// YWROBOT
// Compatible with the Arduino IDE 1.0
// Library version:1.1
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);
#define DHTPIN 4   
float cm;
float inches;
#define DHTTYPE    DHT22  
DHT_Unified dht(DHTPIN, DHTTYPE);
uint32_t delayMS;


long readUltrasonicDistance(int triggerPin, int echoPin)
{
	pinMode(triggerPin, OUTPUT);  // Clear the trigger
	digitalWrite(triggerPin, LOW);
	delayMicroseconds(2);
	// 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()
{
dht.begin();
sensor_t sensor;
  dht.temperature().getSensor(&sensor);
	dht.humidity().getSensor(&sensor);
	 delayMS = sensor.min_delay / 1000;
 lcd.init(); 
  lcd.backlight();
		lcd.setCursor(0,0);
  lcd.print("--> Distance <--");
		lcd.setCursor(3,1);
		lcd.print("-->temp <--");
	delay(3000);
	lcd.clear();

	
}

void loop()
{
	

  cm = 0.0344/2 * readUltrasonicDistance(3, 2);
	inches = (cm / 2.54);

	lcd.setCursor(0,0);
	lcd.print("Inches");
	lcd.setCursor(4,0);
	
	lcd.setCursor(12,0);
	lcd.print("cm");
	
	lcd.setCursor(1,1);
	lcd.print(inches, 1);
	
	lcd.setCursor(11,1);
	lcd.print(cm, 1);
	lcd.setCursor(14,1);


delay(2000);
	lcd.clear();
		 delay(delayMS);
  sensors_event_t event;
  dht.temperature().getEvent(&event);
	 dht.humidity().getEvent(&event);
 

//if (isnan(event.temperature)) {
lcd.setCursor(0,0);
	lcd.print("temp");
	lcd.print(event.temperature);
	lcd.setCursor(4,0);


lcd.setCursor(0,1);
	lcd.print("humidity");
	lcd.print(event.relative_humidity);
	lcd.setCursor(4,0);

	delay(1000);
	lcd.clear();
}