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Automatic Windshield Wiper System - PowerPoint PPT Presentation


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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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Presentation Transcript
automatic windshield wiper system
Automatic Windshield Wiper System

Michael Whitfield

Anthony Harris

Renaud Moussounda

Eric Williams

project overview
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
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
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 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
IR Sensor Design
  • Model: Optek OPB 755TZ

Internal Schematic of IR Sensor

Photograph of IR Sensor

8

ir sensor integration
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
Impedance Sensor Design

5 V supply

To MCU

sensitivity control design
Sensitivity Control Design

User adjustable

resistance

MCU

A/D

5V

Water closes

circuit

Impedance Sensor

Input Circuit

RC low pass filter

11

system integration
System Integration

Design System

Sensors

12 V

Electronic

Relays

MCU

Existing Automobile System

High

Automobile

Wiper

System

Low

Wiper

Switch

Park

Intermittent

microcontroller interfacing
Microcontroller Interfacing

Sensor Inputs

ATMEGA8-16PU

MCU

Visual Feedback

Relays

results and performance
Results and Performance

All target specifications are from project proposal

cost analysis
Cost Analysis

PROTOTYPE DEVELOPMENT COST

COMPLETE PRODUCT COSTANALYSIS

*Figures based on 10,000 units sold

remaining work
Remaining Work
  • Complete System Integration
  • Project Documentation
  • Final Report
  • Complete Demonstration