ZK-PP1K PWM Pulse Frequency Duty Cycle Adjustable Module

Specifications

• Input Voltage: 3.3V - 30V DC (Anti-reverse protection included)
• Frequency Range: 1Hz - 150KHz
• Frequency Accuracy: ~2% (in each range)
• Duty Cycle Range: 0.00% - 100% (1% steps)
• Output Amplitude: Amplitude equals Input Voltage (e.g., 5V in = 5V signal out)
• Signal Load Capacity: < 30mA (Note: This is a Signal Generator, not a Power Driver.It cannot drive motors directly.)
• Display: LCD with backlight

      Control Modes:

• PWM Mode: Adjust Frequency & Duty Cycle.
• PULSE Mode: Adjust Positive Pulse Width (T1) & Negative Pulse Width (T2) times.
• Delay time: 0.000s - 9999s adjustable.

Applications

• Stepper Motor Driver Testing: Generate precise step pulses for TB6600 or A4988 drivers to verify motor movement before connecting a main controller.
• LED Dimming Development: Test brightness curves by sweeping duty cycle from 0-100% without flashing code to an Arduino.
• Servo Motor Calibration: Use the precise pulse width control (Pulse Mode) to find the exact min/max limits of your servo mechanism.
• Solenoid Valve Cycling: Set up automated ON/OFF cycles to endurance test solenoids or relays (using an external driver).
• Oscilloscope Training: A perfect, low-cost reference source for students learning to trigger and measure digital signals.

Project Evolution

      From Blinking LEDs to Industrial Control

• The Prerequisite (What you've built): You likely started with delay(1000) on an Arduino to blink an LED or move a servo. You know the pain of "blocking code" stopping your processor from doing other things.
• The Upgrade (What this unlocks): The ZK-PP1K acts as an Independent Timing Coprocessor. It frees your microcontroller from generating high-speed pulses. You can manually simulate a sensor input or clock signal to test how your code handles external interrupts, without needing a second Arduino.
• Effort Level: Beginner. No coding required. Just power it up, connect the output to your target, and press the buttons.

Wiring Guide

• ⚠️ CRITICAL WARNING: The Output Amplitude is equal to the Input Voltage. If you power this module with 24V, the signal output will be 24V. Do NOT connect a 24V powered ZK-PP1K directly to a 3.3V ESP32 or 5V Arduino input pin, or you will destroy the microcontroller. Use a level shifter or power the ZK-PP1K with the same voltage as your logic level (e.g., 5V).

Pin Mapping:

• V+ : Power Input Positive (3.3V - 30V)
• V- : Power Input Negative (GND)
• PWM : Signal Output (Square Wave)
• GND : Signal Ground (Common with V-)

Package Includes:

• 1x ZK-PP1K PWM Pulse Frequency Duty Cycle Adjustable Module

Frequently Asked Questions (FAQ)

• Can the ZK-PP1K drive a DC motor directly?
  No, the output current is limited to 30mA. You must connect the PWM output to a Motor Driver Module (like L298N) or a MOSFET module to drive a motor.
• What is the minimum frequency this module can generate?
  It can generate frequencies as low as 1Hz.
• Can I adjust the duty cycle while the output is running?
  Yes, changes to Duty Cycle or Frequency are applied immediately in real-time.
• Does the ZK-PP1K save my settings after power loss?
  Yes, the module has non-volatile memory and will remember the last set Frequency and Duty Cycle upon next power-up.
• What is the difference between PWM mode and PULSE mode?
  PWM mode sets Frequency and % Duty Cycle. PULSE mode allows you to set the specific time duration (seconds/milliseconds) for the High state and Low state independently.
• Can I use this to test a servo motor?
  Yes, but you must be careful. Standard servos expect a 50Hz signal with 1ms-2ms pulse width. You can configure this manually in PWM mode (Freq: 50Hz, Duty: 5-10%).
• Is the output signal pure sine wave or square wave?
  The output is strictly a Digital Square Wave.
• What happens if I short the output pins?
  The device has limited protection, but prolonged short circuits can damage the output transistor. Avoid shorting PWM to GND.
• Can I communicate with this module via UART/Serial?
  No, the ZK-PP1K is a standalone interface device; it does not have serial communication ports for external control.
• Does it support decimal frequency values like 12.5Hz?
  No, the resolution at low frequencies is typically 1Hz.
• How do I switch between Normal and Fine frequency modes?
  This specific model usually operates in a single unified range, automatically adjusting decimal points on the LCD for higher KHz ranges.
• Can I use a 9V battery to power it?
  Yes, a 9V battery is within the 3.3V-30V operating range and works perfectly for portable testing.
• Is the LCD backlight always on?
  Yes, the backlight is powered whenever the device is ON.
• What is the amplitude of the output signal?
  The output voltage amplitude tracks the input voltage. If Input is 12V, Output High is ~12V.
• Can I mount this in a panel?
  Yes, the ZK-PP1K has a "shell" enclosure with snap-fit tabs designed for rectangular panel cutouts.
• Does it come with a case?
  Yes, the "K" in ZK-PP1K typically denotes the version with the plastic shell/case included.
• Can I invert the signal?
  No, the signal is standard active-high. You would need an external NOT gate/inverter for inverted logic.
• Is this suitable for generating audio frequencies?
  It covers the audio range (20Hz-20KHz), but since it is a square wave, the sound will be "buzzy" (like 8-bit audio), not smooth like a sine wave.
• How accurate is the 150KHz limit?
  At the upper limit (150KHz), the waveform may start to show slightly rounded corners depending on the load, but the frequency remains accurate within tolerance.
• Does it support a delayed start?
  Yes, in PULSE mode, you can configure a delay time before the pulses begin.