Arduino 溫度+LED

#include "DHT.h"    //預載感測器所需之程式庫
#define DHTPIN D6     //預先定義 感測器信號名稱 接腳位置在 D6

#define redLED D1   //預先定義 LED 接腳位置
#define greenLED D2
#define blueLED D3

#define relayPin D4 //預先定義 繼電器 接腳位置

// 依感測器使用型號，移除該行之註解符號
#define DHTTYPE DHT11   // DHT 11
//#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)



//使用程式庫定義 感測裝置名稱(信號腳位，感測器型號)
DHT dht(DHTPIN, DHTTYPE); 
 
void setup() {
  Serial.begin(115200);
  Serial.println("DHT11 test!"); //於序列步監控視窗顯示提示訊息
  dht.begin();  //感測器裝置啟動致能
  pinMode(redLED,OUTPUT);   //LED腳位設為輸出
  pinMode(greenLED,OUTPUT);
  pinMode(blueLED,OUTPUT);

  pinMode(relayPin,OUTPUT);  //繼電器腳位設為輸出
}

void loop() {
  // Wait a few seconds between measurements.
  delay(2000);  //延時2秒

  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();  //浮點數變數 h 存放 讀取濕度數值
  // Read temperature as Celsius (the default) 預設讀取的溫度是"攝氏"
  float t = dht.readTemperature(); //浮點數變數 t 存放 讀取攝氏溫度數值
  // Read temperature as Fahrenheit (isFahrenheit = true) 讀取華氏溫度時，參數=true
  float f = dht.readTemperature(true); //浮點數變數 f 存放 讀取華氏溫度數值

  // 以下判斷是否讀取失敗=（無濕度值或無攝氏值或無華氏值)
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println("Failed to read from DHT sensor!"); //顯示讀取失敗訊息
    return; //脫離本函式且返回主程式
  }


  Serial.print("Humidity: ");
  Serial.print(h); //顯示濕度值
  Serial.print(" %\t"); //顯示單位且跳一個Tab格
  Serial.print("Temperature: ");
  Serial.print(t);  //顯示攝氏溫度值
  Serial.print(" °C = ");  //顯示單位
  Serial.print(f);  //顯示華氏溫度值
  Serial.println(" °F");  //顯示單位

  if (t<28)   //若 濕度大於80%，則
   {
      digitalWrite(redLED,HIGH);  //點亮共陽型紅燈
      digitalWrite(greenLED,LOW);  //滅掉綠燈
      digitalWrite(blueLED,HIGH);
   }
  else if(t> 28 & t < 30)   //若 濕度未大於80%，則
   {  
      digitalWrite(redLED,LOW);     //滅掉紅燈
      digitalWrite(greenLED,LOW);  //點亮綠燈
      digitalWrite(blueLED,HIGH);
   }
   else{
      digitalWrite(redLED,LOW);     //滅掉紅燈
      digitalWrite(greenLED,HIGH);  //點亮綠燈
      digitalWrite(blueLED,HIGH);
    
    }
  
}