Arduino 記事本 09 : DHT11溫濕度感知模組

網頁筆記本-009

Arduino 記事本 09 : DHT11溫濕度感知模組

原廠網頁：https://learn.adafruit.com/dht/overview
LIB下載網頁：https://learn.adafruit.com/dht/downloads
下載兩個LIB資料

• Arduino library and example code for DHT sensors
• Adafruit_Sensor library (required by the DHT library above)

下載回來解壓縮後將資料夾放入：Arduino\libraries\位置下

[Adafruit_Sensor-master]

[DHT-sensor-library-master]

重啟 Arduino，可於範例程式中找到DHTtester的程式範例

DHT11溫濕度感知模組
// 刪去註解
#include "DHT.h"
#define DHTPIN 2  // 選擇Arduino輸入接腳
#define DHTTYPE DHT11   // DHT 11 , 選擇選用的感知器
//#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)

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");
  Serial.print("Heat index: ");
  Serial.print(hic);
  Serial.print(" *C ");
  Serial.print(hif);
  Serial.println(" *F");
}

測試結果：