T-ETH LTE Quick Start

Required Libraries

Library	Version	Source
TinyGSM	Latest	GitHub
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-LTE 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>

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

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

void loop() { delay(1000); }

LTE Data (TinyGSM)

#define TINY_GSM_MODEM_SIM7600
#include <TinyGsmClient.h>

// LTE modem UART pins — check utilities.h
HardwareSerial modemSerial(1);
TinyGsm modem(modemSerial);

void setup() {
  Serial.begin(115200);
  modemSerial.begin(115200, SERIAL_8N1, /*RX=*/4, /*TX=*/5);
  // Power on LTE module
  pinMode(12, OUTPUT);
  digitalWrite(12, HIGH); delay(1000);
  digitalWrite(12, LOW);  delay(2000);

  modem.restart();
  Serial.println("Modem: " + modem.getModemInfo());
  modem.gprsConnect("your.apn", "", "");
  Serial.println("LTE connected: " + String(modem.isGprsConnected()));
}

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: LTE modem not responding?
A: Ensure a valid nano SIM is inserted. Check that the LTE antenna is connected. Power cycle the board after SIM insertion.