Smart Car Seat

1
Smart Car Seat

• ECE 345 Senior Design Project

2
Introduction

• Group 5
• Jason Carter
• J.D. Johnson
• Steve Kopchik

3
Objective and Background

• Our objective was to design and build a childs
  car seat that would detect the presence of a
  child left alone in conditions that could cause
  hypothermia.

4
Background

• According to www.kidsandcars.org

5
Original Design

• Step Down Converter
• Car on/off sensor
• Belt Sensor
• Weight Sensor
• Temperature Sensor
• Alarm Stage (Omitted)

6
Original Block Diagram
7
Car on/off sensor

• Simple Switch

8
Belt Sensor

• Already in most cars
• Our method similar to standards

9
Weight Sensor

• Mechanical Design

10
Testing
11
Results
12
Temperature Sensor Design
13
Temperature Sensor Schematics
14
Testing

• Placed in different atmospheres and allowed to
  reach ambient temperature.
• Voltage reading taken at output of transistor and
  output of voltage divider

15
Results
16
Additions

• Dashboard Warning Light

17
Warning Light Schematics
18
Overall Challenges

• Temperature Sensor
• Digital input threshold vs.
• temperature output gradient
• Breadboard and op-amp noise

19
Solutions

• Increase temperature transistor output gradient
• Hardwire circuit in closed box
• Use better op-amp components
• Integrate Lowpass/noise filter between stages

20
Overall Successes

• Ignition Switch
• Seatbelt Sensor
• Weight Sensor
• Warning Light

21
Recommendations

• Integrate Power supply from car
• Integrate Warning Light in Car
• Design output stages

22
Summary

• This system works with very few problems
• The problems that were encountered were solved
  and could be integrated with advancement of the
  project.

23
Final Block Diagram