Talha Naeem / Mbed 2 deprecated car_parking_system

This car parking system uses Freedom board KL25, ultrasonic sensor, keypad, and LCD. The distance is measured via ultrasonic sensor, and it is displayed on LCD. The keypad takes user input of the that decides what led to turn on. If user types 25, after 25 cm, the light of the Freedom board turns to a specific color. After half if this distance 12.5 cm, it starts to to turn yellow. And after 90% of distance is covered then it starts blinking.

Dependencies:   HC_SR04_Ultrasonic_Library Keypad TextLCD mbed

main.cpp

Committer:
tb_17
Date:
20 months ago
Revision:
0:0999baad59eb

File content as of revision 0:0999baad59eb:

#include "mbed.h"
#include "TextLCD.h"
#include "Keypad.h"
#include "ultrasonic.h"

TextLCD my_lcd(PTE20, PTE21, PTE22, PTE23, PTE29, PTE30, TextLCD::LCD16x2);
Keypad kpad(PTA12, PTD4, PTA2, PTA1, PTC9, PTC8, PTA5, PTA4);
 
 void dist(int distance){
}
 
ultrasonic mu(PTA13, PTD5, .1, 1, &dist);    //Set the trigger pin to PTA13 and the echo pin to PTD5
                                        //have updates every .1 seconds and a timeout after 1
                                        //second, and call dist when the distance changes
float dispDist;
float prevDist;
float interDist;
float input;

PwmOut ledRed(LED_RED);
PwmOut ledGreen(LED_GREEN);
PwmOut ledBlue(LED_BLUE);

int main()
{
    my_lcd.printf("Input distance (cm) then press #:");
    wait(2);
    my_lcd.cls();
    char key;
    int released = 1;
    char inputArray[16];
    int i = 0 ;
    while(i<16){
        key = kpad.ReadKey();                   //read the current key pressed

        if(key == '\0')
            released = 1;                       //set the flag when all keys are released
           
        if((key != '\0') && (released == 1)) {  //if a key is pressed AND previous key was released
            
            if (key == '#'){
                my_lcd.printf("=");
                break;
            }
            else{
                my_lcd.printf("%c", key);
            }
            
            inputArray[i] = key; 
            i++;         
            released = 0;                       //clear the flag to indicate that key is still pressed
        }
    }
    sscanf(inputArray, "%f", &input);
    my_lcd.locate(0, 1);
    my_lcd.printf("Input: %.1f", input);
    wait(1);
    my_lcd.cls();
    
    mu.startUpdates();//start mesuring the distance
    while(1)
    {        
        dispDist = mu.getCurrentDistance();
        dispDist = dispDist / 10;
        interDist = ((2 * input) / 3 - input / 3) / 5;
        if (dispDist > input){
            PwmOut extRedLed(PTD2);
            PwmOut extGreenLed(PTD0);
            extRedLed = 0;
            extGreenLed = 0;
            wait(0.01);
        }
        
        else if ((dispDist < input && dispDist > 2 * input / 3)){
            PwmOut extRedLed(PTD2);
            PwmOut extGreenLed(PTD0);;
            extRedLed = 0;
            extGreenLed = 1;
            wait(0.01);
        }
        
        else if (dispDist >= input / 3 & dispDist <= (input / 3) + interDist){
            //Do something
            PwmOut extRedLed(PTD2);
            PwmOut extGreenLed(PTD0);
            extRedLed = 0.95;
            extGreenLed = 0;
            wait(0.01);
        }
        else if (dispDist >= (input / 3) + interDist &  dispDist <=  (input / 3) + 2 * interDist){
            //Do something
            PwmOut extRedLed(PTD2);
            PwmOut extGreenLed(PTD0);
            extRedLed = 0.75;
            extGreenLed = 0;
            wait(0.01);
        }
        else if (dispDist >= (input / 3) + 2 * interDist &  dispDist <=  (input / 3) + 3 * interDist){
            //Do something
            PwmOut extRedLed(PTD2);
            PwmOut extGreenLed(PTD0);
            extRedLed = 0.55;
            extGreenLed = 0;
            wait(0.01);
        }
        else if (dispDist >= (input / 3) + 3 * interDist &  dispDist <=  (input / 3) + 4 * interDist){
            //Do something
            PwmOut extRedLed(PTD2);
            PwmOut extGreenLed(PTD0);
            extRedLed = 0.35;
            extGreenLed = 0;
            wait(0.01);
        }
        else if (dispDist >= (input / 3) + 4 * interDist &  dispDist <=  (input / 3) + 5 * interDist){
            //Do something
            PwmOut extRedLed(PTD2);
            PwmOut extGreenLed(PTD0);
            extRedLed = 0.15;
            extGreenLed = 0;
            wait(0.01);
        }
        else if (dispDist < (input / 3)){
                PwmOut extRedLed(PTD2);
                PwmOut extGreenLed(PTD0);
                extRedLed = 0.95;
                extGreenLed = 0;
                wait(0.01);
            }
        
        if (prevDist > dispDist){
            ledRed = 0;
            ledGreen = 0;
            ledBlue = 1;
            wait(0.01);
        }
        
        else if (prevDist < dispDist){
            ledRed = 1;
            ledGreen = 1;
            ledBlue = 0;            
            wait(0.01);
        }
        
        else{
            ledRed.pulsewidth(1);
            ledGreen.pulsewidth(1);
            ledBlue.pulsewidth(1); 
            wait(0.01);
        }
        
        prevDist = dispDist;
        my_lcd.printf("%.1f", dispDist); 
        my_lcd.locate(6, 0);
        my_lcd.printf("cm");
        wait(0.5);
        my_lcd.cls();
        wait(0.01);
    }
}