ตัวอย่าง การใช้งาน Sensor DHT22 https://www.ab.in.th/b/22

dht22.ino

/*
  ตัวอย่าง การใช้งาน Sensor DHT22 สินค้า 
  บทความ : https://www.ab.in.th/b/22
  Download Library LCD I2C : https://download.เอบี.ไทย/d.php?file=Arduino-LiquidCrystal-I2C-library-master.zip
  Download Library DHT22 : https://download.เอบี.ไทย/d.php?file=DHT-sensor-library-master.zip
*/

#include "DHT.h"
#define DHTPIN 2     // what digital pin we're connected to

#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321

 DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  Serial.println("DHTxx test!");
  dht.begin();
}

void loop() {
  delay(2000);
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);

  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  float hif = dht.computeHeatIndex(f, h);
  float hic = dht.computeHeatIndex(t, h, false);

  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(t);
  Serial.print(" *C ");
  Serial.print(f);
  Serial.print(" *F\t");
  Serial.print("Heat index: ");
  Serial.print(hic);
  Serial.print(" *C ");
  Serial.print(hif);
  Serial.println(" *F");

 }