---
title: "[NEWS] Reliable Ethernet-Based Smart Home Controller with STM32 + W5500"
url: "https://maker.wiznet.io/Alan/projects/news-reliable-ethernet-based-smart-home-controller-with-stm32-w5500/"
markdown_url: "https://maker.wiznet.io/Alan/projects/news-reliable-ethernet-based-smart-home-controller-with-stm32-w5500/md"
type: "UCC: User Created Content"
author: "Commercial_Froyo_247"
author_url: "https://www.reddit.com/r/homeassistant/comments/1k92ghl/built_a_diy_stm32_smart_home_io_controller_what/"
editor: "WIZnet"
editor_url: "https://maker.wiznet.io/"
original_author: "Commercial_Froyo_247"
original_url: "https://www.reddit.com/r/homeassistant/comments/1k92ghl/built_a_diy_stm32_smart_home_io_controller_what/"
published: "2025-05-07"
language: "en"
likes: 1
views: 1296
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# [NEWS] Reliable Ethernet-Based Smart Home Controller with STM32 + W5500

> A DIY STM32 smart home controller with WIZnet W5500 delivers reliable Ethernet-based automation and seamless ESPHome integration for Home Assistant.

Original author: Commercial_Froyo_247 (source: https://www.reddit.com/r/homeassistant/comments/1k92ghl/built_a_diy_stm32_smart_home_io_controller_what/)

## Article

## News: DIY STM32 Smart Home I/O Controller – Boosting Reliability with WIZnet W5500

### Introduction

Home automation enthusiast **kshypachov** has built an impressive custom **STM32-based Smart Home I/O Controller**, gaining attention in the Home Assistant community. This DIY device goes beyond a personal project, showcasing how **ESPHome**, **Home Assistant**, and **wired Ethernet** can come together to deliver a highly **reliable, real-time home automation solution**.

At the heart of this controller lies the **WIZnet W5500 Ethernet chip**, selected for its proven performance in creating **stable, low-latency network connections**—especially important for smart home applications where reliability is non-negotiable.

![](https://maker.wiznet.io/upload/ckeditor5/252512328%5F1746632088%2Epng)

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### Project Overview

**Project name:** f411_io_mod
**Core functions:**

- 8 digital GPIO outputs (ideal for relays, LEDs)

- 4 analog inputs (sensor monitoring)

- UART, CAN, SPI ports for extensibility

- Seamless ESPHome integration

**Hardware specs:**

- STM32F411 MCU (ARM Cortex-M4)

- WIZnet W5500 Ethernet chip (SPI interface)

- External power supply support with protection circuitry

- Designed for DIN rail mounting (professional enclosure-ready)

GitHub: [kshypachov/f411_io_mod](https://github.com/kshypachov/f411_io_mod)

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### Why WIZnet W5500?

Instead of using a traditional ESP32 Wi-Fi-based module, the developer chose a **wired STM32 + W5500 Ethernet solution**, citing the following key reasons:

**Superior reliability** in fixed installations (no Wi-Fi dropouts)

**Low latency**, ideal for real-time automation triggers

**Full compatibility with ESPHome**, even over Ethernet

> "**Wi-Fi is a great solution, but it’s not always 100% reliable. With Ethernet, my automation setup is much more stable and consistent.**"
> – **kshypachov, via Reddit**

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### Technical Highlights

**ESPHome over UART-to-Ethernet bridge**
ESPHome communicates with the STM32 via Ethernet, with the MCU handling actual I/O control.

**DIN-rail form factor**
The PCB and enclosure are designed for professional deployment in home distribution panels.

**Clear W5500 implementation examples**
SPI setup, MAC/IP assignment, and YAML snippets are provided in the repo for easy replication.

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### Conclusion & Outlook

This project showcases how **WIZnet’s W5500** continues to be a top-tier choice even in modern DIY and maker projects, especially where **network stability and real-time performance** are critical.

As the Home Assistant and ESPHome ecosystems grow, designs like this open new possibilities for **professional-grade DIY smart home systems**. With further development, this approach could integrate well with other WIZnet modules, such as the **W6100** or **WizFi360**, for hybrid network support.

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### References

[Reddit Discussion – Project insights & community feedback](https://www.reddit.com/r/homeassistant/comments/1k92ghl/built_a_diy_stm32_smart_home_io_controller_what/)

[GitHub Repo – f411_io_mod](https://github.com/kshypachov/f411_io_mod)

---

Source: https://maker.wiznet.io/Alan/projects/news-reliable-ethernet-based-smart-home-controller-with-stm32-w5500/