UM FeatherS3

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Development Board

Code name: FEATHERS3

ESP32S3

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.

About UM FeatherS3

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

Connectivity

WiFi 802.11 b/g/n (2.4 GHz)

Bluetooth 5.0

BLE 5.0

Microcontroller

Model esp32s3

Clock Speed 240 MHz

Flash Size 16MB

Architecture xtensa

✨ Features & Pins

Digital IO 21

Analog Input 13

PWM 22

Interrupts 46

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.

Arduino IDE PlatformIO ESPHome esptool

Tools menu settings Copy

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 Copy

[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) Copy

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 Copy

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

](https://www.espressif.com/sites/default/files/documentation/esp32-s3_datasheet_en.pdf)

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