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Automatic Windshield De- Icer (AWD-I)

Automatic Windshield De- Icer (AWD-I). Group 20: Adam Kambic Michael Kistler Patrick Yapo Senior Design - Fall 2010. Introduction. What is the AWD-I?. Motivation for the project Basic operation Set time Wireless communication override Check Sensors Redundancy of ice/frost sensing

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Automatic Windshield De- Icer (AWD-I)

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  1. Automatic Windshield De-Icer(AWD-I) Group 20: Adam Kambic Michael Kistler Patrick Yapo Senior Design - Fall 2010

  2. Introduction

  3. What is the AWD-I? • Motivation for the project • Basic operation • Set time • Wireless communication override • Check Sensors • Redundancy of ice/frost sensing • Battery monitoring and protection

  4. Features and Benefits • Controllable clock • Use of the car’s battery • Battery Monitoring circuit for added protection • Temperature and humidity sensors • Photo-detector circuit • Wireless communication for user override • No wasted time de-icing in the morning • Simplified user input • Easy installation • Can be adjusted for any type of vehicle

  5. The AWD-I Main Circuit Board Photo-detector Circuit Sensor Circuit Transmitter Circuit

  6. Design

  7. Block Diagram Heater Element Temperature Photo-detector Relay Humidity Clock / LCD Sensors Micro Controller Wireless Receiver Wireless Transmitter Board Power Source Battery Monitor User Input

  8. Resistive Wires • Used 0.118 Ω/ft 24-gauge fiber glass insulated wire 11 ft = 1.298

  9. Testing

  10. Wireless Communication **Tested between two concrete walls

  11. Temperature Sensor(LM35DT) • Needs to be accurate to within ± 1° C of commercial grade reader • Linear voltage output (+250mV at 25° C) with a +10mV scale per degree C + 24.2

  12. Humidity Sensor(HIH-4030-001) • Close to linear voltage output • From datasheet: V vs Humidity at 19.4° C V vs Humidity at 20° C

  13. PIC Comparison with RadioShack Temperature/Hygrometer

  14. Battery Consumption – Resistive Wires • Tested for resistive wire heating • Assumed average 12 Volt battery (40 Amp-hr rating) • Testing done for time (hours) taken to deplete battery from 12 VDC to 11 VDC.

  15. Battery Consumption-Main, Sensors, and Photo-detector Boards • Current draw measured with all boards powered and LED lighting up on the Photo-detector board Main Printed Circuit Board (PCB) = 952.4 hrs

  16. Battery Consumption-Transmitter Circuit • Testing based of assumption that AA batteries have a 2,000 mA-hr lifetime: • Transmitter circuit has a 30 mA consumption when powered = 66.667 hrs

  17. Ice Sensing with a Photo-detector

  18. Resistive Wire VS Temperature

  19. Resistive Wires in Action

  20. Future Improvements • Clocking issue • Add a clock (DDR PLL) • Low power and current consumption • Separate power system • More accurate than using PIC programming • Transmitter power consumption • Add an on/off switch or use a plug-in adapter to power the circuit • Make all components of circuit useable in extreme cold weather or add low power heating unit

  21. Future Improvements Continued… • Use lower resistance wires and higher quality window grade vinyl (3M Crystalline Automotive Film)

  22. Sources • TFD Products - www.tfdinc.com/images/Transparent%20heaters%2009.pdf • TechLab– www.techlib.com/reference/batteries.html • Lukas Tutorial – www.pitt.edu/~sorc/robotics/Lukas%20PIC%20Tutorial.doc

  23. Questions?

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