ProMax PSG01 PWM Signal Generator with Display

Specifications

• Operating Voltage: 3.3V – 30V DC
• Frequency Range: 1Hz – 150kHz (Adjustable)
• Frequency Accuracy: ~2%
• Duty Cycle Range: 0 – 100% (1% steps)
• Output Amplitude: PWM amplitude equals the supply voltage
• Output Current: 5-30mA (Signal Level Only - Do NOT drive motors directly)
• Communication: TTL Serial (UART) supported for external control
• Dimensions: 79mm x 43mm x 26mm
• Mounting Cutout: 71mm x 39mm
• Display: High-contrast LCD with backlight

Applications

• Motor Control: precise speed regulation for DC motor drivers (L298N, BTS7960).
• Lighting: Dimming control for LED strips and grow lights.
• Lab Testing: Injecting clock signals into microcontroller circuits for debugging.
• Industrial Automation: Simulating sensor outputs for PLC input testing.
• Solenoid Valve Control: Testing actuation frequency and hold strength.

Project Evolution

       From Coding to Hardware Control

• Past Projects (Prerequisites): If you have mastered blinking an LED using delay() in Arduino or used a potentiometer to blindly change a motor's speed, you are ready for this upgrade.
• Feature Upgrade: The PSG01 allows you to generate complex signals without writing a single line of code. It frees up your microcontroller from generating PWM, allowing the MCU to focus on sensor processing or Wi-Fi comms. It also acts as a "sanity check" tool—if your motor driver works with the PSG01 but not your Arduino, you know your code is the issue.
• Effort Level: Beginner. No soldering required if using the screw terminals.
• Hardware Needed: You will need a DC Power Supply (e.g., 12V Adapter) and the device you want to control (e.g., a Motor Driver Module).

Virtual Technician & Wiring Guide

• ⚠️ CRITICAL WARNING: This is a Signal Generator, not a Power Supply. The output current is limited to ~30mA. You cannot connect a motor directly to the PWM pins. You must connect the PWM output to the Input pin of a Motor Driver or the Gate of a MOSFET.

Pin Mapping:

• VIN+: Power Supply Positive (3.3V - 30V)
• VIN-: Power Supply Ground (GND)
• PWM: Signal Output (Connect to Driver Input)
• GND: Signal Ground (Common Ground required)

Package Includes

• 1 x ProMax PSG01 PWM Signal Generator with Display

Frequently Asked Questions (FAQ)

• Can I power a DC motor directly from this module?
  No, the output current is too low (<30mA). You must use a motor driver or MOSFET.
• Does it save the settings when power is turned off?
  Yes, the module has non-volatile memory and remembers the last Frequency and Duty Cycle settings.
• What is the maximum voltage I can input?
  The absolute maximum is 30V DC. We recommend running it between 5V and 24V for stability.
• Can I use this to dim a 230V AC light bulb?
  No, this is a DC device. Connecting it to AC mains will destroy the unit immediately.
• How do I change the frequency quickly?
  Press the Freq+ or Freq- buttons. Long-pressing the button will accelerate the value change.
• Does it support Serial communication?
  Yes, there are TX/RX pads on the back for TTL serial control (9600 baud).
• What is the signal amplitude voltage?
  The output signal voltage is approximately equal to the input supply voltage (Vin).
• Can I use this with a 3.3V ESP32?
  Yes, but you must power the PSG01 with 3.3V to ensure the output logic level matches the ESP32.
• Is the display backlit?
  Yes, the LCD comes with a blue backlight for visibility in low-light conditions.
• What is the frequency step resolution?
  It varies by range: 1Hz steps for low frequencies, automatic kHz adjustment for higher ranges.
• Can it generate a Sine Wave?
  No, this module generates Square Waves only.
• How do I mount this in a box?
  It has a snap-in panel mount design. Cut a rectangle of 71mm x 39mm and push the module in.
• Is the ground isolated?
  No, the VIN- and Output GND are common.
• Can I use it to test a servo motor?
  Standard servos need a specific 50Hz PWM with 1-2ms pulse width. You can manually set this, but a dedicated Servo Tester is easier.
• What happens if I short the output pins?
  The unit has limited protection, but prolonged short circuits can damage the output transistor.
• Why is my motor humming but not spinning?
  The frequency might be too high or duty cycle too low. Try lowering the frequency to 100Hz-1kHz.
• Can I invert the signal?
  No, the hardware output is non-inverted.
• Does it come with wires?
  No, it has screw terminal blocks. You need to provide your own hookup wires.
• What is the DOWN button for?
  It decreases the selected value (Frequency or Duty Cycle).
• Can I calibrate the frequency accuracy?
  No, the crystal oscillator is fixed, but it is accurate enough (approx 2%) for most control applications.