REES52 DC 12V 5A PWM 4 Wires PC Fan Temperature Manumotive Speed Controller Module CPU High-Temperature Alarm with Buzzer and Probe for Arduino Heat Sink : Amazon.in: Industrial & Scientific
Arduino based 12V PWM Fan Controller
How to build an Arduino fan controller ᐅ Step by Step explanation
Hardware example (Arduino)
How to build an Arduino fan controller ᐅ Step by Step explanation
Arduino PWM-Fan Control - Automatic and Manually - Hackster.io