Automation and Control of a limited size parking lot using PIC18 Microcontroller Alaa Sharif Ali Ghamlouch Zaher Khattab April 2011 Presented to: Dr. Youmin Zhang

Contents Introduction The Hardware Circuit Diagram Flow Chart Sensing and Interrupts Actuation Feedback and Display Conclusion Future Work

Introduction The objective of the project is to count number of cars entering and exiting the parking lot Number of available lots is displayed on an LCD Automation components used: Sensors, Servo Motors, LCD display, indicator LEDs components are connected to microcontroller (PIC18F4431) to simulate the sensing, actuating, and feedback

The Hardware PIC18F4431 Microcontrollers 2 Sensors, each sensor consist of a IR transmitter & 40 KHz receiver 555 timer 2 Electric Servo motors (HiTEC HS-422) LCD Display (2 Lines, Max 16 character in each line) 4 indicating LEDs (2 Green, 2 Red)

Circuit Diagram

Flow Chart

Sensing Introducing IR emitter-receiver sensor Implementation of the IR emitter-receiver sensor using 555 timer

Sensing

Actuation 2 servo motors controlling the opening and closing of gates Generating delays to turn the motor(loop repetition)

Actuation On and off delay defines duty cycle, period and frequency Neutral: 1.5 ms high, 18.5 ms low Rotation : 1.9 ms high, 18.1 ms low Maintaining the position of the motor

Feedback and Display Interrupt through sensors Incrementing / decrementing a register to count available lots Displaying available lots on LCD Indicator LEDs to indicate opening and closing of gates

Conclusion Combination between hardware and software was achieved with success Fulfilling the interface between the IR emitter receiver sensor, the 2 servo motors, the LCD and the four indicator LEDs

Future Work Use of vision system to indicate presence of cars on gate Fully automated vision system indicating number of available slots and controlling the gates Use of IR sensors on all parking slots to indicate a vacant one, and displaying slots number on LCD

Thank You