#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
#define buzzer 7
#define R 4
#define G 5
#define B 6
#define trig 2
#define echo 3
int duration;
int cm;
void setup() {
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  lcd.init();
  lcd.print("juckrapat");
}
void distance(){
  digitalWrite(trig,HIGH);
  delay(100);
  digitalWrite(trig,LOW);
  duration=pulseIn(echo,HIGH);
  cm=duration/58;
  lcd.setCursor(0,1);
  if(cm<100){
    lcd.print("distance : ");
    lcd.print(cm);
    lcd.print("  ");
  }else{
    lcd.print("distance : ");
    lcd.print(cm);
  }
  if(cm>100){
    green();
  }

  if(cm<299 && cm>101){
    delay(100);
    yellow();
  }

  if(cm<100 && cm>1){
    red();
    delay(100);
    cyan();
    tone (7,999,1000);
  }
}
void red(){
  digitalWrite(B,LOW);
  digitalWrite(R,HIGH);
  digitalWrite(G,LOW); 
}
void green(){
  digitalWrite(B,LOW);
  digitalWrite(R,LOW);
  digitalWrite(G,HIGH); 
}
void nik(){
  digitalWrite(B,LOW);
  digitalWrite(R,LOW);
  digitalWrite(G,LOW); 
}
void yellow(){
  digitalWrite(B,LOW);
  digitalWrite(R,HIGH);
  digitalWrite(G,HIGH); 
}
void cyan(){
  digitalWrite(R,LOW);
  digitalWrite(B,HIGH);
  digitalWrite(G,LOW);
}
void purple() {
  digitalWrite(G,LOW);
  digitalWrite(B,HIGH);
  digitalWrite(R,HIGH);
}
void white() {
  digitalWrite(G,HIGH);
  digitalWrite(B,HIGH);
  digitalWrite(R,HIGH);
}

void loop() {
  distance();

}