DHT11模块 Arduino代码补充

前引

Arduino中已经有关于DHT11的库，但是为了理解模块的运行原理，而写了这个代码，代码中的不足之处还请多多指正。

关于DHT11的原理，在之前的文章中已经提到过，就不再赘述。

代码部分

#define DHT11 15
void setup() {
Serial.begin(115200);

}

void loop() {
  dht();
  delay(2000);
}

void dht(){
double hum,tem;
pinMode(DHT11,OUTPUT);
digitalWrite(DHT11,HIGH);
delay(2);
digitalWrite(DHT11,LOW);
delay(25);
digitalWrite(DHT11,HIGH);
delayMicroseconds(30);
pinMode(DHT11,INPUT);
if(!digitalRead(DHT11)){
  Serial.println("ok");
  while(!digitalRead(DHT11));
  delayMicroseconds(10);
  while(digitalRead(DHT11));
  int humInt=getData();
  int humDec=getData();
  int temInt=getData();
  int temDec=getData();
  int Check=getData();
  if((humInt+humDec+temInt+temDec)==Check){
    if(humDec<10){
      hum=humInt+humDec/10.0;
    }else if(humDec<100){
      hum=humInt+humDec/100.0;
    }
    if(temDec<10){
      tem=temInt+temDec/10.0;
    }else if(temDec<100){
      tem=temInt+temDec/100.0;
    }
    Serial.print("温度：");
    Serial.print(tem);
    Serial.println();
    Serial.print("湿度：");
    Serial.print(hum);
    Serial.println();
  }
}
else{
  Serial.println("error");
}

}

int getData(){
    byte Data;
    byte temp;
    for(int i=0 ;i<8;i++){
    while(!digitalRead(DHT11));
    delayMicroseconds(35);
  
    if(digitalRead(DHT11)){
      temp=0x01;
    }else{
      temp=0x00;
    }
    Data<<=1;
    Data|=temp;
    while(digitalRead(DHT11));
    delayMicroseconds(10);
  }
return Data;
}