Relio

Relio : A Matter-Enabled Smart Controller for AC Appliances Version: v1

📖 Project Overview

This project is a Matter-enabled smart controller built around the ESP32, with support for relay control, environment sensing, energy monitoring, and occupancy detection.
It combines hardware (KiCAD PCB design) and firmware (Arduino/C++ code) into a single, ready-to-build system.

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🌟 Sponsor

This project is proudly sponsored by NextPCB 🌐 – a leading PCB manufacturer providing high-quality PCB prototyping, assembly, and manufacturing services.

Special thanks to DFRobot 🤖 for their amazing open-source hardware, sensors, and development boards that help makers and engineers bring ideas to life.

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📂 Repository Structure

├── hardware/      # KiCAD PCB design files (schematics & layout)
└── src/           # Source code (Arduino / ESP-IDF compatible)

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⚙️ Features

• 3x On/Off Lights 💡
  Controlled through a TCA9554 I²C expander.

  • Always start OFF when powered up (safe startup).
  • Exposed as separate Matter endpoints.

• Environmental Sensing (BME688) 🌡️💧

  • Temperature & Humidity exposed to Matter.
  • Pressure & Gas Resistance logged to Serial for debugging.

• Energy Monitoring (BL0942) ⚡

  • Measures Voltage, Current, Power, Energy, Frequency.
  • Data shown in Serial logs (Watts/Current can later be exposed to Matter).

• Occupancy Detection 🚶‍♂️

  • Uses TCA9554 pin 0 as input.
  • HIGH = Occupied, LOW = Not Occupied.
  • Reflected in Matter occupancy endpoint.

• Commissioning & Control 🔐

  • Commission into Matter fabric with QR/Manual code.
  • BOOT button short press = toggle Light 1.
  • BOOT button long press (5s) = decommission node.

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🧑‍💻 How the Code Works

• Relay Control:
  SWITCH1/2/3 booleans track relay states. Callbacks ensure Matter state and hardware (TCA9554 relays) stay in sync.

• BME688:
  Reads real temperature/humidity every 5s → updates Matter.
  Pressure/gas logged for debugging but not exposed to Matter (yet).

• BL0942:
  Runs on Serial1 (pins RX=4, TX=5, 4800 baud). Provides live power metrics to Serial monitor.

• Occupancy:
  Directly read from TCA9554 pin 0. When state changes, it’s pushed to the Matter controller and printed to Serial.

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🚀 Getting Started

1. Clone this repo:

   git clone https://github.com/ElektorLabs/Relio.git

2. Open the src/ folder in Arduino IDE or PlatformIO.

3. Install dependencies:

   • Espressif Matter Arduino
   • TCA9554 library
   • BL0942 library
   • BME688 library

4. Upload the code to your ESP32.

5. Use your Matter controller app to commission the device.

🛠️ Future Work

• Expose BL0942 Power/Current as native Matter attributes.
• Add Matter endpoints for Pressure & Gas Resistance.
• Add configurable boot behavior (restore last state vs always OFF).

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⚠️ Disclaimer

This project is provided as-is, without warranty of any kind. ⚡ Caution: This project involves mains-level voltages (relays, energy metering). Only experienced users should build or test this hardware. Always follow electrical safety best practices when working with AC-powered circuits.

The author is not responsible for any damage, injury, or loss caused by misuse of this code or hardware.