Wiznet makers

IoT Controller Project (Based on Wiznet W5500, Updated with Role Inclusions)

Project Overview

• Objective: To enable input/output control and network communication using an IoT controller.
• Technical Base: Utilizing BluePill (STM32F103C8) and Mbed OS.

Key Components and Functions

Input/Output Management

• Digital Input/Output: Managing 9 digital inputs and 11 digital outputs.
• LED Output: Using PC_13 to indicate network status.

Sensors and Interfaces

• DS18B20 Temperature Sensor: Measuring and transmitting temperature data.
• I2C Communication: Communicating with OLED display and other I2C-based devices.

Network and MQTT Protocol

• W5500 Ethernet Interface: Providing stable network connectivity.
• MQTT Client: Using MQTT protocol for data publishing and subscription.
• Client and Server Roles
  • Client Role:
    • Reacts to external MQTT commands to control outputs and process sensor data.
    • Connects to the MQTT broker to receive and execute messages.
  • Server-like Functions:
    • Periodically publishes sensor data and controller status information to the MQTT broker.
    • Supports monitoring and control functions of other systems.

System Configuration and Program Logic

• MQTT Broker Setup: Connecting to an MQTT broker via specified IP and port.
• Message Handling: Using MQTT to transmit controller status, inputs/outputs, and sensor data.
• Timer-based Tasks: Periodically updating status and transmitting data.
• OLED Display Management: Displaying system status and information.

Conclusion and Application Areas

• This project offers network-based remote monitoring and control capabilities in IoT environments.
• It allows for the integration of various inputs/outputs and sensors, managing data through network connections.
• Efficient data communication using the MQTT protocol extends the scope of IoT applications.