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ESP32-S3 High-Current 4-Channel Relay Controller + W5500 UDP Relay Control Demo and Source Code

Higenis HG-ESP32-S3-RLY4-PRO + W5500: an ESP32-S3 industrial controller that drives real relays over UDP via SPI Ethernet.

TheoIm

Published August 28, 2026

116 UCC

30 WCC

8 VAR

Original author: 천동이 · South KoreaOriginal source (new tab)

ESP32-S3 High-Current 4-Channel Relay Controller + W5500 UDP Relay Control Demo and Source Code

Components

Hardware components
W5500

WIZnet - W5500

x 1

WIZnet parts

Project description

Higenis HG-ESP32-S3-RLY4-PRO + W5500: an ESP32-S3 industrial controller that drives real relays over UDP via SPI Ethernet. Higenis developed the HG-ESP32-S3-RLY4-PRO, an industrial control board based on the ESP32-S3. In a blog post published on 15 August 2026, the author (chandong83) demonstrated remote relay control over Ethernet by connecting a WIZnet W5500 module to that board over SPI. This is more than a standard ESP32 development board. It integrates four high-current relay channels, two RS485 interfaces, CAN, USB-C, OLED connectivity, external GPIO, a WS2812 status LED, Wi-Fi, and…

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