#include<LiquidCrystal.h>
 #define trigerPin 8
  #define echoPin 9
  #define ledPin 2
  #define speakerPin 10
  #define pitch 262
  double duration, distance;
LiquidCrystal lcd(12, 11, 4, 5, 6, 7);
  void setup() {
    // put your setup code here, to run once:

  lcd.begin(16,2);
  lcd.setCursor(0,0); 
  pinMode(trigerPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(speakerPin, OUTPUT);

  }

  void loop() {

    // put your main code here, to run repeatedly:
    digitalWrite(trigerPin, LOW);
    delayMicroseconds(2);
    digitalWrite(trigerPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigerPin, LOW);
    delayMicroseconds(2);

    duration =pulseIn(echoPin,HIGH);

    distance=(duration/2)*0.0343;

lcd.setCursor(0,1); //set the cursor to column 0 and line 1
lcd.print(distance);
lcd.print("cm");
delay(100);

    if (distance < 200) {
     lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("High Risk");
      digitalWrite(ledPin, HIGH);
      tone(speakerPin,pitch);
      delay(300);
      digitalWrite(ledPin, LOW);
  noTone(speakerPin);
  delay(300);
    }
    else {
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("No Risk");
      digitalWrite(ledPin, LOW);
  noTone(speakerPin);

    }

  }