PWM 4-Wire Fan Speed Controller DC 5V/12V Temp & RPM Display
PWM 4-Wire Fan Speed Controller DC 5V/12V Temp & RPM Display
PWM 4-Wire Fan Speed Controller with Temperature & RPM Display
Take full command of your cooling setup with this intelligent PWM Motor Driver Fan Speed Controller. Designed for 4-wire PWM fans, this compact module automatically adjusts fan speed based on real-time temperature readings — keeping your equipment running efficiently and quietly. With a high-definition digital display and intuitive encoder adjustment, professional-grade thermal management has never been more accessible.
Made in Mainland China.
Key Features
- Plug-and-Play USB-C Power: Powered via USB-C port — compatible with standard smartphone chargers and power banks. No additional power supply needed for 5V operation.
- Smooth, Linear PWM Control: When temperature reaches your preset threshold, the PWM duty cycle ramps linearly and smoothly from 10% to 100%, delivering precise, stepless airflow adjustment.
- HD Digital Display: Toggle between live temperature and current RPM readings with a single button press for at-a-glance status monitoring.
- Encoder Adjustment: Fine-tune your temperature thresholds quickly and accurately using the onboard rotary encoder.
- Broad Compatibility: Works with a wide range of 4-wire PWM fans — ideal for computer cooling, server rooms, motor cooling, greenhouses, aquariums, and more.
- Configurable Output Frequency: Default 25 kHz PWM output frequency is adjustable to suit various fan models.
Technical Specifications
| Operating Voltage | 5V via USB Type-C | 12V via terminal |
| Adjustment Method | Rotary encoder |
| Maximum Output Current | 5A (8W via Type-C port) |
| Output Frequency | 25 kHz (configurable) |
| Temperature Range | -25°C to 120°C |
| L-Value Range | -25°C to 119°C |
| H-Value Range | -24°C to 120°C |
| Temperature Recovery Range | 0–15°C |
| Temperature Probe | NTC 10K3950B, 30 cm cable |
| Display Toggle | Short press to switch between temperature and RPM |
| Color / Material | Black / PCB |
What's in the Box
- 1× 4-Wire PWM Fan Speed Controller Module (with NTC temperature probe)
Note: Color may vary slightly due to lighting and display differences. Measurement tolerance is ±1–3 cm.
For guidance on safe electrical practices when working with motor driver circuits and electronic modules, refer to OSHA's Electrical Safety guidelines.
Frequently Asked Questions
Q: What types of fans are compatible with this PWM fan speed controller?
A: This controller is designed for standard 4-wire PWM fans, including those used in PC cases, server racks, motors, greenhouses, and aquarium setups. It outputs a 25 kHz PWM signal (configurable), which is compatible with most modern 4-wire PWM computer and industrial cooling fans.
Q: Can I power this fan controller with a regular USB charger or power bank?
A: Yes. The module powers via a USB Type-C port at 5V, supporting up to 8W output in this mode — making it compatible with most standard smartphone chargers and power banks for convenient, plug-and-play use. For higher-current applications, connect 12V via the onboard terminal.
Q: How does the automatic temperature-based speed control work?
A: You set your desired low (L) and high (H) temperature thresholds using the rotary encoder. When the measured temperature rises to the L threshold, the PWM duty cycle begins increasing linearly from 10%. By the time the H threshold is reached, the fan runs at full 100% speed. This smooth, proportional response avoids sudden speed jumps and keeps your equipment optimally cooled.
Q: How do I switch between temperature and RPM on the display?
A: Simply press the display button briefly (short press) to toggle between the real-time temperature reading and the current fan RPM. This lets you monitor both key parameters without any additional equipment.