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/*Arduino parking lot(version 2)
YouTube/Tech Build
Code used in the production of the Youtube material.
*/

#include <Servo.h>
#include<LiquidCrystal.h>
LiquidCrystal lcd(12,11,5,4,3,2);//connected to RS,EN,D4,D5,D6,D7 of LCD display respectively
Servo myservo;  // create servo object to control a servo

#define ServoM    7        //Connected to the servo motor.
#define Exit      9         //Pin connected to the EXIT sensor.
#define In        8         //Pin connected to the IN sensor.
#define Pwr  6              //Extra power pin for sensors(Don't connect servo's power to this!)
#define Gnd  10             //Extra groung pin for sensors(Don't connect servo's power to this!)
#define BarLow    90      //Low position of the barrier.
#define BarUp     177        //Up position of the barrier.
#define CAPACITY  7         //Capacity of the parking lot.






void setup(){
  myservo.attach(ServoM);          // attaches the servo.
  lcd.begin(16,2);
  lcd.print("Space left for");
  pinMode(Gnd, OUTPUT);
  pinMode(Pwr, OUTPUT);
  pinMode(Exit, INPUT);           // set "EXIT" sensor pin to input
  pinMode(In, INPUT);             // set "IN" sensor pin to input
  digitalWrite(Gnd, LOW);
  digitalWrite(Pwr, HIGH);
  myservo.write(BarLow);          //Barrier in the low position
//  delay(1000);
}

int  Available= 7 ;                    // Number of places available.

//================================================================
void loop(){
if (Available == 1){ //If only one place is available.
  lcd.clear();       //Clear the LCD screen.
lcd.setCursor(1,0);
lcd.print("Wolne miejsca:");//Display the text"Space left for.
lcd.setCursor(0,1);
lcd.print(Available);       //Display the no. of spaces left for cars.
lcd.print(" aut");
}else{
if (Available >= 1){
lcd.clear();
lcd.setCursor(1,0);
lcd.print("Wolne miejsca:");
lcd.setCursor(0,1);
lcd.print(Available);
lcd.print(" aut ");
}else{
  lcd.clear();
    lcd.setCursor(1,0);
    lcd.print("Sorry!");
    lcd.setCursor(0,1);
    lcd.print("Brak Miejsc!");
}
}


if(digitalRead(In)==1)     //If the IN sensor detects a car at the entrance.
{
  if(Available != 0){     //Checking if there is place in parking lot('!=' means 'not equal to').
    Available--;          //Deduct a place from the lot in the memory.
    myservo.write(BarUp); //Lift the barrier up.
    delay(3000);          //Wait for 3 seconds to let the car pass.
    myservo.write(BarLow);//Lower the barrier.
    }
  }
if(digitalRead(Exit)==1)     //If the EXIT sensor detects a car the exit.=
{
  if(Available != CAPACITY){
    Available++;
    myservo.write(BarUp);
    delay(3000);
    myservo.write(BarLow);
    }
}
  delay(20);
}