6 PWM-controlled fans
All six fans are controlled by PWM.
6 Fan Controller
Overview
An intelligent controller for up to six PC fans, based on the STM32F070 microcontroller. All six fans support PWM control, while four channels also provide supply-voltage adjustment for three-wire or two-wire fans.
The system combines configurable DC-DC power stages, temperature monitoring, fan speed measurement, a 240×240 IPS display and USB connectivity. Control software initially targets Windows, with the exchange protocol and other sources planned for release.
Personal project by Hoàng Duy. PCB design completed.
Key Features
4 adjustable-voltage channels
Four channels support supply-voltage adjustment for three-wire or two-wire fans.
128 linear voltage steps
128 steps of smooth, linear voltage adjustment.
P-channel MOSFET power stages
P-channel MOSFETs in the DC-DC converters allow almost lossless power transmission to the fans at 100% duty cycle.
Full DC-DC shutdown
Each DC-DC converter can be fully shut down.
Up to 4A per DC-DC output
DC-DC output currents up to 4A, with more than 15W per channel.
Continued operation on MCU failure
Designed for continued operation even when the microcontrollers fail.
Voltage monitoring
Sensors monitor both the DC-DC supply voltage and output voltage.
Up to 16 DS18B20 sensors
Two buses for digital temperature sensors, supporting up to 16 DS18B20 sensors.
On-board temperature sensing
Temperature sensors are built into the digital potentiometers and microcontroller.
PC temperature monitoring
Control software tracks the PC’s built-in motherboard, CPU, GPU and HDD temperature sensors.
Indicators & alarm buzzer
Power and error indicators plus an alarm buzzer.
240×240 IPS display
An IPS display with 240×240 resolution provides a local interface.
Accurate fan speed measurement
A 32.768kHz crystal supports accurate fan speed measurement.
USB connection
USB connectivity between the fan controller and PC.
Windows control software
Control software initially targets Windows. The exchange protocol and other sources are planned for release.
Flexible power options
Molex (12V + 5V), 12V power + USB, Molex + 12V power, or a single 5–18V power supply.
Automatic fan detection
Automatic configuration and detection of connected fans.
USB firmware updates
Firmware can be updated via USB.
2.5-inch HDD mounting
Mounting holes are compatible with a 2.5-inch HDD holder.
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