#include <LiquidCrystal_I2C.h>
#include <DHT.h>
#include <ArduinoJson.h>
DynamicJsonDocument doc(1024);
LiquidCrystal_I2C lcd(0x27, 20, 4);
const int triggerPin = 12;
const int echoPin = 14;
const int dhtPin = 25;
DHT dht(dhtPin, DHT22);
void setup() {
  Serial.begin(115200);
  pinMode(triggerPin, OUTPUT);
  pinMode(echoPin, INPUT_PULLUP);
  lcd.begin(16, 2);
  lcd.init();
  lcd.backlight();
  lcd.begin(20, 4);
  delay(1000);
}
void loop() {
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  // Measure the echo time
  float duration = pulseIn(echoPin, HIGH);
  // Calculate the distance in centimeters
  // distance=duration×0.034cm/μs/2
  // 0.034 speed of sound in air
  float distance = duration * 0.034 / 2;
  float humidity = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float  temperature = dht.readTemperature();
  lcd.setCursor(0, 0);
  lcd.print("Humidity: ");
  lcd.println(humidity);
  lcd.print("%");
  lcd.setCursor(0, 1);
  lcd.print("Temp    : ");
  lcd.println(temperature);
  lcd.print(char(223));
  lcd.print("C");
  lcd.setCursor(0, 2); //(char)223 = degree symbol
  lcd.print("Distance: " + String(distance, 0) + " cm");
  lcd.setCursor(0, 3);
  lcd.print("Distance: " + String(distance / 30.48) + " feet ");
   String JsonData;
  doc["Temperature"] = temperature;
  doc["Humidity"] = humidity;
  doc["Distance in the cm"] = String(distance, 0);
  doc["Distance int the feet"] = String(distance / 30.48);
  serializeJson(doc, JsonData);
  Serial.println(JsonData);
  delay(1000); // Delay for readability
}