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FSD – Fan Speed Detector

ME 102A Spring 2010 May 4, 2010 Jennifer Lew Stephen Tu. FSD – Fan Speed Detector. Motivation. Fans c ool a computer Rotational S peed  C ooling C apacity  CPU would almost instantly melt. CPU: http://hardforum.com/showthread.php?t=1423185

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FSD – Fan Speed Detector

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  1. ME 102A Spring 2010 May 4, 2010 Jennifer Lew Stephen Tu FSD – Fan Speed Detector

  2. Motivation • Fanscoola computer • RotationalSpeedCooling Capacity • CPU would almost instantly melt CPU: http://hardforum.com/showthread.php?t=1423185 Fan Grid: http://forums.legitreviews.com/about12716.html

  3. How It Works • Idea: Use fan blades as an Optical Encoder • By measuring the number of pulses in a fixed period of time, can determine speed of blades Rotary: http://hades.mech.northwestern.edu/index.php/Rotary_Encoder Fan: http://computershopper.com/shoptalk/components/silverstone-fm83-cram-more-fan-into-the-same-space

  4. Implementation • Fan • Voltage Supplied • Current Supplied • Impellers • Sensors • Infrared LED • Phototransistor • Circuit: Resistors, Voltage Supplied • LabVIEW VI • Input number of impellers • Implements GenerateCalibrationCurve() • Displays RPM, voltage supplied to fan • Error Analysis • Sensor is noisy, so must take many samples andconsider confidence intervals Procedure for calibrating fan IR LED: http://www.solarbotics.com/assets/images/ir-led/ir-led_pl.jpg Phototransistor: http://farm3.static.flickr.com/2325/2105641666_1487ce594e.jpg

  5. Layout Measurement Power Breadboard

  6. Results

  7. Issues

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