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

Outline 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 Project To provide a way that prevent children from watching TV from a close distance to safeguard their eyes health

Principle of Operation From ANT To TV 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 How Does it Work

Components 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 - 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 - 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 - 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 - 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 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

Microcontroller Rabbit Semiconductor Ltd.: Offers a wide range of Microcontroller cores: Rabbit Semiconductor Ltd.: Offers a wide range of Microcontroller cores: Acquired the RCM 3700

Microcontroller 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 features

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

Problems 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

Competition Taiwanese Company has designed a similar product and is shipping it (link below). Chinese Patent Pending Proves that we are on the RIGHT TRACK article_ php/Taiwan_firm_invents _gadget_to_stop_kids_from_sitting_too_cl ose_to_TV article_ php/Taiwan_firm_invents _gadget_to_stop_kids_from_sitting_too_cl ose_to_TV

Perspective 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