dht11 arduino例程

#include "DHT.h"

//#define DHTPIN 6     // Digital pin connected to the DHT sensor

#define DHTTYPE DHT11   // DHT 11

DHT dht(6, DHTTYPE);

int led2=7;
int led3=4;

unsigned char hexdata[8] = {0x5A,0xA5,0x05,0x82,0x00,0x01,0x00,0x00};
unsigned char hexdata2[8] = {0x5A,0xA5,0x05,0x82,0x00,0x02,0x00,0x00};
unsigned char hexdata3[8] = {0x5A,0xA5,0x05,0x82,0x00,0x04,0x00,0x00};
void setup() {
  Serial.begin(115200);  //
  Serial.println("测试开始");

  pinMode(led2,OUTPUT);
  pinMode(led3,OUTPUT);
  dht.begin();
}

void loop() {
  delay(500);     // 等一段时间给传感器检测，一般温度和湿度各需要250毫秒
  float h = dht.readHumidity();    //读湿度        int
  float t = dht.readTemperature();    //读温度
  int t1=t*100;
  int t2=t1/256;
// hexdata[6] = t2;
// hexdata[7] = t1-t2*256;
hexdata[7]=t2;
Serial.write(hexdata,8);
delay(100);
  int h1=h*100;
  int h2=h1/256;
// hexdata2[6] = h2;
// hexdata2[7] = h1-h2*256;
hexdata2[7]=h2;
Serial.write(hexdata2,8);
//5A A5 05 82 00 02 00 66
//  Serial.print("温度：");
// Serial.print(t);                        // 输出温度
// Serial.print("°C  湿度: ");      
//Serial.println(h);                        // 输出湿度
//  Serial.println("% ");
  if (h > 50) {
   hexdata3[7]=50;
  Serial.write(hexdata3,8);
  }
  if (h < 80) {
  digitalWrite(led2,LOW);
  }
  if (t > 23)  {  
       digitalWrite(led3,HIGH);
  }
  if (t < 23) {
  digitalWrite(led3,LOW);
  }
}