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

22 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

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

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

88 IR Sensor Design Model: Optek OPB 755TZ Internal Schematic of IR Sensor Photograph of IR Sensor

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

10 Impedance Sensor Design 5 V supply To MCU

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

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

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

14 Results and Performance All target specifications are from project proposal

15 Project Demo

16 Cost Analysis *Figures based on 10,000 units sold PROTOTYPE DEVELOPMENT COST Initial EstimateCurrent FiguresFinal Estimate Team Design Hours Labor Cost w/Fringe Benefits) $11,169$11,250$17,505 Parts Cost$239$255$280 COMPLETE PRODUCT COST ANALYSIS Initial EstimateFinal Estimate% Change Manufactured Parts Cost $140$6057.2% Cost Subtotal$457$ % Product Price$600$ % Profit Margin23.9%24%

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

18 Questions