Link to page: http://pcbheaven.com/circuitpages/PWM_3_Wires_Fan_Controller_with_RPM_feedback
Using the pulse stretching method, i control a simple PC 3-wire PWM fan, and get simultaneously rpm feedback from it, twice a second. With PWM pulses, i achieve really slow rpms, down to 350rpm!!! And no matter what, the fan can never be stalled unless it is broken or mechanically blocked.
See the complete article, with the schematic circuit and the PIC firmware to download, at:
http://pcbheaven.com/circuitpages/PWM_3_Wires_Fan_Controller_with_RPM_feedback
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