MultiSensor: ESP32-S3 + W5500 PoE Smart Home Multi-Sensor Board

ESP32-S3 + W5500 PoE multi-sensor board for smart homes — monitors temperature, humidity, CO₂, light, motion with reliable wired networking.

COMPONENTS

PROJECT DESCRIPTION

Author

- Multi Sensor : Completed(W5500)

- DOMORIC-MADE-EASY : Ongoing(W5500)

A wired + wireless, open-source sensor platform for reliable environmental and presence monitoring

🧩 COMPONENTS

Type	Component	Description
MCU	ESP32-S3	USB-C, dual-core MCU with PSRAM
Ethernet	W5500 Module + PoE	SPI-based 10/100 Mbps Ethernet + Power over Ethernet support
Sensors	BME280, BH1750, SCD41, HLK-LD2410C mmWave	Measures temperature, humidity, pressure, CO₂, light, and presence
I/O	IR LED, UART, I²C, GPIO Headers	Supports remote control and sensor expansion
Power	PoE / USB-C	3.3 V & 5 V rails with LDO noise filtering
Software	ESPHome / MQTT / Arduino Firmware	Wi-Fi and Ethernet coexistence, MQTT publishing, OTA update
Hardware Docs	Schematics & PCB ( EasyEDA )	Fully open-source for DIY and education use

🎯 PROJECT DESCRIPTION

1️⃣ Overview

MultiSensor is an open-source smart-home and IoT sensor board designed by @carletz.
It combines the ESP32-S3 microcontroller with the WIZnet W5500 Ethernet controller and PoE (Power over Ethernet) support, creating a reliable wired + wireless sensor node.

The board integrates multiple environmental and motion sensors, making it suitable for home automation, indoor air-quality monitoring, and industrial sensing where Wi-Fi may not be reliable.

2️⃣ Hardware Design Highlights

Network Interface:
W5500 provides a stable Ethernet connection via SPI; PoE module supplies power through the same cable.

Sensor Integration:
I²C bus connects BME280 (temp/humidity/pressure), BH1750 (lux), and SCD41 (CO₂), plus UART for mmWave presence sensor (HLK-LD2410C).

Power Design:
Supports PoE and USB-C; LDO regulators and power-plane separation reduce noise affecting analog measurements.

Firmware Compatibility:
ESPHome config files and Arduino sketches included in the GitHub repo enable MQTT integration, Home Assistant automation, and OTA updates.

Expansion Headers:
GPIO breakouts for relays, IR LEDs, or additional sensors allow custom IoT development.

3️⃣ GitHub Project Details

Repository: https://github.com/carletz/MultiSensor

Contents include:

✅ Hardware Design Files (schematics, PCB layout, BOM – EasyEDA)

✅ Firmware Sources for ESPHome and Arduino

✅ PoE and W5500 interface examples using SPI communication

✅ Home Assistant MQTT integration example configs

✅ Build instructions and pinout documentation

Firmware Functions:

Reads environmental and presence data

Publishes to MQTT broker or Home Assistant

Supports both Ethernet (W5500) and Wi-Fi connectivity

Includes OTA firmware update support

🧰 Getting Started

Flash Sensor.yaml using ESPHome Dashboard or CLI.
Connect the board to a PoE-enabled Ethernet switch or inject 5V via USB-C.
Open the web interface at the IP assigned via DHCP.
Integrate with Home Assistant or any MQTT broker at 192.168.1.XX

4️⃣ Use Cases

Scenario	Description
Smart Home Automation	Real-time CO₂, temperature and presence data control lights or HVAC
Energy Optimization	Detect room occupancy and reduce power consumption via PoE nodes
Industrial IoT	Reliable Ethernet communication for data logging and monitoring
DIY and Education	Open-source hardware ideal for learning sensor networks and firmware design

📡 NETWORK BLOCK DIAGRAM

     				   [MQTT Broker / Home Assistant]
           								        │
          						      (Ethernet)
          							         │
       						      [W5500 + PoE]
              						    	 │ (SPI)
            					 [ESP32-S3 MCU]
                						   │ (I²C / UART)
   ┌───────┬─────────┬─────────┐
 [BME280]   [BH1750]   [SCD41 CO₂]   [LD2410C mmWave]
                          │
              [IR LED / Relay / GPIO]

📘 REFERENCE LINKS

🔗 MultiSensor on GitHub

🔗 Domotic Easy on OSHWLab – companion DIY controller board

🔗 WIZnet W5500 Product Page

💬 COMMENTS & TIPS

Combining ESP32-S3 with W5500 ensures low-latency, noise-free data streaming for sensor networks.

For accurate CO₂ and humidity data, separate power and ground planes are recommended on custom PCB variants.

PoE design simplifies installation for large-scale deployments – single cable for power and data.

The project is MIT-licensed, encouraging community forks and custom implementations.

📊 OSHWLab Stars

Item	Description
Page Purpose	Introduction to OSHWLab’s official open-source hardware support and promotion program.
Main Content	Projects that receive enough “Stars” can be selected to receive rewards such as JLCPCB and LCSC coupons, PCB fabrication support, and promotional banner placement.
Participation Method	Open-source projects (e.g., EasyEDA designs with shared schematics and BOM) that meet certain criteria or gain sufficient Stars become eligible for review and selection.
Reward Examples	PCB manufacturing credits, LCSC component discounts, and featuring in the OSHWLab “Featured Projects” section.
Program Goal	To discover outstanding open-source hardware projects and encourage the growth of the global maker community.

🏷️ TAGS

ESP32-S3 W5500 PoE Ethernet MQTT Sensor SmartHome OpenSourceHardware

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