Resurrecting a GPU cooling fan using a micro-processor and PWM

Trying to rescue a GPU cooling system containing a 12V 4-wire fan using a PWM signal from ATtiny85 and reading a voltage from ADC from a potentiometer knob. Ultimately building a 4-wire fan controller.

25kHz PWM on ESP8266: https://github.com/esp8266/Arduino/issues/4598

Arduino Code: https://gist.github.com/debsahu/795922a2429bb41c18aa083e38b6678d

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