UM FeatherS2

Development Board

Code name: FEATHERS2

ESP32S2

UM FeatherS2 is a development board based on the ESP32S2 microcontroller using XTENSA architecture.

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

About UM FeatherS2

Feature-rich ESP32-S2 Feather board with 16MB Flash, 8MB PSRAM, and LiPo charging - great for advanced IoT projects.

Technical Specifications

Complete technical specification details for UM FeatherS2

Connectivity

WiFi 802.11 b/g/n 2.4 GHz

Bluetooth -

BLE -

Microcontroller

Model esp32s2

Clock Speed 240 MHz

Flash Size 16MB

Architecture xtensa

✨ Features & Pins

Digital IO 48

Analog Input 20

PWM 29

Interrupts 46

Quick Setup

Copy-paste configs for UM FeatherS2 - auto‑generated from this board's exact hardware specs.

ESP32S2 240 MHz 16MB DIO Xtensa

In Arduino IDE 2 select Feathers2 from the esp32 by Espressif package. In PlatformIO use board = esp32-s2-saola-1. ESP32S2 · 240 MHz · 16MB · DIO.

Tools menu settings

Board (select in Arduino IDE) Feathers2

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 "Feathers2" for the UM FeatherS2.

platformio.ini


[env:feathers2]
platform  = espressif32
board     = esp32-s2-saola-1
framework = arduino

; Exact hardware config for UM FeatherS2
board_build.mcu        = esp32s2
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-s2-saola-1
  framework:
    type: arduino   # or "esp-idf"

# UM FeatherS2 - 240 MHz ESP32S2
# 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 esp32s2 \
  --baud 921600 \
  write_flash \
    --flash_mode dio \
    --flash_size 16MB \
    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 UM FeatherS2

ESP32S2 Datasheet

Microcontroller reference

Pin Mappings

Complete pinout and GPIO mapping for UM FeatherS2

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Analog	Touch	PWM	Other
1	A0	T1	PWM
2	A1	T2	PWM
3	A2	T3	PWM
4	A3	T4	PWM
5	A4	T5	PWM
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	T13	PWM
14	A13	T14	PWM
15	A14		PWM
16	A15		PWM
17	A16		PWM	DAC1
18	A17		PWM	DAC2
19	A18		PWM
20	A19		PWM
21			PWM	LDO_2_POWER
34			PWM	SS
35			PWM	MOSI SDO
36			PWM	SCK
37			PWM	MISO SDI
40			PWM	APA_DATA
43			PWM	TX
44			PWM	RX
45			PWM	APA_CLK

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 FeatherS2

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)