TV Watching Safety Distance Enforcer Dr. Abdelhafid Bouhraoua Mr. Kamel Chenaoua Dr. Abdelhafid Bouhraoua Mr. Kamel Chenaoua.

TV Watching Safety Distance Enforcer

TV Watching Safety Distance Enforcer

Dr. Abdelhafid BouhraouaMr. Kamel Chenaoua

Dr. Abdelhafid BouhraouaMr. Kamel Chenaoua

OutlineOutline

• Aim of the Project• Principle of Operation• The Components• Implementation• Issues• Competition• Perspective

• Aim of the Project• Principle of Operation• The Components• Implementation• Issues• Competition• Perspective

Aim of the ProjectAim of the Project

To provide a way that prevent children from watching TV from a close distance to safeguard their

eyes health

To provide a way that prevent children from watching TV from a close distance to safeguard their

eyes health

Principle of OperationPrinciple of Operation

From ANT

To TV

Distance Monitoring Device

Distance Monitoring Device

From ANT

To TV

• Distance Measuring Device Continuously Monitors Distance to closest Object (Body) in Range

• If Object Detected: Turn Off Antenna Input

• Distance Measuring Device Continuously Monitors Distance to closest Object (Body) in Range

• If Object Detected: Turn Off Antenna Input

Distance Monitoring Device

Distance Monitoring Device

How Does it WorkHow Does it Work

ComponentsComponents

• Distance measuring sensors• Electrically controlled On/Off switch• Microcontroller with communication

means to interface the sensors

• Distance measuring sensors• Electrically controlled On/Off switch• Microcontroller with communication

means to interface the sensors

Distance Sensors- infrared -

Distance Sensors- infrared -

• Digital– Parallel or Serial Interface

• Analog

• Digital– Parallel or Serial Interface

• Analog

From Sharp Electronics:Many ranges and two interface types:

From Sharp Electronics:Many ranges and two interface types:

Distance Sensors- infrared -

Distance Sensors- infrared -

• Maximum range is 130 cm for the sensor with the analog interface

• Inaccurate measurements above 80 cm.

• Fragile devices not meant for industrial quality.

• Digital sensors did not respond to datasheet specifications and could not be used

• Analog sensors were properly interfaced

• Maximum range is 130 cm for the sensor with the analog interface

• Inaccurate measurements above 80 cm.

• Fragile devices not meant for industrial quality.

• Digital sensors did not respond to datasheet specifications and could not be used

• Analog sensors were properly interfaced

Distance Sensors- Ultrasound -

Distance Sensors- Ultrasound -

From Devantech:Acquired one device from a family of three:

From Devantech:Acquired one device from a family of three:

• SRF-08 Range Finder:– Standard two wire I2C

Interface– Senses Objects up to 6 meters– 15 mA current max

• SRF-08 Range Finder:– Standard two wire I2C

Interface– Senses Objects up to 6 meters– 15 mA current max

Distance Sensors- Summary -

Distance Sensors- Summary -

• Ultrasound SRF-08 sensor was used in the prototype– Advantages

• Robust, reliable product• Large range

– Disatvantages• Price (around $40)• Marketing ultrasound in pet environments

• Infrared Sensors– Advantages:

• Price ($5 to $15)– Disatvantages

• Fixed distance measuring (On/Off)• Unreliable

• Ultrasound SRF-08 sensor was used in the prototype– Advantages

• Robust, reliable product• Large range

– Disatvantages• Price (around $40)• Marketing ultrasound in pet environments

• Infrared Sensors– Advantages:

• Price ($5 to $15)– Disatvantages

• Fixed distance measuring (On/Off)• Unreliable

On/Off SwitchOn/Off Switch

Either a:• Relay• Transistor (MOSFET)

Used a Relay for simplicity of interfacing

Either a:• Relay• Transistor (MOSFET)

Used a Relay for simplicity of interfacing

MicrocontrollerMicrocontroller

Rabbit Semiconductor Ltd.:Offers a wide range of Microcontroller cores:

Rabbit Semiconductor Ltd.:Offers a wide range of Microcontroller cores:

Acquired the RCM 3700Acquired the RCM 3700

MicrocontrollerMicrocontroller

• 512K SRAM• 512K Flash• Ethernet for Networked Applications

including web-enabled embedded apps.

• Many standard interfaces:– USART, SPI, I2C, SCI, Parallel Ports

• Many Timers for clock generation and PWM

• Provided Development Environment • Standard ANSI-C language

programming environment• Many libraries spanning as wide as:

– PWM, SPI, USART, GPS, Timer Control, TCP/IP, etc …

• 512K SRAM• 512K Flash• Ethernet for Networked Applications

including web-enabled embedded apps.

• Many standard interfaces:– USART, SPI, I2C, SCI, Parallel Ports

• Many Timers for clock generation and PWM

• Provided Development Environment • Standard ANSI-C language

programming environment• Many libraries spanning as wide as:

– PWM, SPI, USART, GPS, Timer Control, TCP/IP, etc …

RCM 3700 featuresRCM 3700 features

ImplementationImplementationA PCB board was designed and fabricated .PCB Schematic below:

A PCB board was designed and fabricated .PCB Schematic below:

7805D1

C2C1C3

R1 R2

LED1

T1

Relay 1

Ra

bbi

t Int

erf

ace

+5VGND

SCLSDA

RCLC

+5VGND

SCLSDA

SR

F0

8 Int

erf

ace

Ant

enn

a Inp

ut Ant

enn

a Out

put

Problems and IssuesProblems and Issues

• Space problem• Test and Lab Equipment Shortage• Dong Jr. was a Great help. No Technician

support after he left• Component acquisition problem• Reimbursement turnaround time• Student lack of interest• Lack of publicity for the program

– Suggestion: Creation of web page for the innovation projects

• Space problem• Test and Lab Equipment Shortage• Dong Jr. was a Great help. No Technician

support after he left• Component acquisition problem• Reimbursement turnaround time• Student lack of interest• Lack of publicity for the program

– Suggestion: Creation of web page for the innovation projects

CompetitionCompetitionTaiwanese Company has designed a similar product

and is shipping it (link below). Chinese Patent PendingTaiwanese Company has designed a similar product

and is shipping it (link below). Chinese Patent Pending

Proves that we are on the RIGHT TRACKProves that we are on the RIGHT TRACK

http://tech.monstersandcritics.com/news/article_1075388.php/Taiwan_firm_invents_gadget_to_stop_kids_from_sitting_too_close_to_TV

http://tech.monstersandcritics.com/news/article_1075388.php/Taiwan_firm_invents_gadget_to_stop_kids_from_sitting_too_close_to_TV

PerspectivePerspective

• Cost reduce the product further– Replace Rabbit core by PIC microcontroller

or similar cost microcontroller• Add keypad and display for

programming sensor cut-off distance• Using a High-Frequency MOSFET as

switch.• Competition proposed price is $450• Our Cost can be reduced to around $70

• Cost reduce the product further– Replace Rabbit core by PIC microcontroller

or similar cost microcontroller• Add keypad and display for

programming sensor cut-off distance• Using a High-Frequency MOSFET as

switch.• Competition proposed price is $450• Our Cost can be reduced to around $70