Qt5 Modbus Application That Controls a VFD

This project involves the development of a Qt5 application built from the ground up to control a Variable Frequency Drive (VFD) using the Modbus protocol. The application is designed to interface with VFDs, enabling users to send control commands and receive feedback through a simple and intuitive GUI. The project was cross-compiled to run both on Linux and Raspberry Pi platforms, making it versatile and adaptable for embedded systems.

Key Features:

Modbus RTU Communication:

The application communicates with the VFD over the Modbus RTU protocol using RS485. It supports basic Modbus functionalities like reading and writing registers, which are used to control the VFD’s operations such as starting, stopping, setting speed, and monitoring parameters like frequency and current.

VFD Control:

The Qt5 application allows users to:

Start and stop the VFD.

Set various operational parameters such as speed, direction, and acceleration.

Read real-time feedback from the VFD, including current operating status, fault conditions, and sensor data.

Cross-Compiled for Linux and Raspberry Pi:

The project was cross-compiled for Linux and Raspberry Pi, allowing it to be used on both standard desktop systems and embedded environments. The application can run on a Raspberry Pi connected to the VFD via an RS485 interface, making it ideal for industrial automation setups.

User-Friendly Interface:

The GUI is built using Qt5, providing a clean, user-friendly interface that simplifies interaction with the VFD. Users can easily enter parameter values, view real-time data, and control the VFD without needing to deal with low-level Modbus communication directly.

Modular Codebase:

The application is modular, making it easy to adapt or expand for different Modbus devices or additional functionality. It can be modified to communicate with other Modbus-based equipment besides VFDs.

Real-Time Monitoring:

Real-time data monitoring allows users to visualize the VFD’s status, making it suitable for maintenance and diagnostics. The application continuously updates the GUI with current operating parameters like speed, torque, and power usage.

Use Cases:

Industrial Automation:

Control VFDs in industrial environments using Raspberry Pi or Linux systems.

Embedded Systems:

Deploy the application on embedded systems like Raspberry Pi for real-time control of VFDs in machinery or conveyor systems.

Maintenance & Diagnostics:

The GUI provides real-time monitoring of VFD status, which can be used for diagnostics and preventive maintenance.

Cross-Compilation Process:

The project was cross-compiled using Qt's build tools and appropriate toolchains for Raspberry Pi, ensuring it runs smoothly on ARM-based platforms. The cross-compilation setup makes the project easy to deploy in embedded systems and IoT environments.