How to Build a Reliable MQTT I/O Controller with W5500 and Arduino Nano for Home Assistant
An Arduino Nano and W5500 create an MQTT-based 8-channel opto-isolated I/O controller with over 280 days of reported uptime.
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Components
Hardware components
WIZnet - W5500
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Arduino - Arduino Nano R3
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Project description
Step 1: Understanding the Hardware This project demonstrates a practical Ethernet-based home automation controller built around an Arduino Nano and the WIZnet W5500 Ethernet controller. The board provides: Arduino Nano MCU W5500 Ethernet module 8 opto-isolated digital inputs 8 digital outputs MQTT communication Home Assistant integration Serial debugging interface Expansion capability for RFID readers and other peripherals The W5500 provides: Hardwired TCP/IP stack Integrated MAC + PHY SPI interface 8 hardware sockets 32KB internal TX/RX buffer 10/100 Ethernet connectivity Unlike Wi-Fi-based…
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