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 Software