#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#define IR_SENSOR_PIN 34       // Analog pin connected to IR sensor output
#define THRESHOLD 50           // Threshold for detecting disconnection

// LCD address and size
LiquidCrystal_I2C lcd(0x27, 16, 2); // Change address to 0x3F if 0x27 doesn't work

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("IR Sensor Readings");
}

void loop() {
  int sensorValue = analogRead(IR_SENSOR_PIN); // Read the analog value from IR sensor
  
  // Simple distance estimation (not exact, depends on your sensor)
  float distance = map(sensorValue, 0, 4095,  1, 25); // Maps sensor value to 1mm to 25mm range
  
  // Display readings on the LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  
  if (sensorValue < THRESHOLD) { // Check if sensor value is below threshold
    lcd.print("No input detected");
    lcd.setCursor(0, 1);
    lcd.print("Connect sensor");
  } else {
    lcd.print("Distance: ");
    lcd.print(distance, 1);
    lcd.print(" mm");
    lcd.setCursor(0, 1);

  }

  delay(1000); // Update every second
}