PWM Signal Generator Module – 1Hz–150kHz Adjustable Frequency and Duty Cycle

The PWM Signal Generator Module is a compact digital pulse generator designed to produce adjustable Pulse Width Modulation (PWM) signals for electronics testing, motor control, LED dimming, and DIY automation projects.

Featuring an LCD display and four independent control buttons, the module allows users to adjust the output frequency and duty cycle without programming or additional equipment.

Operating from 3.3V to 30V DC, the module generates a PWM signal with an output amplitude approximately equal to its supply voltage. Its adjustable frequency range of 1Hz to 150kHz makes it suitable for a variety of electronic control and testing applications.

The module automatically saves configured parameters, allowing previously selected settings to be restored after power interruption.

Key Features

• Adjustable PWM Frequency: Supports frequencies from 1Hz to 150kHz.
• Adjustable Duty Cycle: Allows control of PWM pulse width.
• Wide Operating Voltage: DC 3.3V–30V.
• LCD Display: Displays operating parameters for convenient adjustment.
• Four Control Buttons: Independent controls for frequency and duty cycle.
• Easy Adjustment: Short press for single-step changes and long press for faster adjustment.
• Automatic Parameter Saving: Retains configured settings after power interruption.
• Compact PCB Design: Suitable for electronics testing and embedded projects.
• Standalone Operation: No microcontroller programming required.

Technical Specifications

Control and Operation

The module features four independent buttons for adjusting the PWM output.

Frequency Adjustment

• Increase the output frequency using the frequency-up button.
• Decrease the output frequency using the frequency-down button.
• Short press to change the value incrementally.
• Long press to adjust the value more quickly.

Duty Cycle Adjustment

• Increase the duty cycle using the duty-cycle-up button.
• Decrease the duty cycle using the duty-cycle-down button.
• Short press for small adjustments.
• Long press for faster changes.

Configured parameters are automatically saved and restored when the module is powered on again.

Connection and Usage

The PWM generator requires a DC power supply and provides a PWM signal output.

Example: PWM Motor Speed Control

The module can provide an adjustable PWM control signal to a compatible motor driver or MOSFET switching circuit.

1. Connect the module to a suitable DC power supply.
2. Connect the PWM output to the control input of the motor driver.
3. Connect the signal grounds together.
4. Adjust the frequency and duty cycle to control the driver.

Important: The module is a signal generator, not a high-current motor driver. Motors and other power loads must be controlled through suitable driver circuitry.

Applications

• PWM Signal Testing
• DC Motor Speed Control with External Driver
• LED Brightness Control with Suitable Driver
• MOSFET Switching Circuits
• Electronics Laboratory Experiments
• Pulse Signal Generation
• Automation Control Systems
• Circuit Testing and Troubleshooting
• DIY Electronics Projects
• Educational Electronics Training

Important Notes

• The PWM output amplitude is approximately equal to the module supply voltage.
• Do not connect the output directly to 3.3V or 5V microcontroller GPIO inputs when the module is powered at a higher voltage.
• Use a suitable voltage divider, level shifter, or interface circuit when required.
• The output current is limited and is not suitable for directly powering motors, high-power LEDs, or other heavy loads.
• Use an external MOSFET, motor driver, or switching circuit for power applications.
• The output frequency accuracy is approximately ±2%, according to the supplied specifications.
• Confirm the terminal labels and polarity before connecting power.
• The module is designed for PWM signal generation and is not a general-purpose sine-wave function generator.

Package Includes

• 1 × PWM Signal Generator Module with LCD Display and Control Buttons