UM FeatherS3

Development Board FEATHERS3

UM FeatherS3 is a development board based on the ESP32S3 microcontroller using XTENSA architecture.

This board features a maximum CPU frequency of 240 MHz and 16MB flash memory.

240 MHz CPU 16MB Flash WiFi + BT 5.0

About UM FeatherS3

ESP32S3 Xtensa dual-core 32-bit LX7 · 240 MHz

A Feather-format ESP32-S3 board with 16MB Flash and 8MB PSRAM, offering USB-C connectivity and support for various peripherals.

Technical Specifications

Complete technical specification details for UM FeatherS3

ESP32S3 · Dual-Core + AI

Arch

XTENSA

Clock

240 MHz

Flash

16MB

Connectivity

WiFi

802.11 b/g/n (2.4 GHz)

Bluetooth 5.0

Classic + BLE

Digital IO

Analog In

PWM

Interrupts

Quick Setup

Copy-paste configs for UM FeatherS3 - auto‑generated from this board's exact hardware specs.

ESP32S3 240 MHz 16MB DIO Xtensa

In Arduino IDE 2 select Feathers3 from the esp32 by Espressif package. In PlatformIO use board = esp32-s3-devkitm-1. ESP32S3 · 240 MHz · 16MB · DIO.

Tools menu settings

Board (select in Arduino IDE) Feathers3

CPU Frequency 240 MHz

Flash Size 16MB

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 "Feathers3" for the UM FeatherS3.

platformio.ini


[env:feathers3]
platform  = espressif32
board     = esp32-s3-devkitm-1
framework = arduino

; Exact hardware config for UM FeatherS3
board_build.mcu        = esp32s3
board_build.f_cpu      = 240000000L
board_build.flash_size = 16MB
board_build.flash_mode = dio
board_upload.flash_size = 16MB

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

esp32: block (YAML)


esp32:
  board: esp32-s3-devkitc-1
  framework:
    type: arduino   # or "esp-idf"

# UM FeatherS3 - 240 MHz ESP32S3
# Flash: 16MB | USB: N/A

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

esptool.py - flash command


esptool.py \
  --chip esp32s3 \
  --baud 921600 \
  write_flash \
    --flash_mode dio \
    --flash_size 16MB \
    0x0 bootloader.bin \
    0x8000    partitions.bin \
    0xe000    boot_app0.bin \
    0x10000   firmware.bin

Install: pip install esptool - replace firmware.bin with your binary - bootloader at 0x0

Useful Links

Datasheets and resources for UM FeatherS3

ESP32S3 Datasheet

Microcontroller reference

Pin Mappings

Complete pinout and GPIO mapping for UM FeatherS3

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Analog	Touch	PWM	Other
1	A0	T1	PWM
2	A1		PWM	VBAT_SENSE
3	A2	T3	PWM
4	A3		PWM
5	A4	T5	PWM	SS
6	A5	T6	PWM
7	A6	T7	PWM
8	A7	T8	PWM	SDA
9	A8	T9	PWM	SCL
10	A9	T10	PWM
11	A10	T11	PWM
12	A11	T12	PWM
13	A12		PWM	LED_BUILTIN LED
14		T14	PWM
34			PWM	VBUS_SENSE
35			PWM	MOSI SDO
36			PWM	SCK
37			PWM	MISO SDI
39			PWM	RGB_PWR LDO2
40			PWM	RGB_DATA
43			PWM	TX
44			PWM	RX

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 UM FeatherS3

Setting	Value
Bootloader tool	esptool_py
Uploader tool	esptool_py
Network uploader tool	esp_ota
Bootloader address	`0x0`
Flash mode	dio
Boot mode	qio
PSRAM type	qspi
Maximum upload size	1280 KB (1310720 bytes)
Maximum data size	320 KB (327680 bytes)

Configuration Summary

The UM FeatherS3 uses esptool_py for uploads , esp_ota for OTA updates, and esptool_py bootloader at 0x0.

Flash mode: dio | Boot mode: qio | PSRAM: qspi

Max sketch size: 1280 KB | Max data size: 320 KB

Similar Boards

Other development boards with ESP32S3 microcontroller

Adafruit Feather ESP32-S3 No PSRAM

ESP32S3 XTENSA

Adafruit Feather ESP32-S3 No PSRAM development board is based on esp32s3 microcontroller and uses xtensa...

View Board Details

CYD ESP32-8048S050

ESP32S3 XTENSA

CYD ESP32-8048S050 development board is based on esp32s3 microcontroller and uses xtensa architecture.

View Board Details

Deneyap Kart 1A v2

ESP32S3 XTENSA

Deneyap Kart 1A v2 development board is based on esp32s3 microcontroller and uses xtensa architecture.

View Board Details

UM FeatherS3

About UM FeatherS3

Technical Specifications

Quick Setup

Useful Links

Pin Mappings

Default Tools & Configuration

Similar Boards

Adafruit Feather ESP32-S3 No PSRAM

CYD ESP32-8048S050

Deneyap Kart 1A v2

Contents