tv watching safety distance enforcer dr. abdelhafid bouhraoua mr. kamel chenaoua dr. abdelhafid...
TRANSCRIPT
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