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Arduino Fan Control using High Frequency 25kHz PWM // 4-Wire CPU Fans - YouTube
Read fan speed with Arduino
Using a programmable system-on-chip for fan control - Embedded.com
Computer Cooling Fan Tachometer Wire – New Screwdriver
Fan Tachometer Schematic / Circuit Diagram
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3-Wire PC Fan Tips & Tricks - Codrey Electronics
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Fan Tachometer Open Collector Circuit
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Reading PC Fan RPM with an Arduino | The Makers Workbench