//ULTRASONIC SENSOR
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16,2);

int echo = 12;
int trig = 13;
int duration = 0;
int distanceCm = 0;
int distanceInches = 0;
int ledr = 8;
int ledg = 7;
int ledb = 9;
int buzzer = 4;

void setup() {  
  // put your setup code here, to run once:
  //int led = 13;
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  Serial.begin(9600);

  lcd.init();
  lcd.backlight();

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(trig,LOW);
  delayMicroseconds(50);
  digitalWrite(trig, HIGH);
  delayMicroseconds(50);
  digitalWrite(trig, LOW);
  duration = pulseIn(echo,HIGH);
  distanceCm = duration/29/2;
  distanceInches = duration/74/2;
  int randnum = random(300);
  Serial.println("Distance:");
  Serial.print(distanceCm);
  Serial.print(" Cm & ");
  Serial.print(distanceInches);
  Serial.println(" Inches");
  Serial.print("randnum: ");
  Serial.println(randnum);
  delay(500);

  if(randnum < 50){
    digitalWrite(ledr, HIGH);
    
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Distance: ");
    lcd.print(distanceCm);
    lcd.print(" Cm");
    lcd.setCursor(1,1);
    lcd.print("rnum: ");
    lcd.print(randnum);
    lcd.print(": Red");

    delay(1000);
    digitalWrite(ledr, LOW);
    delay(1000);

  }
  else if(randnum > 50 && randnum < 200){
    digitalWrite(ledg, HIGH);
    
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Distance: ");
    lcd.print(distanceCm);
    lcd.print(" Cm");
    lcd.setCursor(1,1);
    lcd.print("rnum: ");
    lcd.print(randnum);
    lcd.print(": Green");

    delay(1000);
    digitalWrite(ledg, LOW);
    delay(1000);

  }
  else{
    digitalWrite(9, HIGH);
    digitalWrite(buzzer, HIGH);
    
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Distance: ");
    lcd.print(distanceCm);
    lcd.print(" Cm");
    lcd.setCursor(1,1);
    lcd.print("rnum: ");
    lcd.print(randnum);
    lcd.print(": Blue");

    delay(1000);
    digitalWrite(9, LOW);
    digitalWrite(buzzer, LOW);
    delay(1000);
  }

}