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標題: DHT022-arduino [打印本頁]

作者: 深海冰封 時間: 2017-3-17 10:13
標題: DHT022-arduino
byte bGlobalErr;
byte dht_dat[5];

float Data_humidity;
float Data_temperature;

void setup(){
  pinMode(A1,OUTPUT);
  digitalWrite(A1,HIGH);
  Serial.begin(9600);
}

void loop(){
  ReadDHT();
  if(bGlobalErr==0){
      Data_humidity = (dht_dat[0]*256+dht_dat[1])/10;  //Calculate humidity %
      if ((dht_dat[2] & 0x7f) != dht_dat[2]) {    //Calculate temperature C
         dht_dat[2]= dht_dat[2] & 0x7f;
         Data_temperature = -1*(dht_dat[2]*256+dht_dat[3])/10;
      }
      else {
         Data_temperature = (dht_dat[2]*256+dht_dat[3])/10;
      }
      Serial.println(Data_humidity);
      Serial.println(Data_temperature);
  }
  delay(1000);
}

void ReadDHT(){
  bGlobalErr=0;
  byte dht_in;
  byte i;

  digitalWrite(A1,LOW);
  delay(18);
  digitalWrite(A1,HIGH);
  delayMicroseconds(30);
  pinMode(A1,INPUT);
  delayMicroseconds(40);
  dht_in=digitalRead(A1);
  delayMicroseconds(80);
  dht_in=digitalRead(A1);
  delayMicroseconds(80);

  for (i=0; i<5; i++)
dht_dat[i] = read_dht_dat();
  pinMode(A1,OUTPUT);
  digitalWrite(A1,HIGH);
};

byte read_dht_dat(){
  byte i = 0;
  byte result=0;
  for(i=0; i< 8; i++){
while(digitalRead(A1)==LOW);
delayMicroseconds(30);
if (digitalRead(A1)==HIGH)
   result |=(1<<(7-i));
while (digitalRead(A1)==HIGH);
  }
  return result;
}

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