LilyGo T-Eth Lite

Development Board

Code name: LILYGO_T_ETH_LITE

LilyGo T-Eth Lite is a development board based on the ESP32 microcontroller using XTENSA architecture.

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

About LilyGo T-Eth Lite

🚀 The LilyGo T-Eth Lite is an ESP32-based development board designed for Ethernet and IoT applications. Featuring a built-in LAN8720 Ethernet PHY, it enables wired network connectivity while maintaining ESP32's WiFi and Bluetooth functionalities. ⚡

📡 With WiFi 802.11 b/g/n and Bluetooth 4.2, the board provides dual-mode connectivity, making it ideal for networking and automation applications.

💾 The T-Eth Lite is equipped with 16MB Flash and 520KB SRAM, offering sufficient resources for a wide range of embedded and IoT projects.

Technical Specifications

Complete technical specification details for LilyGo T-Eth Lite

Connectivity

WiFi 802.11 b/g/n (2.4 GHz)

Bluetooth 4.2

BLE 4.2

Ethernet LAN8720

Microcontroller

Model esp32

Clock Speed 240 MHz

Flash Size 16MB

PSRAM None

Architecture xtensa

✨ Features & Pins

Digital IO 21

Analog Input 6

PWM 14

Interrupts 22

Download Full Datasheet

Quick Setup

Copy-paste configs for LilyGo T-Eth Lite - auto‑generated from this board's exact hardware specs.

ESP32 240 MHz 16MB DIO Xtensa

In Arduino IDE 2 select Lilygo T Eth Lite from the esp32 by Espressif package. In PlatformIO use board = esp32dev. ESP32 · 240 MHz · 16MB · DIO.

Tools menu settings

Board (select in Arduino IDE) Lilygo T Eth Lite

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 T Eth Lite" for the LilyGo T-Eth Lite.

platformio.ini


[env:lilygo_t_eth_lite]
platform  = espressif32
board     = esp32dev
framework = arduino

; Exact hardware config for LilyGo T-Eth Lite
board_build.mcu        = esp32
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: esp32dev
  framework:
    type: arduino   # or "esp-idf"

# LilyGo T-Eth Lite - 240 MHz ESP32
# 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 esp32 \
  --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

LilyGo T-Eth Lite Pinout Diagram

Complete pin reference for LilyGo T-Eth Lite

Safe Pins to Use

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

IO18

IO19

IO21

IO22

IO23

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
IO1	U0TXD (GPIO1)	Connected to on-board USB-UART for uploading and logs; drives serial output at boot, so using as GPIO can disrupt programming or console.	🔌 USB
IO2	GPIO2	If driven HIGH on reset (while IO0 is LOW), selects an unsupported SDIO boot mode, causing boot failure.	🛠️ Strapping
IO3	U0RXD (GPIO3)	Used for receiving data from USB-UART (programming); also pulled HIGH at boot for console communication, so using as GPIO can disrupt uploads.	🔌 USB
IO16	GPIO16	Connected to internal PSRAM on PSRAM-enabled modules; not usable as GPIO on those modules.	⚡ Flash
IO17	GPIO17	Connected to internal PSRAM on PSRAM-enabled modules; not usable as GPIO on those modules.	⚡ Flash

Useful Links

Datasheets and resources for LilyGo T-Eth Lite

Board Datasheet

Technical specifications

ESP32 Datasheet

Microcontroller reference

LilyGo T-Eth Lite Custom Pin Mapping

Pin configuration and GPIO mapping for LilyGo T-Eth Lite

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	IO16	SPI_CS	BIDIRECTIONAL	GPIO, SPI Chip Select
8	IO17	SPI_D	BIDIRECTIONAL	GPIO, SPI Data
9	IO18	SPI_CLK	BIDIRECTIONAL	GPIO, SPI Clock
10	IO19	SPI_Q	BIDIRECTIONAL	GPIO, SPI Q
11	IO21	ETH_TX	OUTPUT	GPIO, Ethernet TX
12	IO22	ETH_RX	INPUT	GPIO, Ethernet RX
13	IO23	ETH_MDIO	BIDIRECTIONAL	GPIO, Ethernet MDIO

Legend

Function Pin role

GPIO ESP32 pin

I/O Direction

# Pin number

Default Tools & Configuration

Build and upload settings for LilyGo T-Eth Lite

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)