#include "DHT.h"
#define DHT_PIN 4 // The Arduino Nano pin connected to DHT22 sensor
#define DHT_TYPE DHT22
DHT dht22(DHT_PIN, DHT_TYPE);
void setup() {
  Serial.begin(9600);
  dht22.begin(); // initialize the sensor
}
void loop() {
  // wait a few seconds between measurements.
  delay(2000);
  // read humidity
  float humi = dht22.readHumidity();
  // read temperature as Celcius
  float temperature_C = dht22.readTemperature();
  // read temperature as Fahrenheit
  float temperature_F = dht22.readHumidity(true);

  // check if any reads failed
  if (isnan(humi) || isnan(temperature_C) || isnan(temperature_F)) {
    Serial.println("Failed to read from DHT Sensor!");
  } else {
    Serial.print("Humidity: ");
    Serial.print(humi);
    Serial.print("%");
    Serial.print(" | ");
    Serial.print("Temperature: ");
    Serial.print(temperature_C);
    Serial.print("°C ~ ");
    Serial.print(temperature_F);  
    Serial.println("°F");
  }
}

#include <Onewire.h>
#include <DallasTemperature.h>
// Data wire is connected to the Arduino digital pin 
#define  ONE_WIRE_BUS 4
// Setup a OneWire instance to communicate with any OneWire devices
Onewire onewire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature censor
DallasTemperature censors(&oneWire);
void setup(void)
{
  // Call censors.requestTemperatures() to issue a global temperature and Requests to all devices on the bus
  censors.requestTemperatures();
  Serial.print("Celcius temperature");
  // Why "byIndex"? You can have more than one IC on the same bus. 0 refers to the first IC on the wire
  Serial.print(censors.getTempCByIndex(0));
  Serial.print(" - Fahrenheit temperature: ");
  Serial.println(censors.getTempFByIndex(0));
  delay(1000);
}