Arduino read temperature

1、 Installation temperature and humidity DHT11 library

step ： project -》 Load the library -》 add to .ZIP Load the library （ Select to put your own compressed file ）

2、 Physical connection

There are two different temperature and humidity modules

Temperature and humidity module	Development board
VCC	3.3V
GND	GND
DAT	Pin （ Self determination ）

3、 Run code

//  introduce  DHT  The library files , without , Download it from the Internet first , stay  Arduino  Import 
#include <dht11.h>

dht11 DHT11;

//  Set up  DHT  Pin   by  Pin 8, This is what I define 
#define DHT11PIN 8

void setup() {
    
  Serial.begin(9600);
  Serial.println("DHT11 TEST PROGRAM");
  Serial.print("LIBRARY");
  //  Output  DHT  The version number of the library 

  Serial.println();
}

void loop() {
    
  Serial.println("\n");

  int chk = DHT11.read(DHT11PIN);

  //  test  DHT  Whether it is connected correctly 
  Serial.print("Read sensor: ");
  switch (chk)
  {
    
    case DHTLIB_OK: 
    Serial.println("OK"); 
    break;
    case DHTLIB_ERROR_CHECKSUM: 
    Serial.println("Checksum error"); 
    break;
    case DHTLIB_ERROR_TIMEOUT: 
    Serial.println("Time out error"); 
    break;
    default: 
    Serial.println("Unknown error"); 
    break;
  }

  //  Obtain measurement data 
  Serial.print("Humidity (%): ");
  Serial.println((float)DHT11.humidity, 2);

  Serial.print("Temperature °C): ");
  Serial.println((float)DHT11.temperature, 2);

  delay(2000);
}

4、 Exhibition