#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

String word1;
String word2;
bool splash;
int total_kendaraan_masuk;
int total_kendaraan_keluar;

const float GAMMA = 0.7;
const float RL10 = 50;

#define ECHO_PIN_MASUK 3
#define TRIG_PIN_MASUK 4
#define ECHO_PIN_KELUAR 11
#define TRIG_PIN_KELUAR 12

float readDistanceCM(int TRIG_PIN, int ECHO_PIN) {
  pinMode(TRIG_PIN, OUTPUT);  // Clear the trigger
	digitalWrite(TRIG_PIN, LOW);
	delayMicroseconds(2);
	digitalWrite(TRIG_PIN, HIGH);
	delayMicroseconds(10);
	digitalWrite(TRIG_PIN, LOW);
	pinMode(ECHO_PIN, INPUT);
	return pulseIn(ECHO_PIN, HIGH);
}

void setup() {
  lcd.init();                      
  lcd.backlight();
  lcd.clear();
  word1 = "Selamat datang";
  word2 = "   di ITTS    ";
  splash=true;

}

void loop() {
  if (splash){
    lcd.clear();
    lcd.setCursor(3, 1);
    lcd.print(word1);
    lcd.setCursor(3, 2);
    lcd.print(word2);
    delay(1500);
    lcd.clear();
    splash=false;

  } else{

    int analogValue = analogRead(A0);
    float voltage = analogValue / 1024. * 5;
    float resistance = 2000 * voltage / (1 - voltage /5);
    float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1/GAMMA));

    if (lux > 100){
      // Siang
      lcd.setCursor(0, 0);
      lcd.print("Saat ini Siang hari");
      float jarak_masuk = readDistanceCM(TRIG_PIN_MASUK, ECHO_PIN_MASUK);

      if (jarak_masuk/58 < 100.0){
        total_kendaraan_masuk++;
        delay(250);
        lcd.setCursor(0, 2);
        lcd.print("Kendaraan Masuk: ");
        lcd.print(total_kendaraan_masuk);
      }

    }
    else{
      // Malam
      lcd.setCursor(0, 0);
      lcd.print("Saat ini Malam hari");
    }

    float jarak_keluar = readDistanceCM(TRIG_PIN_KELUAR, ECHO_PIN_KELUAR);

    if (jarak_keluar/58 < 100.0){
      total_kendaraan_keluar++;
      delay(250);
      lcd.setCursor(0, 3);
      lcd.print("Kendaraan Keluar: ");
      lcd.print(total_kendaraan_keluar);
    }
  }
}