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How to Control Servo with PWM?

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How to Control Servo with PWM?

2023-11-23 11:36:26

Controlling a servo motor with PWM (Pulse Width Modulation) is a widely used technique in various applications that require precise control over the motor's position. PWM allows you to adjust the motor's angle by varying the width of the electrical pulses sent to it. In this comprehensive guide, we will explain how to control a servo motor using PWM. By following these steps, you will be able to achieve accurate and smooth control over your servo motor.

Step 1: Understand PWM Basics

Before diving into the control process, it is important to have a basic understanding of PWM. PWM is a technique where the width of a periodic pulse is varied while keeping the frequency constant. By changing the width of the pulses, you can control the average amount of power delivered to the servo motor, which in turn determines its position.

Step 2: Choose the Right Hardware

To control a servo motor with PWM, you will need a microcontroller or a servo motor controller that supports PWM output. Ensure that the hardware you choose has the necessary capabilities to generate PWM signals with the required frequency and pulse width range.

Step 3: Connect the Servo Motor

Start by connecting the servo motor to the appropriate power supply. Most servo motors operate at 5V, so make sure to provide the correct voltage. Connect the servo motor's power and ground wires to the power supply, ensuring a secure and reliable connection.

Step 4: Connect the PWM Signal

Next, connect the PWM signal wire of the servo motor to the PWM output pin of your microcontroller or servo motor controller. This pin will generate the PWM signals that control the motor's position. Ensure a solid connection to avoid any signal loss or interference.

Step 5: Configure the PWM Signal

To control the servo motor, you need to configure the PWM signal. This involves setting the frequency and the pulse width range. The frequency determines how often the pulses are sent, while the pulse width range determines the range of angles the servo motor can achieve. Refer to the servo motor's datasheet or user manual to determine the appropriate frequency and pulse width range for your specific servo motor model.

Step 6: Code Implementation

In your microcontroller or servo motor controller, write the code to generate the PWM signal. This code should set the frequency and pulse width range according to the specifications provided by the servo motor's datasheet. Most microcontrollers have built-in PWM modules that simplify this process. Ensure that your code generates clean and accurate PWM signals to ensure precise control over the servo motor.

Step 7: Test and Calibration

Once the servo motor is connected and the PWM signal is configured, it's time to test and calibrate the motor. Follow these steps:

  1. Power On: Turn on the power supply connected to the servo motor.

  2. Initial Position: Send a PWM signal with a pulse width corresponding to the neutral position of the servo motor. This is usually around 1.5 milliseconds. The motor shaft should remain stationary at this position.

  3. Movement Range: Gradually increase or decrease the pulse width to observe the motor's movement. Most servo motors have a movement range of approximately 180 degrees. Ensure that the motor smoothly moves within this range without any jerks or vibrations.

  4. Fine-tuning: If necessary, adjust the pulse width to fine-tune the motor's movement and positioning. This step is crucial for achieving precise control.

  5. Feedback Check: If your servo motor has a position feedback device, such as a potentiometer, verify that the feedback signal matches the desired position. This step ensures accurate positioning and feedback control.


Controlling a servo motor with PWM provides precise and accurate control over its position. By understanding the basics of PWM, choosing the right hardware, connecting the servo motor, configuring the PWM signal, and implementing the code, you can effectively control your servo motor. Follow the test and calibration steps to ensure optimal performance. With PWM control, you can confidently incorporate servo motors into various applications, such as robotics, automation, and remote-controlled systems, where precise positioning is essential.

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