While this guide covers 95% of typical use cases, you may want the official PDF for wiring diagrams or regulatory certifications.
If the manual is not available for free, beware of third-party websites charging for it – ZKTeco distributes manuals freely.
The main IC (located under the board or on the bottom) gets hot above 3A.
Introduction
The ZK-PP2K is a highly versatile, intelligent constant current, constant voltage (CC/CV) buck power supply module. Known for its affordability and precision, it’s a favorite among hobbyists, electronics engineers, and battery enthusiasts for projects ranging from driving high-power LEDs to charging lithium-ion batteries. However, due to its multifunction interface and complex calibration requirements, many users find themselves searching for a clear, comprehensive Zk-pp2k Manual.
If you have just purchased this module and are staring at a blinking blue OLED screen with no idea how to set the current limit or calibrate the voltage, you have come to the right place. This manual covers everything from the initial wiring diagram to advanced calibration steps.
Before diving into the button sequences, let’s review the hardware specifications.
The ZK-PP2K is a digitally controlled buck (step-down) converter. This means the output voltage must always be lower than the input voltage. It features a rotary encoder for navigation and a 0.96-inch OLED display.
Key Specifications:
What’s in the box (Usually):
Plug the 5V DC adapter into a surge-protected outlet. Do not plug the device into a power strip shared with heavy machinery (motors, refrigerators) as voltage fluctuations can damage the fingerprint sensor.
You can manage users directly on the device or via software. Here is the manual device method:
