LilyGo T3S3 V1.0

Development Board

Code name: LILYGO_T3S3_V1_0

LilyGo T3S3 V1.0 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 LilyGo T3S3 V1.0

🚀 The LilyGo T3S3 V1.0 is an ESP32-S3-based development board designed for high-performance applications. With integrated WiFi and Bluetooth 5, it offers seamless wireless connectivity for IoT projects. ⚡

📡 Featuring a compact design, the T3S3 V1.0 is equipped with 8MB PSRAM and 16MB Flash, ensuring sufficient storage and processing power for complex tasks.

💾 The board includes multiple GPIOs, ADC, PWM, I2C, and SPI support, making it suitable for a wide range of embedded applications.

Technical Specifications

Complete technical specification details for LilyGo T3S3 V1.0

Display

Type OLED

Size 0.96"

Resolution 128x64

Driver SSD1306

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

PSRAM 8MB

Architecture xtensa

✨ Features & Pins

Digital IO 48

Analog Input 20

PWM 27

Interrupts 46

Download Full Datasheet

Quick Setup

Copy-paste configs for LilyGo T3S3 V1.0 - auto‑generated from this board's exact hardware specs.

ESP32S3 240 MHz 16MB DIO Xtensa

In Arduino IDE 2 select Lilygo T3s3 V1 0 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) Lilygo T3s3 V1 0

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 "Lilygo T3s3 V1 0" for the LilyGo T3S3 V1.0.

platformio.ini


[env:lilygo_t3s3_v1_0]
platform  = espressif32
board     = esp32-s3-devkitm-1
framework = arduino

; Exact hardware config for LilyGo T3S3 V1.0
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"

# LilyGo T3S3 V1.0 - 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

LilyGo T3S3 V1.0 Pinout Diagram

Complete pin reference for LilyGo T3S3 V1.0

Safe Pins to Use

These pins are safe for general GPIO usage without boot or system conflicts

IO1

IO2

IO16

IO17

IO18

Why Are These Pins Safe?

✓ No boot sequence involvement

✓ No flash/PSRAM connections

✓ No USB or JTAG conflicts

✓ Freely assignable without issues

Pins to Avoid or Use with Caution

Reserved for critical functions. Misuse may cause boot failures, programming issues, or system conflicts.

Strapping Pins

Boot behavior & flash voltage

JTAG Debugging

Low-level debugging interface

USB Pins

USB Serial/JTAG communication

Flash/SPI Pins

Memory & PSRAM connections

UART Serial

Debugging & firmware uploads

PIN	Label	Why Avoid	Type
IO3	GPIO3	Sampled at reset to select JTAG interface (USB Serial/JTAG controller vs. external pins). Improper use can disable external JTAG or alter debug interface.	🛠️ Strapping
IO10	FSPICS0	Used to select the external flash chip. It is required for flash access and cannot be repurposed without losing flash connectivity	⚡ Flash
IO11	FSPID	Used as a data line for flash (and in-package PSRAM). It should not be used as GPIO when the flash/PSRAM is in use.	⚡ Flash
IO12	FSPICLK	Drives the flash (and PSRAM) clock. This critical signal must be reserved for memory and not used as general GPIO.	⚡ Flash
IO13	FSPIQ	Used as a data line for flash/PSRAM transfers. Not available for other uses when flash/PSRAM is connected.	⚡ Flash
IO19	USB_D-	By default connected to the on-chip USB Serial/JTAG controller. Using it as general GPIO without reconfiguring IO MUX will interfere with USB functionality.	🔌 USB

Useful Links

Datasheets and resources for LilyGo T3S3 V1.0

Board Datasheet

Technical specifications

ESP32S3 Datasheet

Microcontroller reference

LilyGo T3S3 V1.0 Custom Pin Mapping

Pin configuration and GPIO mapping for LilyGo T3S3 V1.0

Digital I/O Pins

Interrupt Pins

Analog Inputs

PWM Pins

Pin	Function	ESP Pin	I/O Type	Description
1	3V3	3.3V	POWER OUTPUT	3.3V power output
2	GND	GND	POWER GROUND	Ground connection
3	5V	5V	POWER INPUT	5V power input
4	IO1	GPIO1	BIDIRECTIONAL	GPIO, ADC, I2C
5	IO2	GPIO2	BIDIRECTIONAL	GPIO, ADC
6	IO3	GPIO3	BIDIRECTIONAL	GPIO, ADC
7	IO10	SPI_CS	BIDIRECTIONAL	GPIO, SPI Chip Select
8	IO11	SPI_D	BIDIRECTIONAL	GPIO, SPI Data
9	IO12	SPI_CLK	BIDIRECTIONAL	GPIO, SPI Clock
10	IO13	SPI_Q	BIDIRECTIONAL	GPIO, SPI Q
11	IO16	I2C_SCL	BIDIRECTIONAL	GPIO, I2C Clock
12	IO17	I2C_SDA	BIDIRECTIONAL	GPIO, I2C Data
13	IO18	UART_TX	BIDIRECTIONAL	GPIO, UART TX
14	IO19	UART_RX	BIDIRECTIONAL	GPIO, UART RX

Legend

Function Pin role

GPIO ESP32 pin

I/O Direction

# Pin number

Default Tools & Configuration

Build and upload settings for LilyGo T3S3 V1.0

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	opi
Maximum upload size	3072 KB (3145728 bytes)
Maximum data size	320 KB (327680 bytes)