T-ETH Lite S3 Quick Start

Required Libraries

Library	Version	Source
ETHClass2	Latest	GitHub

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Arduino

PlatformIO (Recommended)

1. Install VS Code and the PlatformIO IDE extension
2. Clone the repository:

   git clone https://github.com/Xinyuan-LilyGO/LilyGO-T-ETH-Series.git

3. Open platformio.ini and uncomment the T-ETH-Lite-S3 environment
4. Click ✓ to build, connect via USB-C, click → to upload

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Arduino IDE

Board Settings

Setting	Value
Board	ESP32S3 Dev Module
Upload Speed	921600
USB CDC On Boot	Enable
CPU Frequency	240 MHz (WiFi)
Flash Size	16 MB (128Mb)
Partition Scheme	16M Flash (3MB APP/9.9MB FATFS)
PSRAM	OPI PSRAM

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Peripheral Examples

Ethernet (ETHClass2)

#include <ETHClass2.h>

// T-ETH Lite S3 uses W5500 SPI Ethernet
// Pin definitions from LilyGO-T-ETH-Series/src/utilities.h
#define ETH_PHY_TYPE  ETH_PHY_W5500
#define ETH_PHY_CS    9
#define ETH_PHY_IRQ   21
#define ETH_PHY_RST   14
#define ETH_PHY_SCK   12
#define ETH_PHY_MISO  13
#define ETH_PHY_MOSI  11

ETHClass2 ETH2(ETH_PHY_TYPE, 1, ETH_PHY_CS, ETH_PHY_IRQ,
               ETH_PHY_RST, SPI, ETH_PHY_SCK, ETH_PHY_MISO, ETH_PHY_MOSI);

void onEthEvent(arduino_event_id_t event) {
  if (event == ARDUINO_EVENT_ETH_GOT_IP) {
    Serial.print("Ethernet IP: ");
    Serial.println(ETH2.localIP());
  }
}

void setup() {
  Serial.begin(115200);
  WiFi.onEvent(onEthEvent);
  ETH2.begin();
}

void loop() { delay(1000); }

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FAQ

Q: Upload keeps failing?
A: Hold BOOT, press and release RST, then release BOOT to enter download mode.

Q: What is the difference from T-ETH Lite?
A: T-ETH Lite S3 uses ESP32-S3 instead of ESP32, providing faster dual-core LX7 processing, more GPIO, and USB OTG support.