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

// set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27,20,4);  

// Sensor HC-SR84. ---------- >
#define echoPin 2 // attach pin D2 Arduino to pin Echo of HC-SR04
#define trigPin 3 //attach pin D3 Arduino to pin Trig of HC-SR04
// defines variables
long duration; // variable for the duration of sound wave travel
int distance; // variable for the distance measurement
// End sensor section -------------<


void setup() 
{
  Serial.begin(9600);
//LCD  ----------------- <
  lcd.init();           
  lcd.backlight();
//Sensor  ------------>
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an OUTPUT
  pinMode(echoPin, INPUT); // Sets the echoPin as an INPUT
}

void loop() 
{

// Remap range from 0 to 400 to 0 to 100;
int acquiredValue = distance;
int value = map(acquiredValue, 0, 400, 0, 40);
int valueNew = (value, DEC);

  // ---------------- <
    // Clears the trigPin condition
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin HIGH (ACTIVE) for 10 microseconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  // Calculating the distance
  distance = duration * 0.034 / 2; // Speed of sound wave divided by 2 (go and back)
  

  // Displays the distance on the Serial Monitor
      Serial.print("Distance: ");
      Serial.print(distance);
      Serial.println(" cm");
  // Displays the distance range from 0 to 400 to 0 to 100;
      Serial.print("NEW VALUE: ");
      Serial.println(value);

     // Serial.println(value, DEC);

      Serial.println("___________________");



// Print distnace position
    lcd.setCursor(0, 0);
    lcd.print(value);

    delay(100);



 





               
}