T-Relay-S3 get it now
Overview
LILYGO T-Relay-S3 is an upgraded relay control board powered by the ESP32-S3-WROOM-1U (dual-core LX7, 16 MB Flash, 8 MB PSRAM), featuring 6 relay channels controlled via an SN74HC595 shift register. The board supports up to 3 expansion boards for a total of 24 relays, with each relay rated for up to 10 A. Compatible with Tasmota, ESPHome, and ESPEasy for home automation. Includes expansion headers for optional LCD connection.
Quick Start
Example Support
| Example | PlatformIO/Arduino | ESP-IDF | Description |
|---|---|---|---|
| LilyGo-T-Relay | ✓ | Relay control, ESPHome, Tasmota |
Arduino
- Install Arduino IDE and Arduino ESP32
- In Tools → Board, configure:
| Arduino IDE Setting | Value |
|---|---|
| Board | ESP32S3 Dev Module |
| USB CDC On Boot | Enable |
| Flash Size | 16MB (128Mb) |
| Partition Scheme | 16M Flash (3MB APP/9.9MB FATFS) |
| PSRAM | OPI PSRAM |
| Upload Speed | 921600 |
| USB Mode | CDC and JTAG |
Key Features
- ESP32-S3-WROOM-1U, dual-core LX7 @ 240 MHz, Wi-Fi + Bluetooth 5.0
- 6 relay channels (SN74HC595 shift register controlled)
- Expandable to 24 relays with 3 expansion boards
- Each relay rated up to 10 A load current (max 2500 W)
- 16 MB Flash, 8 MB PSRAM
- 2 × 10-pin expansion seats for optional LCD
- Reset and Boot buttons
- Compatible with Tasmota, ESPHome, ESPEasy
Specifications
| Parameter | Value |
|---|---|
| SOC | ESP32-S3-WROOM-1U, Dual-core LX7 @ 240 MHz |
| Flash | 16 MB |
| PSRAM | 8 MB |
| Wireless | Wi-Fi 802.11 b/g/n, Bluetooth 5.0 |
| Relay Channels | 6 (expandable to 24) |
| Max Load Current | 10 A per relay |
| USB | 1 × USB-C |
Pin Diagram
Schematic
Software Libraries
FAQ
Q. How to expand beyond 6 relays? A. Connect up to 3 expansion boards to the T-Relay-S3, giving a maximum of 24 relay channels.
Q. What is the maximum load? A. Each relay supports up to 10 A. Do not connect loads exceeding 2500 W.
Changelog
| Version | Date | Notes |
|---|---|---|
| V1.0 | Initial release |