Preliminary Design Review 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 –Voice-controlled system activation/deactivation (Future)

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 Microcontroll er MSP430 IR Sensor Impedance Sensors Speech Recognition Input Signal Conditioning Circuitry Output Signal Conditioning Circuitry Wiper Control System

5 IR Sensor Emitter Receiver Windshield 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

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

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

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

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

11 Test Apparatus

12 Test Apparatus (cont.)

13 Marketing and Cost INITIAL ESTIMATE (MID- POINT) ACTUAL (MID- POINT) PROJECT ESTIMATE REVISED PROJECT ESTIMATE (w/Voice Activation) Team Design Hrs 206 hrs162 hrs412 hrs460hrs Labor $30.00/hr) $6,180$4,860 $12,360$13,800 (11% Increase) Parts Cost (Prototype Design) N/A $239$350 Parts Cost (Manufactured) N/A $140$205 Price N/A $600*$800* Profit Margin N/A 16%*15.4%* *Figures based on 500 units sold

14 Timeline TaskCompletion Date Test all individual components 11/2 Integration of sensors w/ Microcontroller 11/10 Integration of Microcontroller w/ Motor 11/18 Construct Test Apparatus 11/21 Program Microcontroller 11/26 Project Integration 12/3

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….