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Arduino Nano W5500 Ethernet MQTT Based 8 Channel Opto-Isolated I/O Board

Home assistant

WIZnet

Published February 22, 2023

Original author: Aaron CakeOriginal source (new tab)

Arduino Nano W5500 Ethernet MQTT Based 8 Channel Opto-Isolated I/O Board

Components

Hardware components
Arduino Nano R3

Arduino - Arduino Nano R3

x 1

W5500 Ethernet Shield

WIZnet - W5500 Ethernet Shield

x 1

Project description

Figured I’d shared these boards I designed which form the basis of the I/O side of my Home Assistant installation. I wanted a board which provided simple I/O to control switches and relays using MQTT and connected via Ethernet. There just wasn’t anything out there that fit all my requirements (the big one being the ability to run my own firmware) so I designed these. The board uses an Arduino Nano as the controller. A socket is provided to plug in one of the small W5500 modules commonly available on eBay/Aliexpress. The socket just breaks out the SPI bus with additional power and ground. At…

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