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Automatic Windshield Wiper System

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Automatic Windshield Wiper System Michael Whitfield Anthony Harris Renaud Moussounda Eric Williams Project Overview Automated Windshield Wiper System Improve safety by decreasing driver distraction Target Automobile Manufacturers/ After-market Customers Goals

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Automatic Windshield Wiper System

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  1. Automatic Windshield Wiper System Michael Whitfield Anthony Harris Renaud Moussounda Eric Williams

  2. Project Overview • Automated Windshield Wiper System • Improve safety by decreasing driver distraction • Target Automobile Manufacturers/ After-market Customers • Goals • Detect rainfall on windshield • Detect intensity of rainfall • Automatically activate windshield wipers once rainfall is detected 2

  3. Visual Overview

  4. Project Status Microcontroller is programmed Impedance and IR sensor signal conditioning circuitry developed Automobile wiper control system acquired Output Signal conditioning Circuitry Developed Demo apparatus built

  5. Design Approach Overview • High Level System Diagram • System Control Logic • IR Sensor Design • Impedance Sensor Design • Microcontroller/Automobile Interfacing • System Integration

  6. High Level System Diagram

  7. System Control Logic System Initialization ioinit(); Sensor Reading adc_value = read_adc(); Rain? No Yes Speed Control Motor Activation if (adc_value < SLOWL) if (adc_value < HIGHL) if (adc_value > HIGHL) if (adc_value >= INTL) intermittent_enable(); 7

  8. IR Sensor Design • Model: Optek OPB 755TZ Internal Schematic of IR Sensor Photograph of IR Sensor 8

  9. IR Sensor Integration Analog to Digital Converter 0-5V Windshield Receiver Emitter • 100% reflectivity (5V) = No rain • <85% reflectivity (4.25V) = Light rain • <70% reflectivity (3V) = Medium rain • <50% reflectivity (2.5V) = Heavy rain

  10. Impedance Sensor Design 5 V supply To MCU

  11. Sensitivity Control Design User adjustable resistance MCU A/D 5V Water closes circuit Impedance Sensor Input Circuit RC low pass filter 11

  12. System Integration Design System Sensors 12 V Electronic Relays MCU Existing Automobile System High Automobile Wiper System Low Wiper Switch Park Intermittent

  13. Microcontroller Interfacing Sensor Inputs ATMEGA8-16PU MCU Visual Feedback Relays

  14. Results and Performance All target specifications are from project proposal

  15. Project Demo

  16. Cost Analysis PROTOTYPE DEVELOPMENT COST COMPLETE PRODUCT COSTANALYSIS *Figures based on 10,000 units sold

  17. Remaining Work • Complete System Integration • Project Documentation • Final Report • Complete Demonstration

  18. Questions

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