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Sound-Responsive Car: A Robotic Butler Concept

This project, presented by Nicholas Wang and Tricia Inamine on April 28, 2001, aims to develop a car that can home in on sounds, demonstrating real-world applications as a toy or personal robotic butler. The design integrates microphones, amplifiers, and motor controls, utilizing the Motorola HC12 for logic processing. The system averages sound inputs from multiple microphones to navigate towards the loudest sound source. Challenges such as microphone output and memory limitations were addressed through innovative solutions. Recommendations for future enhancements include better microphones and a more powerful sound generator.

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Sound-Responsive Car: A Robotic Butler Concept

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  1. Car That Responds To Sound Presented By: Nicholas Wang Tricia Inamine April 28, 2001 TA Shao Hsia Prof Gary Swenson

  2. Objective • Main objective • To create a car that will home in on a sound • Real world applications • As a toy or as a personal robotic butler • Personal accomplishments • Opportunity to experiment with robotics

  3. Original Design • The objective • Initial: Respond to a clap • Final: Home into a sound

  4. Project Design Microphone Amplifier Left Motor Right Motor Microphone Sound Generator HC12 LM18200

  5. Sound Generator

  6. Sound Generator

  7. Microphone Amplifier

  8. Microphone Amplifier

  9. Averaging Algorithm • Averages previous 64 samples • Provides a representation of signal power • Three 64-byte buffers • Three two byte sums • Two operations provide average computation

  10. Motorola HC12 Logic Design Turn Left Left Microphone If left is highest Center Microphone If center is highest Compared Go Forward If right is highest Right Microphone Turn Right None > Threshold Note: All data is averaged before compared

  11. Motorola HC12 • A to D converter • Analysis of input data • Wait sequence • PWM output

  12. Motor Control 5 LM18200 LM 1820010 6 L Motor PS2 PP0 HC-12 PS3 PP1 HC12 12 volt 5 LM18200 4 2,10 6 5 LM18200 LM 1820010 6 MOTOR R Motor

  13. Motor Control • LM18200 by National Semiconductor • Provides sufficient power to drive motors

  14. Final Result

  15. Challenges and Solutions • Challenge: Microphone output • Solution: Create a microphone pre-amplifier • Challenge: Lack of memory space on the HC12 • Solution: Optimized code, lowered the amount of input data • Challenge: Microphone capabilities • Solution: Create cones

  16. Recommendations • Use better microphones • Create a louder sound generator • Create a brake output to prevent creeping forward during idle stage

  17. Questions?

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