Summary of Sensored BLDC Motor Control using dsPIC33FJ12MC202 with Proteus Simulation
This project demonstrates sensored BLDC motor control using a dsPIC33FJ12MC202 in a Proteus simulation, combining Hall sensors, MCPWM, ADC-triggered sampling, and timers for commutation and speed control. A potentiometer provides duty-cycle speed input; Input Capture and Timer 3 measure rotor speed. The firmware follows Microchip AN957 and initializes ADC, MCPWM, Input Capture, and timers for synchronized, deterministic motor control and is suitable for learning and firmware validation before hardware tests.
Parts used in the Sensored BLDC Motor Control using dsPIC33FJ12MC202 with Proteus Simulation:
- dsPIC33FJ12MC202 microcontroller
- BLDC motor (star connected)
- Hall effect sensors (A, B, C)
- Potentiometer (speed input)
- Resistors (pull-ups, current limiting)
- LEDs (status indication)
- MCPWM hardware module (on dsPIC)
- Timers (TMR1, TMR3)
- Proteus VSM simulation environment
Introduction
This microcontroller project demonstrates sensored BLDC motor control using a dsPIC33FJ12MC202 and a complete Proteus simulation environment.
Based on Microchip Application Note AN957, the project shows how Hall sensors, PWM generation, ADC input, and timers work together for reliable motor commutation and speed control.
It is a practical embedded systems example for anyone learning motor control, dsPIC PWM modules, and real-time firmware design.
The project is ideal for students and engineers exploring DIY electronics, BLDC fundamentals, and motor control firmware in simulation before hardware testing.
How the Project Works (Overview)
The system controls a sensored BLDC motor using three Hall-effect signals to determine rotor position.
The dsPIC33 reads Hall transitions through Input Capture modules, calculates timing using Timer 3, and updates commutation through the Motor Control PWM (MCPWM) module.
A potentiometer connected to the ADC provides duty-cycle control, allowing real-time speed variation.
PWM triggers ADC sampling, ensuring synchronized control between motor drive and feedback.
Block Diagram / Workflow Explanation
Potentiometer (AN0) provides speed reference
ADC module samples speed command
MCPWM module generates three independent PWM signals
Hall sensors (A, B, C) feed rotor position into Input Capture modules
Timer 3 measures rotor speed using Hall transitions
OVDCON logic updates PWM outputs for proper commutation
BLDC motor responds with controlled speed and direction
Key Features (Auto-Generated)
Sensored BLDC motor commutation using Hall feedback
Independent PWM generation via dsPIC MCPWM module
ADC-based speed control using a potentiometer
PWM-triggered ADC sampling for synchronized control
Rotor speed measurement using Input Capture + Timer 3
Designed for Proteus simulation and firmware testing
Based on Microchip Application Note AN957
Components Used
dsPIC33FJ12MC202 microcontroller
BLDC motor (star connected)
Hall effect sensors (A, B, C)
Potentiometer (speed input)
Resistors (pull-ups, current limiting)
LEDs (status indication)
MCPWM hardware module
Timers (TMR1, TMR3)
Applications
BLDC motor speed control systems
Robotics and motion control platforms
Educational motor control labs
Industrial motor drive prototypes
Embedded systems learning projects
Simulation-based firmware validation
Explanation of the Code (High-Level)
The firmware initializes and coordinates multiple dsPIC peripherals:
ADC Initialization (
InitADC10)
Configures single-channel ADC input for the potentiometer. ADC conversion is triggered by PWM for synchronized sampling.PWM Initialization (
InitMCPWM)
Sets PWM frequency (~39 kHz), enables independent PWM outputs, and prepares duty-cycle registers for real-time updates.Hall Sensor Input Capture (
InitIC)
Configures Input Capture modules to detect Hall sensor transitions. One channel is used for speed calculation, others for commutation.Timer 3 (
InitTMR3)
Measures rotor speed by timing Hall transitions using a prescaled system clock.Timer 1 (
InitTMR1)
Provides a fixed periodic interrupt (1 kHz) for background control tasks.
This modular structure keeps motor control logic deterministic and efficient.
Source Code
File: Init.c
//
// Written By: Bill Anderson, Microchip Technology
//
//
// The following files should be included in the MPLAB project:
//
// SensoredBLDC.c -- Main source code file
// Interrupts.c
// Init.c
// SensoredBLDC.h -- Header file
// p33FJ256MC710.gld -- Linker script file
// Proteus Simulation
In Proteus VSM, the dsPIC33 drives a simulated BLDC motor using Hall feedback.
Changing the potentiometer value alters ADC readings, which directly adjust PWM duty cycle.
Hall sensor transitions are visible through Input Capture events, confirming correct commutation timing and speed response.
(FAQs)
Conclusion
This project is an excellent embedded systems learning example for sensored BLDC motor control using a dsPIC33 microcontroller.
With structured firmware, real-time peripherals, and Proteus simulation, it provides strong practical insight into motor control firmware design.
Ideal for students, hobbyists, and engineers building confidence in microcontroller projects and motor control systems.
- Why use Hall sensors in BLDC control?
They provide accurate rotor position for reliable commutation. - Can this project run without hardware?
Yes, it is fully designed for Proteus simulation. - Which PWM mode is used?
Independent PWM mode with output override control. - How is motor speed measured?
Using Hall sensor transitions timed by Timer 3. - Can the PWM frequency be changed?
Yes, by modifying FPWM and PTPER. - Is this compatible with other dsPIC33 devices?
Conceptually yes, but register mapping may differ. - Why trigger ADC from PWM?
It ensures synchronized sampling with motor switching. - Can this be extended to closed-loop speed control?
Yes, by adding a PID controller in firmware.
