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Innovative Fan Speed Detector: Enhancing CPU Cooling through Optical Encoding

DESCRIPTION

This project presents an innovative fan speed detector that utilizes fan blades as optical encoders to measure the rotational speed, directly impacting cooling capacity for CPUs. By counting the number of pulses within a fixed timeframe, the device determines blade speed, ensuring efficient cooling and preventing overheating. The implementation includes various components such as sensors, infrared LEDs, and phototransistors, all integrated with LabVIEW for real-time display of RPM and voltage supplied to the fan. Calibration and error analysis ensure precise functionality despite sensor noise.

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Innovative Fan Speed Detector: Enhancing CPU Cooling through Optical Encoding

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Presentation Transcript

  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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