NASCAR Proximity Detector Group Y2 C. J. Chance Allen Edwards Keenan Gills Michael Torrance Devantech SRF04 Ranger Applications Robotics with proximity needs Vehicle Reversal Detection System Any system needing accurate range information Proposed System NASCAR Proximity Sensor System Detect distance to other vehicles Detects in front, side, and rear of vehicle Implements Ultrasonic Ranger to determine distance Similar Products Vehicle Parking Sensors Back-up sensor Sonar detection devices Advantages Improve safety Data collection “scouting report” Increase entertainment Make racing better Help student drivers System Diagram Devantech SRF04 Ranger Processor Wireless Transmitter Wireless Receiver Driver’s Display Data Collection Device Sensor Placement Right Side Front Rear Left Side Sensor Dimensions Housing Diagram Sensor Physics Sensor will create a pulse of sound with a frequency of 40 kHz Senor will listen for a reflection or echo and from it calculate the distance The longer the interval between producing the sound wave and the return of the echo the farther away the is car Sensor Physics Sensor Physics Sound waves in air are called compression waves or longitudinal waves Sound waves can have different wavelengths, amplitudes, velocity, and frequencies Frequency – number of times it oscillates in a second past a fixed point Frequency is measured in Hertz (Hz) Sensor Physics Velocity = wavelength / period V=λ/T Period = 1 / frequency T=1/f Sensor Physics Sensor Physics Sound waves in the air Compression wave looks like a slinky Displacement in the air is parallel to the propagation of the wave Specifications Voltage Current Frequency Maximum Range Minimum Range Sensitivity Input Trigger Echo Pulse Weight Size 5v 30mA Typ. 50mA Max 40KHz 3m 3 cm Detect a 3cm diameter stick at > 2 m 10uS Min. TTL level pulse Positive TTL level signal, width proportional to range. 0.4 oz. 1.75" w x 0.625" h x 0.5" d Beam Spread Timing Diagram Basic Schematic Proposed Uses NASCAR: For analysis of performance of car with relation to opponent's Enhance Safety Increase entertainment Driver Education To help new drivers be more aware of the surroundings Benefit-Cost Analysis (1) Sensor Protective Casing LED Display Wireless Communication Device Control Unit Software Total Per Car $25.00 Per Sensor $300.00 Per System $50.00 Per Case $600.00 Per System $50.00 Per System $80.00 Per System $10.00 Per System $50.00 Per System $1090.00 Per System Benefit-Cost Analysis (2) With the opportunity of expanding into enhanced entertainment in the private home, there is no limit on the benefit of the system. Could receive corporate sponsorship for the system and sell the distribution of analysis to a corporation to then redistribute to the public. Sell the system to government for use in educational programs. NASCAR Proximity Detector Questions?