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Preliminary Design Review

Preliminary Design Review. 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

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Preliminary Design Review

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  1. Preliminary Design Review 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 • Voice-controlled system activation/deactivation (Future) 2

  3. Project Status • Online project management • IR sensor, Humidity sensor, MSP430(Microcontroller) ordered and obtained • Test apparatus designed • Impedance sensor designed, built, and tested • Project budget/hours updated • Project scope fully defined

  4. High-Level System Diagram IR Sensor Output Signal Conditioning Circuitry Microcontroller MSP430 Input Signal Conditioning Circuitry Impedance Sensors Speech Recognition Wiper Control System

  5. IR Sensor Windshield Receiver Emitter • Model: OPB 770T • Mounted inside windshield behind rear view mirror • 100% reflectivity = No rain • <85% means rain or moisture is present

  6. IR Sensor Integration • Turn current output into a voltage • Feed voltage through A to D converter • Microcontroller takes digital output from A to D converter and makes decisions IR Sensor MSP 430 Analog to Digital Converter

  7. Impedance Sensors Speed Control Speed control: 2 options 1st Schmitt Triggers 2nd option: MCU A/D comparator MCU Water closes circuit Copper Tape 5V MCU Comparator 7

  8. Microcontroller & Control Logic • 14 I/O pins • 16-MIPS performance • 16-bit Sigma Delta Analog-to-Digital converter • LED display

  9. Software Block Diagram POWER ON SYSTEM FAILURE EXIT Auto? SPEECH? SPEED CONTROL SYSTEM CHECK OK? WIPER ON Water? Water? IMPEDANCE SENSOR IR SENSOR 9

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

  11. Test Apparatus

  12. Test Apparatus (cont.)

  13. Marketing and Cost *Figures based on 500 units sold

  14. Timeline

  15. Problems • Interfacing with the wiper motor control system • Degradation of exposed impedance sensors • Sunlight interference of IR sensor performance

  16. Future Work • Addition of speech recognition capabilities • Activation of window control • Activation of headlights • Fog detection

  17. Questions If you build it, they will come….

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