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TV Watching Safety Distance Enforcer
TV Watching Safety Distance Enforcer
Dr. Abdelhafid BouhraouaMr. Kamel Chenaoua
Dr. Abdelhafid BouhraouaMr. Kamel Chenaoua
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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
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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
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Principle of OperationPrinciple of Operation
From ANT
To TV
Distance Monitoring Device
Distance Monitoring Device
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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
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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
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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:
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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