Zk-pp2k Manual

It literally switches the input voltage to the output. If you feed it 12V, the output "high" is 12V.

Use the FREQ+ / FREQ- and DUTY+ / DUTY- buttons to adjust values. Zk-pp2k Manual

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. It literally switches the input voltage to the output

This is the core of the "PP2K" integration. Zk-pp2k Manual

Use PWM mode at ~20KHz to control motor speed without the high-pitched "whine". Solenoid Valve Trigger: