1 / 24

Stop & Go Driving System

Stop & Go Driving System. Group 16 Will Allen & Silpa Nannapaneni ECE 445 Senior Design November 30, 2006. Introduction. Stop & Go Driving System is an adaptive cruise control system that maintains a safe driving distance from the vehicle ahead Our system is modeled using R/C cars

avi
Download Presentation

Stop & Go Driving System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Stop & Go Driving System Group 16 Will Allen & Silpa Nannapaneni ECE 445 Senior Design November 30, 2006

  2. Introduction • Stop & Go Driving System is an adaptive cruise control system that maintains a safe driving distance from the vehicle ahead • Our system is modeled using R/C cars • System is designed for low speed applications

  3. Benefits • System would allow the driver to do something else while in stop & go traffic • Could prevent accidents • Reduces reaction time • Implementation of system could improve traffic flow

  4. Features • Infrared proximity sensor measures 20-150 cm • Reflective object sensor measures the speed of the car • Speed is displayed on LCD • Microcontroller will automatically adjust the speed of the car to maintain a safe driving distance

  5. Stop & Go Driving System

  6. System Overview

  7. Sensor Overview • Speed Sensor • Reflective object sensor detects white strip on the tire and sends output to microcontrollers. • Proximity Sensor • Sharp GP2Y0A02YK infrared proximity sensor • Range of 20 to 150 cm

  8. Proximity Sensor Output • Measured output of proximity sensor for distances ranging from 10 to 185 cm • Output becomes inconsistent for distances > 150 cm

  9. Microcontroller Overview • Motor Microcontroller • PIC16F877A microcontroller receives analog inputs from speed sensor and proximity sensor • Measures period between pulses from speed sensor input • Calculates speed = 2πR / period • R = Tire radius for the R/C car = 3.5 cm • PIC calculates safe driving distance based on sensor inputs

  10. ADC Values for Proximity Sensor • Measured output of PIC analog to digital converter values for various voltages • Correlated ADC values to corresponding distances from proximity sensor

  11. Speed Detection Ch. 1: Speed pulse waveformCh. 2: PIC measurement of periods

  12. Stopping Distance Test Results

  13. Following Distance Calculation Stopping Distance (m) = 0.5435*Speed (m/s) + 0.2786 Following Distance (m) = Stopping Distance (m) + 0.15

  14. Motor Microcontroller Flowchart

  15. Motor Control Pulses Neutral  1.4ms Pulse Forward  > 1.4ms Pulse Reverse  < 1.4ms Pulse

  16. Microcontroller Overview • Display Microcontroller • PIC16F877A microcontroller receives input from speed sensor • Measures period between pulses • Speed = 2πR / period • R = Tire radius for the R/C car = 3.5 cm • Outputs speed to speedometer

  17. Stop & Go Driving System (Schematic)

  18. Power Supply • Two 7.2V 600mAh R/C car batteries • One battery powers circuit components • Max current for our circuit is 80 mA • Second battery powers R/C car motor • Toggle switch turns system on • 5V voltage regulator added to second car to improve control

  19. Successes • Proximity sensor was very accurate • Within 3 cm of actual distance • Motor control • Adjustment of acceleration • Speed calculation for Motor Microcontroller • Period measurement was only off by 5ms

  20. Challenges • Extreme sensitivity of speed sensor • Speedometer was inaccurate during acceleration and would not display at times • Analog multiplexer would not allow communication of receiver with our system

  21. Recommendations • Usage of multiple proximity sensors could reduce system failures • Addition of analog multiplexer • Analog speedometer instead of using LCD

  22. Ethical Issues • Reliability of range finding sensors • Usage of the system could decrease driver’s focus

  23. Questions??

  24. Thank You

More Related