Child Safety Monitoring System

Jessica FreyEmily Hornbeck

Motivation 56,000 Children Injured Every Day 22,000 Children Die Every Year as a

Result of Injury 90% of Unintentional Injuries that

Occur in the Home are Preventable $347 Billion Spent on Healthcare

Due to Childhood Injuries Each Year

The home is one of the most common

places for childhood injury!

Water – Kitchen, Bathroom, Swimming Pool

Flames or Heat – Kitchen, Bathroom, Utility Rooms

Toxic Agents – Kitchen, Bathroom, Garage

Falling - Stairwells

Objectives

Create a Warning System to Alert Parents when Children are Entering Dangerous Areas of the Home

Device can Distinguish Between a Child and an Adult

Zones can be Designated as High, Medium, or Low Risk

Quick Response Time and Minimal Amount of False Alarms

System Flowchart

Photo-transistors

Light EmittingDiodes

Microcontroller Alarm

ControlSwitches

DoorwayConfiguration

From EmitterCircuitry

(Higher Height)

From EmitterCircuitry

(Lower Height)

To ReceiverCircuitry

(Higher Height)

To ReceiverCircuitry

(Lower Height)

32 ‘’

3' 6’’

6'’

InfraredSensor

ControlSwitch Box

High Risk

Medium Risk

Low Risk

Power On/Off

LED Infrared

5.1 KOhm

100KOhm

0.01 F

LM 555Timer

+5 V

0.01 F

Infrared Emitting Diode

84

7

6

2

5 1

3

Timer andEmitter

+ 5 V

20 Ohm

1 KOhm

1 F

5.1 KOhm

Receiver

Infrared

Collector

V Out

BasicX-24 Microcontroller

Simple, Straightforward Language Easy Debugging 8 Independent 10-bit Analog to

Digital Converters Sine Wave Generator for Alarm

Three Main Scenarios Adult Crossing Top Sensor First

Wait for Adult to Pass; No Alarm Adult Crossing Bottom Sensor First

Determine an Adult; No Alarm Child Crossing Bottom Sensor

Determine a Child; Alarm

Code Flowchart

MainCheck for

AdultWait 2 Seconds

Check forChild

Check forAdult

Wait 2 Seconds

No

Yes

Yes

Yes No

No

Alarm

Low Frequencyand Short Sound

Output

MediumFrequency

Sound Output

High Frequencyand Long Sound

OutputHigh

Med.

Low

FreqOut Function

Generates 2 Output Frequencies that Mix to Form a Chord-like Sound for a Specified Time

High Risk Zone -Mix 3500Hz and 7000Hz for 8 seconds

Medium Risk Zone-Mix 3000Hz and 6000Hz for 6 seconds

Low Risk Zone-Mix 2500Hz and 5000Hz for 4 seconds

Output Frequencies to a 4 Ohm Speaker

Testing Collected Two Sets of Data1. No Crossings2. Crossings

-Adult Crossing High Sensor First-Adult Crossing Low Sensor First-Baby Crossing

Tested High, Medium, and Low Settings

Results From No Crossings

1

29

A+

A-

A+

A-

= Alarm

= No Alarm

30 one minute trials with no crossings were tested

% error = errors * 100%

total trials

=3.33% error

Results for Sensor Crossings

0 0 15

15 15 0A-

A+

Adult Crossing Bottom

Adult Crossing Top

Baby Crossing

A+

A-

= Alarm

= No Alarm

error%=False Alarms*100%

Total Trials

= 0% error

False Alarms:

A+ for Adult Crossings

A- for Baby Crossings

15 trials for each main crossing scenario

Results of Risk Settings

10 10 10

10 10 10R

N

High Medium Low

N

R =

= Number of Trials

Number of Correct Results

10 trials for each setting were tested for correct duration and frequency output

0% error for each setting

It Worked!!! Ability to Distinguish Between

Children and Adults Few False Alarms Correct Alarm Outputs for the

Chosen Risk Settings Quick Response Time

Benefits Unobtrusive Settings can be Altered at Any Time

by the Parent Easily Enabled/Disabled with Power

Switch Helps Parents Keep an Extra “Eye”

on their Children

Commercialism Expand Design to Include Cabinets,

Drawers, etc. Implement Alarm into a Home

Speaker System Use Computer Interface to Replace

Control Switch Box