#include <LiquidCrystal.h>

#define TRIGGER_PIN1 2
#define ECHO_PIN1 3
#define TRIGGER_PIN2 4
#define ECHO_PIN2 5

#define OUTPUT_PIN1 6
#define OUTPUT_PIN2 7

LiquidCrystal lcd(8, 9, 10, 11, 12, 13);

void setup() {
  pinMode(TRIGGER_PIN1, OUTPUT);
  pinMode(ECHO_PIN1, INPUT);
  pinMode(TRIGGER_PIN2, OUTPUT);
  pinMode(ECHO_PIN2, INPUT);
  
  pinMode(OUTPUT_PIN1, OUTPUT);
  pinMode(OUTPUT_PIN2, OUTPUT);
  
  lcd.begin(16, 2);
  lcd.print("Slot-1 off");
  lcd.setCursor(0, 1);
  lcd.print("Slot-2 off");
}

void loop() {
  float duration1, distance1, duration2, distance2;

  // Sensor 1
  digitalWrite(TRIGGER_PIN1, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN1, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN1, LOW);
  duration1 = pulseIn(ECHO_PIN1, HIGH);
  distance1 = (duration1 / 2) / 29.1; // Calculate distance in cm
  
  // Sensor 2
  digitalWrite(TRIGGER_PIN2, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN2, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN2, LOW);
  duration2 = pulseIn(ECHO_PIN2, HIGH);
  distance2 = (duration2 / 2) / 29.1; // Calculate distance in cm
  
  // Display readings on LCD
  lcd.clear();
  if (distance1 < 10) {
    lcd.setCursor(0, 0);
    lcd.print("Slot-1 charging");
    digitalWrite(OUTPUT_PIN1, HIGH);
  } else {
    lcd.setCursor(0, 0);
    lcd.print("Slot-1 off");
    digitalWrite(OUTPUT_PIN1, LOW);
  }
  
  if (distance2 < 10) {
    lcd.setCursor(0, 1);
    lcd.print("Slot-2 charging");
    digitalWrite(OUTPUT_PIN2, HIGH);
  } else {
    lcd.setCursor(0, 1);
    lcd.print("Slot-2 off");
    digitalWrite(OUTPUT_PIN2, LOW);
  }

  delay(1000); // Adjust delay as needed for your application
}