Giorgos Lazaridis writes:
Using a potentiometer, i control the speed of a PC fan, from 350rpm up to it's max speed (1300 rpm). The fan is a 3-wire PC fan. Using the Pulse-Stretching method, i get accurate RPM feedback, twice a second, and display them on an LCD display.
PWM 3-Wires Fan Controller with RPM feedback - [Link]
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