DHT11 temperature and humidity detectionsensor

				
					#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>//OLED library
#include <DHT.h>//DHT11 library
DHT dht(8, DHT11);//Set the communication pins and models between DHT11 and Arduino
Adafruit_SSD1306 display(128,64, &Wire, -1);//Set the screen size of OLED
void setup()
{
  pinMode(7,OUTPUT);//Motor signal output
  dht.begin();//Dht11 initialization
  Serial.begin(9600);//Configure serial port baud rate
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);//Initialize OLED and set IIC communication address
}
void loop()
{  
  float h = dht.readHumidity();//Read Temperature
  float t = dht.readTemperature();//Read humidity
  display.clearDisplay();//Clear screen
  display.setTextColor(WHITE);//Setting text color, monochrome OLED is invalid, but must have
  display.setTextSize(2);//Set text size
  if(t>=26)//If the temperature is greater than 26
  {
    display.setCursor(0,40);
    display.print("Warning!");
    digitalWrite(7,HIGH);//Start the fan
    }
  else
  {
    display.setCursor(0,40);
    display.print("Safe");
    digitalWrite(7,LOW);//stop the fan
    }
  display.setCursor(0, 0);//Set the starting X and Y axes of the text
  display.print("Temp:");
  display.print(t,1);//One decimal place
  display.print("C");
  display.setCursor(0, 20);
  display.print("Humi:");
  display.print(h,1);
  display.print("%");
  display.display();//Execute Display
  delay(1000);//Reduce the read frequency of DHT11 to prevent read failures
}