#include<Wire.h>
#include<LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
#include <Adafruit_AHT10.h>
Adafruit_AHT10 aht;
int relay = 26;
const int trigPin = 5;
const int echoPin = 18;
#define SOUND_SPEED 0.034
#define CM  1
long duration;
float distanceCm;

void setup() {
  Serial.begin(115200);
  Serial.println("Adafruit AHT10 demo!");

  if (! aht.begin()) {
    Serial.println("Could not find AHT10? Check wiring");
    while (1) delay(100);
  }
  Serial.println("AHT10 found");
  lcd.init();
  lcd.backlight();
  pinMode(relay, OUTPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}
void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);

  distanceCm = duration * SOUND_SPEED / 2;

  sensors_event_t humidity, temp;
  aht.getEvent(&humidity, &temp);
  Serial.print("Temp:");
  Serial.print(temp.temperature);
  Serial.print(" ํC");
  Serial.print(" Humi:");
  Serial.print(humidity.relative_humidity);
  Serial.println("%Rh");
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);

  lcd.setCursor(0, 0);
  lcd.print("T:");
  lcd.print(temp.temperature, 1);
  lcd.setCursor(7, 0);
  lcd.write( 223);
  lcd.print("C");
  lcd.setCursor(10, 0);
  lcd.print("H:");
  lcd.print(humidity.relative_humidity, 1);
  lcd.print(" %");
  lcd.setCursor(0, 1);
  lcd.print("D:");
  lcd.print(distanceCm, 1);
  lcd.setCursor(7, 1);
  lcd.print("cm");
  
  if (temp.temperature <= 25) {
    digitalWrite(relay, 0);
    lcd.setCursor(10, 1);
    lcd.print("R:ON ");
  } 
  
  if (temp.temperature >= 26) {
    digitalWrite(relay, 1);
    lcd.setCursor(10, 1);
    lcd.print("R:OFF");
  }
  
  delay(500);
}