DC Motor PID Control (Qt GUI)

A real-time DC motor speed control system using PID algorithm on STM32F4, monitored via a Qt C++ PC application.

Key Features

• PID Control: Real-time speed stabilization with adjustable Kp, Ki, Kd parameters.
• Visual Monitoring: Live speed plotting, dashboard, and status indicators.
• Fail-Safe Mechanism:
  • Independent Tx/Rx connection check.
  • Auto-Stop: Microcontroller automatically stops the motor if the connection is lost for more than 3 seconds.

Communication Protocol

The system uses UART (ASCII Strings) for data exchange.

1. PC ➔ STM32 (Commands)

Command	Description	Example Data
C_ALV	Keep-alive signal (sent periodically)	C_ALV
M_STR	Start motor with parameters	M_STR [Kp] [Ki] [Kd] [SP]
M_STP	Stop motor immediately	M_STP
M_INV	Reverse motor direction	M_INV
M_FRE	Set PWM Frequency (Hz)	M_FRE 1000

2. STM32 ➔ PC (Feedback)

Command	Description	Example Data
S_ACK	Connection Acknowledge (Rx OK)	S_ACK
E_LST	Error: Connection Lost (Tx Broken)	E_LST
M_PLT	Real-time speed for plotting	M_PLT 120.5

How to Use

1. Flash firmware to STM32 using Keil C.
2. Connect hardware wiring and plug in USB-TTL.
3. Run the GUI Application on PC.
4. Select the correct COM port and click CONNECT.
5. Enter PID parameters (Kp, Ki, Kd) & Setpoint, then click START.