#include <LiquidCrystal.h>               //Using the Arduino as the controller device, the library Allows communication with liquid crystal displays (LCDs).
LiquidCrystal lcd(A0,A1,A2,A3,A4,A5);    // initialize the library by associating any needed LCD interface pin with arduino uno 

int i = 0;                               //interger i is defined to store the value of buttons 
int j;                                   //interger j is defined to store the value of buttons 
int h;                                   //interger h is defined to store the value of buttons 
int b1 = 5;                              //button1 pin connecetd to pin 5 of Arduino UNO
int b2 = 6;                              //button1 pin connecetd to pin 6 of Arduino UNO
int b3 = 4;                              //button1 pin connecetd to pin 4 of Arduino UNO
int b4 = 3;                              //button1 pin connecetd to pin 3 of Arduino UNO
int b5 = 2;                              //button1 pin connecetd to pin 2 of Arduino UNO
const int trigPin = 9;                   // attach pin 9 Arduino to pin trig of HC-SR04
const int echoPin = 10;                  // attach pin 10 Arduino to pin echo of HC-SR04
// defines variables
long duration;                           // variable for the duration of sound wave travel
int distance;                            // variable for the distance measurement


void setup() {
  pinMode( b1 , INPUT_PULLUP);           //Set button1 as INPUT device
  pinMode( b2 , INPUT_PULLUP);           //Set button2 as INPUT device
  pinMode( b3 , INPUT_PULLUP);           //Set button3 as INPUT device
  pinMode( b4 , INPUT_PULLUP);           //Set button4 as INPUT device
  pinMode( b5 , INPUT_PULLUP);           //Set button5 as INPUT device
  pinMode(trigPin,OUTPUT);               // Sets the trigPin as an OUTPUT
  pinMode(echoPin,INPUT);                // Sets the echoPin as an INPUT
  lcd.begin(16,2);                       // set up the LCD's number of columns and rows:
  lcd.setCursor(0,0);                    // to display the values on to the top left of LCD 
  lcd.print("Speed:");                   // print the value on LCD
}


void loop() {
int v1 = digitalRead(b1);               //Reads the value from a button1 and store the value in V1 
int v2 = digitalRead(b2);               //Reads the value from a button2 and store the value in V1
int v3 = digitalRead(b3);               //Reads the value from a button3 and store the value in V1
int v4 = digitalRead(b4);               //Reads the value from a button4 and store the value in V1
int v5 = digitalRead(b5);               //Reads the value from a button5 and store the value in V1

if (( v1 == LOW)&&(v2 == HIGH)&&(v3== HIGH)&&(v4==HIGH)&&(v5 == HIGH))
{
   j = (i += (1 - (i >= 150)));          //incrementing the i value   
  
  lcd.setCursor(0,0);
  lcd.print("Speed:");
  lcd.setCursor(0,1);
  delay(500);
  lcd.println(i);
  
};
if((v1 == HIGH)&&(v2 == LOW)&&(v3 == HIGH)&&(v4==HIGH)&&(v5 == HIGH)){

  i--;                                  // decremenying the value of i 
  lcd.setCursor(0,0);
  lcd.print("Speed:");
  delay(500);
  lcd.setCursor(0,1);
  lcd.print(i);
  
 }
 if ((v1 == HIGH)&&(v2 == HIGH)&&(v3== LOW)&&(v4==HIGH)&&(v5 == HIGH)){

  lcd.setCursor(0,0);
  lcd.print("Speed:");
  lcd.setCursor(0,1);
  delay(500);
  lcd.print(i);
  delay(1000);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Speed");
  delay(500);
 }

 if ((v1 == HIGH)&&(v2 == HIGH)&&(v3==HIGH)&&(v4==LOW)&&(v5 == HIGH)){
   lcd.setCursor(0,0);
   lcd.print("Speed:");
   lcd.setCursor(0,1);
   delay(1000);
   lcd.println(0);
  

  }
 if ((v1 == HIGH)&&(v2 == HIGH)&&(v3==HIGH)&&(v4== HIGH)&&(v5 == LOW)){
 
  digitalWrite(trigPin, LOW);                    // Clears the trigPin condition
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);                   // Sets the trigPin HIGH (ACTIVE) for 10 microseconds
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);                    // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);             //calculating time 
  distance= duration*0.034/2;                    // calculating distance 

  if(distance >20){                               // applying condition 
    i--;
    delay(1000);
    lcd.setCursor(0,0);
    lcd.print("Speed:");
    lcd.setCursor(0,1);
    lcd.print(i);
  }
 }

}