homemaster-dev

🚧 Project Status: Under Active Development & Testing

Important Notice: This documentation, hardware designs, and firmware are for the pre-release version of the HomeMaster system. All information is preliminary and may contain errors or be subject to change.

• Hardware: Modules are currently in the prototyping and testing phase. Final production versions may differ.
• Firmware: Firmware is under active development and is considered beta. Features, configurations, and stability are being refined.

Please use this information for evaluation and development purposes only. Check the Releases page for the latest stable versions and updates.

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AIO-422-R1 – Analog I/O & RTD Interface Module

The AIO-422-R1 is a high-precision analog I/O expansion module designed for home automation, HVAC, environmental monitoring, applications. It connects to MicroPLC or MiniPLC controllers via RS-485 (Modbus RTU) and seamlessly integrates with ESPHome and Home Assistant for analog sensing and control in smart automation systems.

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🔧 Key Features

• 4× Analog Inputs (0–10 V)
  • High-resolution 16-bit ADC (ADS1115)
  • Ideal for sensors, potentiometers, control signals
• 2× Analog Outputs (0–10 V)
  • 12-bit DAC (MCP4725) with stable output
  • For actuators, dimmers, speed control
• 2× RTD Inputs (PT100/PT1000)
  • Based on MAX31865
  • Supports 2-, 3-, or 4-wire sensors
  • Accurate temperature readings with fault detection
• User Interface
  • 4 front-panel buttons + status LEDs
  • USB Type-C for firmware updates & diagnostics
• Modbus RTU over RS‑485
  • Predefined register map
  • Fully compatible with MicroPLC, and MiniPLC

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🧠 Smart Home & Automation Integration

The AIO-422-R1 works out of the box with MicroPLC or MiniPLC systems and can be fully integrated into Home Assistant via ESPHome for:

• Real-time analog signal monitoring
• Analog output automation (lighting, HVAC, pumps)
• Accurate temperature-based triggers using RTDs
• Custom automation logic via MQTT or native ESPHome entities

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📦 Firmware & Programming

• Comes preloaded with MicroPython firmware
• Programmable via:
  • MicroPython
  • C/C++
  • Arduino IDE
• Flexible customization for edge logic, timers, PID loops, etc.

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⚙️ Technical Specifications

Parameter	Value
Power Supply	24 V DC
Analog Inputs	4 × 0–10 V (ADS1115, 16-bit)
Analog Outputs	2 × 0–10 V (MCP4725, 12-bit)
RTD Inputs	2 × PT100/PT1000 (MAX31865)
RTD Wiring Support	2-, 3-, 4-wire
Input/Output Protection	ESD, overvoltage
Communication Interface	RS‑485 (Modbus RTU)
USB Port	USB Type‑C
Dimensions	DIN-rail, 3 modules wide
Compatibility	MicroPLC, MiniPLC

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🏠 Example Use Cases

• Control 0–10 V dimmable lighting
• Read analog pressure or humidity sensors
• Automate HVAC dampers and valves
• Monitor RTD-based industrial temperature points
• Implement PID control loops locally on MicroPLC

License

Licensing

This project uses a hybrid licensing model.

Hardware

Hardware designs (schematics, PCB layouts, BOMs) are licensed under: CERN-OHL-W v2

Firmware & ESPHome Integration

All firmware, ESPHome configurations, and software components are licensed under: MIT License

This ensures full compatibility with ESPHome and Home Assistant while protecting hardware designs.

See LICENSE files in each directory for full terms.

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🔧 HOMEMASTER – Modular control. Custom logic.