Automatic windshield de icer awd i
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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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Automatic windshield de icer awd i

Automatic Windshield De-Icer(AWD-I)

Group 20:

Adam Kambic

Michael Kistler

Patrick Yapo

Senior Design - Fall 2010



What is the awd i

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

Features and benefits

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

The awd i


Main Circuit Board

Photo-detector Circuit

Sensor Circuit

Transmitter Circuit



Block diagram

Block Diagram







Clock / LCD


Micro Controller

Wireless Receiver

Wireless Transmitter


Power Source

Battery Monitor

User Input

Resistive wires

Resistive Wires

  • Used 0.118 Ω/ft 24-gauge fiber glass insulated wire

11 ft = 1.298



Wireless communication

Wireless Communication

**Tested between two concrete walls

Temperature sensor lm35dt

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

Humidity sensor hih 4030 001

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

Pic comparison with radioshack temperature hygrometer

PIC Comparison with RadioShack Temperature/Hygrometer

Battery consumption resistive wires

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.

Battery consumption main sensors and photo detector boards

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

Battery consumption transmitter circuit

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

Ice sensing with a photo detector

Ice Sensing with a Photo-detector

Resistive wire vs temperature

Resistive Wire VS Temperature

Resistive wires i n action

Resistive Wires in Action

Future improvements

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

Future improvements continued

Future Improvements Continued…

  • Use lower resistance wires and higher quality window grade vinyl (3M Crystalline Automotive Film)



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