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Photoresistor Sun Sensor Experiment

Photoresistor Sun Sensor Experiment. By: Noah K. Stokely NASA Space Grant – ASCEND! Mentors: Dr. Ronald Madler , Jack Crabtree April 17, 2010. Overview. Project Goals Hardware Description/Operation Flight Results Future Work Questions. Project Goals.

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Photoresistor Sun Sensor Experiment

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  1. Photoresistor Sun Sensor Experiment By: Noah K. Stokely NASA Space Grant – ASCEND! Mentors: Dr. Ronald Madler, Jack Crabtree April 17, 2010

  2. Overview • Project Goals • Hardware Description/Operation • Flight Results • Future Work • Questions

  3. Project Goals • Determine the orientation of the payload • Develop more of an understanding of the dynamics of a balloon flight • Prove the usability of photoresistors as sensors 4/17/2010

  4. Hardware Description • Six photoresistors mounted flush with the surfaces of two wedges and one cube. Oriented on the surface such that azimuth and elevation angles can be found. 4/17/2010

  5. Operation +5V R R GND To ADC In 70o Photoresistor • If both photoresistors see equal light intensity, the voltage reading will be 2.5V. • Depending on the orientation of the wedge, the voltage reading will fluctuate linearly about 2.5V. • Voltage reading will allow for the angle determination with respect to the sun.

  6. Flight Results

  7. Flight Results

  8. Flight Results

  9. Future Work • Further analyze the data and continue to develop a MATLAB algorithm to read in the data and determine an payload orientation for each point. • Use an Fast Fourier Transform on the flight data to see the dominating oscillation frequency of the azimuth angle. • Implement an accelerometer to develop an understanding of the g-forces during flight.

  10. QUESTIONS??

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