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Smart Climate Controller SCC. Project 6 Robin O ECE445 Senior Design July 15, 2005. Introduction. Background. About 30 children die each year from heat and entrapment A child’s body temperature can increase 3-5 times faster than an adult’s

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smart climate controller scc

Smart Climate ControllerSCC

Project 6

Robin O

ECE445 Senior Design

July 15, 2005

background
Background
  • About 30 children die each year from heat and entrapment
  • A child’s body temperature can increase 3-5 times faster than an adult’s
  • While it is 93°F outside, the inside of a vehicle can reach 120°F in 20 minutes and 140°F in 40 minutes even with a cracked window

*Based on findings from Safe Kids Worldwide

objective1
Objective
  • To create a basis for an automatic climate control system in vehicles to protect unattended passengers from extreme temperatures
features
Features
  • Automatically engages/disengages via vehicle key
  • Uses CO2 sensor for more accurate decisions (350-5000 ppmCO2)
  • Constantly monitors temperature and adjusts accordingly
  • Simple and inexpensive components and circuitry
benefits
Benefits
  • Protects children, the disabled, elders, valued animals and or pets
  • Takes vehicle security precautions by locking doors and closing windows
  • Fully automated and easily disengaged
  • Simple and cost efficient
execution
Execution
  • Emulates driver’s key in or out of the ignition
  • SCC engages when key is out of the ignition
  • SCC disengages when key is inserted into the ignition
sensor circuits
Sensor Circuits
  • Senses both the CO2 concentration levels and the temperature inside the vehicle
  • Temperature sensor detects 60°F and 70°F
  • CO2 detects any increase in concentration levels (at least 350 ppm minimum)
microcontroller
Microcontroller
  • Monitors both the CO2 concentration levels and the temperature inside the vehicle
  • Begins monitoring temperature when CO2 level rises, or when a passenger has been detected
  • Begins cooling when temperature rises above 70°F, stops cooling below 60°F
operations
Operations
  • Emulates the ignition, air-conditioning, power door locks, and the power windows
  • Consists of an array of LEDs
environment
Environment

Volume I

Volume II

12”x12”x6”

864 cubic inches

20”x12”x11”

2640 cubic inches

environment1
Environment

Volume I

Volume II

12”x12”x6”

864 cubic inches

20”x12”x11”

2640 cubic inches

components
Components
  • Microcontroller: Microchip PIC16F877A
  • CO2 Sensor: Figaro Engineering TGS4161
  • Temperature Sensor: National Instruments LM19CIZ
co 2 sensor
CO2 Sensor

The Figaro TGS4161 CO2 Sensor

co 2 sensor2
CO2 Sensor

CO2 Sensor Ranges

build results functionality
Build Results/Functionality
  • Once completed, the SCC was able to:
      • Turn on via the key emulator switch
      • Detect at least a 87.06ppm increase in CO2
      • Detect when the temperature rises above 79.5°F
      • Begin a sequence of events to turn on the ignition, the A/C, lock the doors, and to roll up the windows
      • Detect when the temperature falls below 79.5°F
      • Turn on the A/C when the temperature was above 79.5°F and to turn off the A/C when the temperature was below 79.5°F
scaling approximating
Scaling & Approximating

*According to Family Practice Notebook, LLC

scaling approximating1
Scaling & Approximating

*Using Vital Lung Capacity (L) = 0.041h – 0.018 a – 2.69 where h is height (cm) and a is age (yrs) from

regentsprep.org

**Results here shown using average male height of 69.1in. and average female height of 63.7in. and 45

years as an average adult age according to pediatrics.about.com

scaling approximating results
Scaling & Approximating: Results
  • A 4 year old child would be detected after approximately 276 breaths have been taken in mid-sized sedan with about 172,800 cubic inches of interior volume
  • This is about 6.9 minutes after the car has been turned off
assumptions
Assumptions
  • Vehicle requires power door locks and power windows
  • Vehicle needs to have an automatic transmission
  • The key will not be left in the ignition without the engine running
  • There is always sufficient gas
  • The passenger, if under age, will not attempt to drive the car once the ignition is on
room for expansion
Room For Expansion
  • Application of the SCC to cold weather using the heater
  • Application of the SCC to homes or other housing types with multiple rooms for energy and cost efficiency
credits to
Credits To…
  • Professor Gary Swenson
  • Professor Scott Carney
  • Professor Jennifer Bernhard
  • Tim O’Connell
  • Alex Spektor