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LilyGo T-Eth Lite
ESP32 board with Ethernet support - great for wired IoT devices, industrial monitoring, and secure networking.
95 × 28 mm
ESP32
MCU
240MHz
clock
16MB
flash
520KB
SRAM
10· 8 ADC
GPIO
BLE 4.2+ WiFi
radio
Pinout
22 pins · 2.54 mm pitch
| Pin | GPIO | Labels | Status | Capabilities | Notes |
|---|---|---|---|---|---|
| 1 | - | 3V33.3V | power | - | P2 header pin 1 - 3.3V output |
| 2 | - | GND | ground | - | P2 header pin 2 - ground |
| 3 | 15 | CSIO15GPIO15 | strapping | adc · touch · pwm | P2 header pin 3 - TFT-shield display SPI chip-select. ADC2_CH3, Touch3, boot strapping pin |
| 4 | 2 | RSTIO2GPIO2 | strapping | adc · touch · pwm | P2 header pin 4 - TFT-shield display reset. ADC2_CH2, Touch2, boot strapping pin |
| 5 | 4 | DCIO4GPIO4 | strapping | adc · touch · pwm | P2 header pin 5 - TFT-shield display data/command select. ADC2_CH0, Touch0 |
| 6 | 33 | LEDIO33GPIO33 | safe | adc · touch · pwm | P2 header pin 8 - TFT-shield backlight control. ADC1_CH5, Touch8 |
| 7 | 32 | T_CSIO32GPIO32 | safe | adc · touch · pwm | P2 header pin 11 - TFT-shield touch chip-select. ADC1_CH4, Touch9 |
| 8 | 39 | T_IRQIO39GPIO39 | strapping | adc | P2 header pin 14 - TFT-shield touch interrupt. Input-only, ADC1_CH3 |
| 9 | - | 3V33.3V | power | - | P2 header pin 15 - 3.3V output |
| 10 | - | GND | ground | - | P3 header pin 1 - ground |
| 11 | - | 5V | power | - | P3 header pin 2 - 5V rail (VCC5V) |
| 12 | - | GND | ground | - | P3 header pin 3 - ground |
| 13 | - | 5V | power | - | P3 header pin 4 - 5V rail (VCC5V) |
| 14 | - | 5V | power | - | P3 header pin 5 - 5V input (VBUS) |
| 15 | - | GND | ground | - | P3 header pin 6 - ground |
| 16 | 38 | IO38GPIO38 | strapping | adc | P3 header pin 7 - free GPIO. Input-only, ADC1_CH2 |
| 17 | 35 | IO35GPIO35 | strapping | adc | P3 header pin 8 - free GPIO. Input-only, ADC1_CH7 |
| 18 | - | ENESP_RST | control | - | P3 header pin 11 - chip enable / board reset (RST button) |
| 19 | 3 | RXDIO3GPIO3 | uart | uart · pwm | P3 header pin 12 - UART0 RX (U0RXD, programming/console) |
| 20 | 1 | TXDIO1GPIO1 | uart | uart · pwm | P3 header pin 13 - UART0 TX (U0TXD, programming/console) |
| 21 | - | GND | ground | - | P3 header pin 14 - ground |
| 22 | - | 5V | power | - | P3 header pin 15 - 5V input (VBUS) |
Start with these
2 pins with no boot or system involvementLEDIO33T_CSIO32
Freely assignable - no strapping, flash, USB or JTAG duties. Ideal first picks for buttons, sensors and LEDs.
Fine - with a little care
sampled at boot or shared with debug/serial| Pin | Label | What to know | Role |
|---|---|---|---|
| CS | MTDO (GPIO15) | Keep HIGH during boot (internal PU); if LOW on reset, bootloader log is silenced and boot mode may change. | Strapping |
| RST | GPIO2 | If driven HIGH on reset (while IO0 is LOW), selects an unsupported SDIO boot mode, causing boot failure. | Strapping |
| DC | GPIO4 | Sampled at reset for boot config; should not be driven at boot (affects boot mode timing). | Strapping |
| T_IRQ | GPIO39 (SENSOR_VN) | Cannot be used as output; only suitable for input. | Other |
| IO38 | GPIO38 (SENSOR_CAPN) | Cannot be used as output; only suitable for input. | Other |
| IO35 | GPIO35 | Cannot be used as output; only suitable for input. | Other |
Only if you know the tricks
wired to flash or USB - expect a fight| Pin | Label | What to know | Role |
|---|---|---|---|
| RXD | 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 |
| TXD | 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 |
These are recommendations, not hard rules - with the right pull-ups, timing and boot-state awareness most pins can be made to work. When in doubt, start green.
Pinout notes The LilyGo T-Eth Lite breaks out 22 pins in total: 10 GPIO for your project, with 3V3 , GND and 5V handling power. On the analog side there are 8 ADC-capable…
The LilyGo T-Eth Lite breaks out 22 pins in total: 10 GPIO for your project, with 3V3, GND and 5V handling power.
On the analog side there are 8 ADC-capable pins for sensors and battery monitoring, PWM on 7 pins and 5 capacitive-touch inputs.
If you want zero surprises, LED and T_CS are free of any such role - the safest first picks. 6 of the exposed pins carry boot-time or system duties on the ESP32 (CS, RST, DC and 3 more).
Getting started
flash your first firmware in ~2 minutes1
Connect over USB
Install your USB-serial driver (CH340 / CP210x) if no port appears. Not detected? Hold BOOT while plugging in.
2
Match & flash
Set the Tools options shown, then click Upload.
3
Verify it runs
The onboard LED on GPIO33 blinks - swap the pin if your board's LED differs.
Set these in Tools · leave everything else at default
Arduino IDE 2.x — Tools Copy
Board: "ESP32 Wrover Module"▸
Flash Size: "16MB (128Mb)"▸
Flash Mode: "DIO"▸
PSRAM: "QSPI PSRAM"▸
Partition Scheme: "16M Flash (3MB APP / 9.9MB FATFS)" (default)▸
Upload Speed: "921600"▸
▸ every other Tools option — leave at default
Board: ESP32 Wrover Module Flash Size: 16MB (128Mb) Flash Mode: DIO PSRAM: QSPI PSRAM Partition Scheme: 16M Flash (3MB APP / 9.9MB FATFS) Upload Speed: 921600
Find it: Tools ▸ Board ▸ ESP32 Arduino ▸ ESP32 Wrover Module
// blink the onboard LED
void setup() {
pinMode(33, OUTPUT);
}
void loop() {
digitalWrite(33, HIGH); delay(500);
digitalWrite(33, LOW); delay(500);
}board to selectesp32dev⧉ copy
[env:lilygo_t_eth_lite]
platform = espressif32
board = esp32dev
framework = arduino
monitor_speed = 115200
upload_speed = 921600
board_build.arduino.memory_type = qio_qspi
build_flags = -DBOARD_HAS_PSRAMFind it: PlatformIO Home ▸ Boards, search
esp32dev — or type it after board =.board to selectesp32dev⧉ copy
esp32:
board: esp32dev
variant: lilygo_t_eth_lite
framework:
type: esp-idf
psram:
mode: quad
speed: 80MHz
# blink - GPIO33
output:
- platform: gpio
pin: 33
id: led_out
light:
- platform: binary
name: "LED"
output: led_outFind it: search ESPHome's board list for
esp32dev (same ids as PlatformIO).esptool doesn't pick board settings — a prebuilt .bin already has them baked in. This is just the raw flash command.
esptool.py --chip esp32 --port /dev/ttyACM0 \
--baud 921600 write_flash 0x0 firmware.bin--port = your /dev/tty* (macOS/Linux) or COMx (Windows).Build details: sketch space 1310720 B · data 327680 B · DIO
Specifications
ESP32 · 95 × 28 mmCompute
MCU
ESP32
Clock
240 MHz
SRAM · Flash
520 KB · 16MB · 8MB (QSPI) PSRAM
Radio
Wi-Fi
802.11 b/g/n
Bluetooth
4.2 LE
Antenna
PCB
I/O
GPIO · ADC
10 · 8
UART · I²C · SPI
3 · 2 · 4
PWM
16 channels
Power
USB
None
Serial
-
Boot address
0x1000
Flashing
Upload · OTA
esptool_py · esp_ota
Flash · Boot mode
DIO · QIO
Sketch · Data
1.25 MB · 320 KB
95 × 28 mm · pin pitch 2.54 mm
The LilyGo T-Eth Lite uses esptool_py for firmware uploads, esp_ota for over-the-air (OTA) updates. Flash mode is DIO with QIO boot mode. The maximum sketch size is 1.25 MB with 320 KB available for data.
About this board
At its core is the ESP32 - a dual-core Xtensa with both Bluetooth Classic and BLE.
Expect to pay about $14.88 - less than the ~$20 most ESP32 boards go for.
Only 10 GPIO are broken out, where most ESP32 boards manage about 24 - worth checking the pinout covers what you need.
Onboard you'll find 8MB (QSPI) PSRAM, a microSD slot, wired Ethernet (RTL8201) and Reset/Boot buttons.
The LilyGo T-Eth Lite is an ESP32-based development board designed for Ethernet and IoT applications. Featuring a built-in RTL8201 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.
- RJ45 Ethernet port (RTL8201 PHY)
- Optional PoE via add-on POE/Camera shield
- No onboard USB; needs an external USB-to-serial adapter for flashing
Where to buy
prices are typical street pricesLilyGo T-Eth Lite
$14.88per unit, typical
Resources
Board datasheet lilygo.cc↗ ESP32 datasheet espressif.com↗ LilyGo T-ETH-Lite product page lilygo.cc↗LilyGO-T-ETH-Series GitHub github.com↗TinyTronics - T-ETH-Lite ESP32 (RTL8201, H673) tinytronics.nl↗T-ETH-Lite ESP32 schematic (Xinyuan-LilyGO GitHub) github.com↗T-ETH-Lite ESP32 pin defines - utilities.h (Xinyuan-LilyGO GitHub) github.com↗
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