【Arduino】DHT11 溫濕度模組

試了半天 

原來加個10K電阻就有了

lib放進library裡面

#include    
dht DHT;
#define DHTLIB_OK                0
#define DHTLIB_ERROR_CHECKSUM   -1
#define DHTLIB_ERROR_TIMEOUT    -2
#define DHTLIB_INVALID_VALUE    -999
// the setup function runs once when you press reset or power the board
void setup() {
  Serial.begin(9600);
}

// the loop function runs over and over again forever
void loop() {
  int chk = DHT.read11(7);
  switch (chk)
  {
    case DHTLIB_OK:  
    Serial.println("OK,\t"); 
    break;
    case DHTLIB_ERROR_CHECKSUM: 
    Serial.println("Checksum error,\t"); 
    break;
    case DHTLIB_ERROR_TIMEOUT: 
    Serial.println("Time out error,\t"); 
    break;
    default: 
    Serial.println("Unknown error,\t"); 
    break;
  }
  Serial.println("Humidity = ");   
  Serial.print(DHT.humidity);   
  Serial.print("% ");   
  Serial.print("temperature = ");   
  Serial.print(DHT.temperature);   
  Serial.println("C ");   
  delay(1000);
  }

程式參考

http://playground.arduino.cc/Main/DHTLib