"The Arduino experiment" Experiment a: DHT11 detecting a current ambient temperature and humidity

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Content Experiments

使用DHT11温湿度传感器检测当前环境的温湿度，并在串口输出当前检测出的温度以及湿度情况。

Please click on the content and understand the relevant parameters DHT11

Experimental device

• arduino X 1
• Temperature and humidity sensors X 1 DHT11
• USB data cable programming X 1
• DuPont line X 3

Experiments connection

DHT11	Arduino
VCC	5V
GND	GND
DATA	8

Experimental circuit diagram

Experimental Procedure

1.根据连线表格以及实验电路图，将DHT11与Arduino开发板进行连接；
2.将Arduino开发板与电脑通过USB烧写线进行连接
3.使用Arduino IDE将代码验证并上传
4.打开串口监视器，查看DHT11输出的当前环境的温度以及湿度

Experiment Code

#include <dht11.h>   //引用dht11库文件，使得下面可以调用相关参数
#define dht11Pin 8   //定义温湿度针脚号为2号引脚
dht11 dht;    //实例化一个对象
void setup()    //初始化函数，只执行一次
{
  Serial.begin(9600);      //设置波特率参数
  pinMode(dht11Pin, OUTPUT);    //通过定义将Arduino开发板上dht11Pin引脚(8号口)的工作模式转化为输出模式
}
void loop()     //loop函数，重复循环执行
{
  int tol = dht.read(dht11Pin);    //将读取到的值赋给tol
  int temp = (float)dht.temperature; //将温度值赋值给temp
  int humi = (float)dht.humidity; //将湿度值赋给humi
  Serial.print("Tempeature:");     //在串口打印出Tempeature:
  Serial.print(temp);       //在串口打印温度结果
  Serial.println("℃");    //在串口打印出℃
  Serial.print("Humidity:");     //在串口打印出Humidity:
  Serial.print(humi);     //在串口打印出湿度结果
  Serial.println("%");     //在串口打印出%
  delay(1000);      //延时1秒
}

}

Experimental results

Experiment with library files

DHT11 library file download
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