LILYGO T-Relay S3
ESP32-S3 board with 6 onboard relays, 16MB flash, 8MB PSRAM, WiFi, and BLE for ESPHome smart home automation, controlling lights, appliances, and HVAC systems.
$23.99
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Specifications
Certifications
Components
Xtensa LX7 dual-core at 240MHz with 16MB flash, 8MB PSRAM, WiFi 802.11 b/g/n, and BLE 5.0.
Six electromechanical relays for switching AC/DC loads up to 10A, each independently controlled by a GPIO pin.
Bus Interfaces
GPIO Map
Overview
The LILYGO T-Relay S3 brings the ESP32-S3's processing power to relay-based home automation, featuring 6 independent relay channels on a single board. With 16MB flash and 8MB PSRAM, it runs ESPHome or Tasmota for immediate Home Assistant integration, turning it into a six-zone smart switch controller.
The 6 relays can independently control AC or DC loads such as lighting circuits, appliances, motorized blinds, irrigation valves, or HVAC zones. The ESP32-S3's WiFi enables OTA firmware updates and MQTT communication, while BLE 5.0 allows local control from smartphones without a hub.
An expansion variant (T-Relay Chain) allows chaining multiple boards together for higher channel counts, and a W5500 Ethernet shield is available for wired network connectivity in environments where WiFi reliability is critical. ESPHome configuration is straightforward, making this board accessible to Home Assistant users without embedded programming experience.
Use Cases
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