Simple AVR based PWM PC fan controller
This is a simple AVR based PWM PC fan controller.
The MCU is an ATtiny85.
Software in interrupt-driven. A potentiometer value is read by the ADC and then used to set the duty-cycle of a 8bits PWM, driving the fan’s speed.
The board is small (33x15mm) and is designed to be directly attached to a standard potentiometer.