preliminary design review automatic windshield wiper system michael whitfield anthony harris renaud...
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1
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
Microcontroller
MSP430
IR Sensor
Impedance Sensors
Speech Recognition
Input Signal Conditioning
Circuitry
Output Signal
ConditioningCircuitry
Wiper Control System
5
IR Sensor
EmitterReceiver
Windshield
• Model: OPB 770T• Mounted inside windshield behind rear view mirror• 100% reflectivity = No rain• <85% means rain or moisture is present
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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
Q 1
Q 2 N 2 2 2 2
V C C _ B A RR 1
1 k
V o u t
IR Sensor
MSP 430Analog to
Digital Converter
77
Impedance Sensors
Speed control: 2 options1st Schmitt Triggers
2nd option: MCU A/D comparator
5V Water closes
circuit
MCU
Speed Control
MCUComparator
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 DiagramPOWER ON
SYSTEMCHECK
IRSENSOR
IMPEDANCE SENSOR
Auto?
SYSTEMFAILURE
WIPERON
SPEECH?
Water? Water?
OK?
SPEED CONTROL
EXIT
10
System Integration
MCU
AutomobileWiper
System
WiperSwitch
High
Low
Intermittent
Park
ElectronicRelay
12 VSensors
Existing Automobile System
Design System
11
Test Apparatus
12
Test Apparatus (cont.)
13
Marketing and CostINITIAL ESTIMATE(MID-POINT)
ACTUAL (MID-POINT)
PROJECT ESTIMATE
REVISED PROJECT ESTIMATE (w/Voice Activation)
Team Design Hrs 206 hrs 162 hrs 412 hrs 460hrs
Labor Cost(@ $30.00/hr) $6,180 $4,860 $12,360 $13,800
(11% Increase)
Parts Cost (Prototype Design)
N/A N/A $239 $350
Parts Cost (Manufactured) N/A N/A $140 $205
Price N/A N/A $600* $800*
Profit Margin N/A N/A 16%* 15.4%*
*Figures based on 500 units sold
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TimelineTask Completion
DateTest all individual components 11/2Integration of sensors w/ Microcontroller 11/10Integration of Microcontroller w/ Motor 11/18Construct Test Apparatus 11/21Program Microcontroller 11/26Project 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….
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