T-Relay get it now

Overview

LILYGO T-Relay is an ESP32-based development board with integrated relay outputs. Powered by the ESP32-WROVER-E module (dual-core Xtensa LX6, 240 MHz), it combines Wi-Fi 4 (802.11 b/g/n) and Bluetooth 4.2 with 4 optocoupler-isolated relay channels capable of switching up to 250 V AC / 10 A or 28 V DC / 10 A. The board accepts a wide 5–24 V DC power input, exposes spare GPIOs on a header, and is compatible with Tasmota, ESPHome, and other ESP32 firmware frameworks. Ideal for smart home automation, remote switching, and industrial control applications.

Quick Start

Example Support

Example	PlatformIO/Arduino	ESP-IDF	Description
LilyGo-T-Relay	✓		Relay control, ESPHome, Tasmota examples

PlatformIO

1. Install Visual Studio Code and Python
2. Search for and install the PlatformIO IDE extension in VS Code
3. Open the LilyGo-T-Relay project folder
4. Open platformio.ini and select your example
5. Click ✓ to compile, connect via USB-C, click → to upload

Note: The board cannot be flashed via USB without the LilyGO T-U2T USB-to-serial adapter. Use the T-U2T or another CP210x/CH340 adapter connected to the UART header.

Arduino

1. Install Arduino IDE
2. Install Arduino ESP32
3. In Tools → Board, select ESP32 Wrover Module
4. Set Partition Scheme to Huge APP (3MB No OTA/1MB SPIFFS)
5. Set PSRAM to Enabled
6. Click Upload

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Key Features

• ESP32-WROVER-E dual-core Xtensa LX6 @ 240 MHz, Wi-Fi + Bluetooth 4.2
• 4 optocoupler-isolated relay channels (HRS4H-S-DC5V)
• Relay contacts: 250 V AC / 10 A or 28 V DC / 10 A
• Wide input voltage: 5–24 V DC
• 4 MB Flash, 8 MB PSRAM
• Blue LED status indicator per relay channel
• All spare GPIOs broken out on a pin header
• Compatible with Tasmota, ESPHome, ESPEasy

Specifications

Parameter	Value
SOC	ESP32-WROVER-E (Xtensa dual-core LX6, 240 MHz)
Flash	4 MB
PSRAM	8 MB
Wireless	Wi-Fi 802.11 b/g/n, Bluetooth 4.2
Relay Channels	4
Relay Rating	250 V AC / 10 A, 28 V DC / 10 A
Input Voltage	5–24 V DC
Logic Voltage	3.3 V
USB	USB-C (power only; serial via T-U2T adapter)
Dimensions
Weight

Pin Diagram

Relay	GPIO
K1	GPIO21
K2	GPIO19
K3	GPIO18
K4	GPIO5

Dimensions

Schematic

• LilyGo-T-Relay GitHub Repository (hardware)

Datasheet

Software Libraries

• LilyGo-T-Relay GitHub Repository

Tasmota

• T-Relay Tasmota Template

FAQ

Changelog

Version	Date	Notes
V1.0		Initial release