#include <LiquidCrystal_I2C.h>

#define LDR_PIN 4
#define ECHO_PIN 14 
#define TRIG_PIN 12 

LiquidCrystal_I2C lcd(0x27,16,2);

byte Heart[] = { B00000,
  B01010,
  B01110,
  B00100,
  B10101,
  B10101,
  B01110,
  B00100 }; 

void setup()  
{   
  pinMode(LDR_PIN, INPUT);   
  pinMode(TRIG_PIN, OUTPUT);   
  pinMode(ECHO_PIN, INPUT);   
  Serial.begin(115200);
  pinMode(2, OUTPUT);   pinMode(13, INPUT_PULLUP);     Serial.begin(115200); 
 
  // setup LCD--
     lcd.init();   
     lcd.clear();          
     lcd.backlight();   
     // membuat karakter baru   
   
     // menampilkan karakter   
     
    
  // put your setup code here, to run once:
  pinMode(2, OUTPUT);
  pinMode(13, INPUT_PULLUP);
  Serial.begin(115200);
  Serial.println("Hello, ESP32!"); 
  } 
 
void loop()  
{ // Clear the condition   
      digitalWrite(TRIG_PIN, LOW);   
      delayMicroseconds(2);   
      // Generate ultrasonic signal   
      digitalWrite(TRIG_PIN, HIGH);   
      delayMicroseconds(10);   
      digitalWrite(TRIG_PIN, LOW);   
      // Read ultrasonic signal   
      int duration = pulseIn(ECHO_PIN, HIGH);   
      // Calculating the distance   
      float distance = duration * 0.034 / 2;     
      Serial.print("Jarak: ");   
      Serial.print(distance);  
      Serial.println(" CM");      
      Serial.println();   
      delay(1000);   

  Serial.print("Cahaya: ");   
  lcd.setCursor(0,0);
  if (digitalRead(LDR_PIN) == LOW) {     
    Serial.println("Terang");
    
    lcd.print("Terang"); 
    lcd.print("jarak : ")  ;
    lcd.print(distance);
    } else {     
      Serial.println("Gelap");   
      lcd.print("Gelap");
      lcd.print("jarak : " );
      lcd.print(distance);
      }      
      }