#define echoPin 2
#define triggerPin 3
#include <LiquidCrystal_I2C.h>

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

float dist_cm;
float dist_inches;

long DistanceReader()
{
	pinMode(triggerPin, OUTPUT);  // Clear the trigger
	digitalWrite(triggerPin, LOW);
	delayMicroseconds(2);
	// Turn on the USD:Sets the trigger pin to HIGH state for 10 microseconds
	digitalWrite(triggerPin, HIGH);
	delayMicroseconds(10);
	digitalWrite(triggerPin, LOW);
	pinMode(echoPin, INPUT);
	// Reads the echo pin, and returns
	// the sound wave travel time in microseconds
	return pulseIn(echoPin, HIGH);
}

void setup()
{
	pinMode(LED_BUILTIN, OUTPUT);
  Serial.begin(9600);
  lcd.init();	// initialize the lcd
  // Print a message to the LCD.
  lcd.backlight();
  lcd.print("    Distance");
	delay(3000);
	lcd.clear();
}

void loop()
{
	
  dist_cm = 1.0/58 * DistanceReader();
	dist_inches = (dist_cm / 2.54);

// turn on the LED when distance less than 200 cm
	bool closeness = dist_cm < 200;
  digitalWrite(LED_BUILTIN, closeness); //

// Set up for printing in LCD
	lcd.setCursor(0,0);
	lcd.print("cm");
	lcd.setCursor(2,0);
	lcd.print(dist_cm,1);
	lcd.setCursor(7,0);
	lcd.print("  in");
	lcd.setCursor(11,0);
	lcd.print(dist_inches, 1);

// display for Distances good or bad
	if (dist_cm <= 200)
	{
		lcd.setCursor(1,1);
		lcd.print("D is too short");
}
	if (dist_cm >200)
	{
		lcd.setCursor(3,1);
		lcd.print("D is good");
	}
	
	delay(2000);
	lcd.clear();




}