691 likes | 2.49k Views
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
E N D
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 • Detect rainfall on windshield • Detect intensity of rainfall • Automatically activate windshield wipers once rainfall is detected 2
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
Design Approach Overview • High Level System Diagram • System Control Logic • IR Sensor Design • Impedance Sensor Design • Microcontroller/Automobile Interfacing • System Integration
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
IR Sensor Design • Model: Optek OPB 755TZ Internal Schematic of IR Sensor Photograph of IR Sensor 8
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
Impedance Sensor Design 5 V supply To MCU
Sensitivity Control Design User adjustable resistance MCU A/D 5V Water closes circuit Impedance Sensor Input Circuit RC low pass filter 11
System Integration Design System Sensors 12 V Electronic Relays MCU Existing Automobile System High Automobile Wiper System Low Wiper Switch Park Intermittent
Microcontroller Interfacing Sensor Inputs ATMEGA8-16PU MCU Visual Feedback Relays
Results and Performance All target specifications are from project proposal
Cost Analysis PROTOTYPE DEVELOPMENT COST COMPLETE PRODUCT COSTANALYSIS *Figures based on 10,000 units sold
Remaining Work • Complete System Integration • Project Documentation • Final Report • Complete Demonstration