UM TinyS3

Development Board

Code name: TINYS3

UM TinyS3 is a development board based on the ESP32S3 microcontroller using XTENSA architecture.

This board features a maximum CPU frequency of 240 MHz and 8MB flash memory.

About UM TinyS3

A compact development board from Unexpected Maker, offering wireless connectivity and ample Flash and PSRAM in a small form factor.

Technical Specifications

Complete technical specification details for UM TinyS3

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 8MB

Architecture xtensa

✨ Features & Pins

Digital IO 17

Analog Input 9

PWM 19

Interrupts 46

Quick Setup

Copy-paste configs for UM TinyS3 - auto‑generated from this board's exact hardware specs.

ESP32S3 240 MHz 8MB DIO Xtensa

In Arduino IDE 2 select Tinys3 from the esp32 by Espressif package. In PlatformIO use board = esp32-s3-devkitm-1. ESP32S3 · 240 MHz · 8MB · DIO.

Tools menu settings

Board (select in Arduino IDE) Tinys3

CPU Frequency 240 MHz

Flash Size 8MB

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 "Tinys3" for the UM TinyS3.

platformio.ini


[env:tinys3]
platform  = espressif32
board     = esp32-s3-devkitm-1
framework = arduino

; Exact hardware config for UM TinyS3
board_build.mcu        = esp32s3
board_build.f_cpu      = 240000000L
board_build.flash_size = 8MB
board_build.flash_mode = dio
board_upload.flash_size = 8MB

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 TinyS3 - 240 MHz ESP32S3
# Flash: 8MB | 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 8MB \
    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 TinyS3

ESP32S3 Datasheet

Microcontroller reference

Pin Mappings

Complete pinout and GPIO mapping for UM TinyS3

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			PWM	VBAT_SENSE
17			PWM	RGB_PWR
18			PWM	RGB_DATA
33			PWM	VBUS_SENSE
34			PWM	SS
35			PWM	MOSI SDO
36			PWM	SCK
37			PWM	MISO SDI
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 TinyS3

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)