#define PIN_TRIG 12//
#define PIN_ECHO 11//
int ledmerah =8;
int ledkuning =7;
// Jika jarak < 100 maka hidup lampu merah
// Jika jarak < 200 maka hidup lampu kuning
// Jika jarak > 201 maka hidup semuanya
#include <LiquidCrystal_I2C.h>//
const int buttonPin = 2;
float cm;

float temp;
LiquidCrystal_I2C lcd(0x27, 20, 4);
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
  lcd.init();
  lcd.backlight();
  pinMode(buttonPin, INPUT_PULLUP);
}

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

  temp = float(pulseIn(PIN_ECHO, HIGH));


  cm = (temp * 17 )/1000;
  Serial.print("Echo = ");
  Serial.print(temp);
  Serial.print(", Distance = ");
  Serial.print(cm);
  Serial.println("cm");
  delay(300);
  lcd.setCursor(1, 0);
  lcd.print("Echo=");
  lcd.print(temp);
  lcd.setCursor(1, 1);
  lcd.print("Distance=");
  lcd.print(cm);

  if(cm <=100){
    digitalWrite(ledmerah, HIGH);
  }
else  if(cm >100 && cm <=200)
 {
  digitalWrite(ledkuning, HIGH);
   digitalWrite(ledmerah, LOW);

  }
  else {
    digitalWrite(ledmerah, HIGH);
    // delay(500);
    // digitalWrite(ledmerah, LOW);
    digitalWrite(ledkuning, HIGH);
    // delay(500);
    // digitalWrite(ledkuning, LOW);
  }
 
  
   if (!digitalRead(buttonPin)) 
    delay(50);
    if (!digitalRead(buttonPin)) {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("button Pressed");


    }
    
    

   }