How to Use BLDC Driver 24W, 5-40V, 2A: Examples, Pinouts, and Specs

The BLDC Driver 24W by GREATZT (Part ID: BLDC Driver 24W) is a compact and efficient motor driver designed for controlling Brushless DC (BLDC) motors. It operates at a power rating of 24 watts, supports input voltages ranging from 5V to 40V, and can handle a maximum current of 2A. This driver is ideal for applications requiring precise motor control, such as robotics, drones, electric vehicles, and industrial automation systems.

• Robotics and automation systems
• Electric scooters and drones
• Industrial machinery
• HVAC systems
• DIY motor control projects

The BLDC Driver 24W module features a simple pinout for easy integration into circuits. Below is the pin configuration:

1. Power Supply Connection:

   • Connect the VIN pin to a DC power supply (5V to 40V) capable of providing sufficient current for your motor.
   • Connect the GND pin to the ground of the power supply.

2. Motor Connection:

   • Connect the U, V, and W pins to the corresponding three-phase wires of your BLDC motor. Ensure the connections are secure to avoid interruptions.

3. Control Signals:

   • Use the EN pin to enable or disable the driver. Pull it HIGH to enable the driver.
   • Provide a PWM signal to the PWM pin to control the motor speed. The duty cycle of the PWM signal determines the speed.
   • Use the DIR pin to set the motor's rotation direction. Pull it HIGH for forward rotation and LOW for reverse rotation.

4. Feedback Monitoring:

   • The FG pin outputs a feedback signal proportional to the motor's speed. This can be used for closed-loop control or monitoring.

• Ensure the power supply voltage matches the motor's operating voltage range.
• Do not exceed the maximum current rating of 2A to avoid damaging the driver.
• Use appropriate heat dissipation methods (e.g., heatsinks) if operating at high currents for extended periods.
• Verify the motor's wiring and ensure it matches the U, V, and W outputs of the driver.
• Use a microcontroller (e.g., Arduino) to generate precise PWM and DIR signals for better control.

Below is an example Arduino sketch to control the BLDC motor using the BLDC Driver 24W:

// Define pin connections
const int enablePin = 7;  // Connect to EN pin of the driver
const int pwmPin = 6;     // Connect to PWM pin of the driver
const int dirPin = 5;     // Connect to DIR pin of the driver

void setup() {
  // Set pin modes
  pinMode(enablePin, OUTPUT);
  pinMode(pwmPin, OUTPUT);
  pinMode(dirPin, OUTPUT);

  // Enable the driver
  digitalWrite(enablePin, HIGH);

  // Set initial direction to forward
  digitalWrite(dirPin, HIGH);
}

void loop() {
  // Gradually increase motor speed
  for (int speed = 0; speed <= 255; speed++) {
    analogWrite(pwmPin, speed); // Set PWM duty cycle (0-255)
    delay(20);                  // Small delay for smooth acceleration
  }

  delay(2000); // Run at full speed for 2 seconds

  // Gradually decrease motor speed
  for (int speed = 255; speed >= 0; speed--) {
    analogWrite(pwmPin, speed);
    delay(20);
  }

  delay(2000); // Pause before reversing direction

  // Reverse direction
  digitalWrite(dirPin, LOW);

  // Repeat the same speed control process in reverse direction
  for (int speed = 0; speed <= 255; speed++) {
    analogWrite(pwmPin, speed);
    delay(20);
  }

  delay(2000);

  for (int speed = 255; speed >= 0; speed--) {
    analogWrite(pwmPin, speed);
    delay(20);
  }

  delay(2000); // Pause before switching direction again
}

1. Motor Does Not Spin:

   • Ensure the power supply is connected and providing the correct voltage.
   • Verify that the EN pin is pulled HIGH to enable the driver.
   • Check the motor connections (U, V, W) and ensure they are secure.

2. Motor Spins in the Wrong Direction:

   • Check the DIR pin signal. Pull it HIGH for forward rotation and LOW for reverse.

3. Motor Speed is Unstable:

   • Ensure the PWM signal is stable and within the correct frequency range (typically 1kHz to 20kHz).
   • Verify that the power supply can provide sufficient current for the motor.

4. Driver Overheats:

   • Ensure the current drawn by the motor does not exceed 2A.
   • Use a heatsink or active cooling if operating at high currents for extended periods.

Q: Can I use this driver with a sensorless BLDC motor?
A: Yes, the BLDC Driver 24W supports sensorless BLDC motors. However, ensure proper tuning of the control signals for optimal performance.

Q: What is the recommended PWM frequency for speed control?
A: A PWM frequency between 1kHz and 20kHz is recommended for smooth motor operation.

Q: Can I use this driver with a 12V power supply?
A: Yes, the driver supports input voltages from 5V to 40V, so a 12V power supply is compatible.

Q: How do I monitor the motor's speed?
A: Use the FG pin, which outputs a feedback signal proportional to the motor's speed. This signal can be read using a microcontroller or frequency counter.