BATT_MONITOR
36	A4
39	A3

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 ESP32 Feather

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