GAY's homework

#include "DHT.h"

#define Temp_Sensor 2
#define DHTTYPE DHT22

#define    red_led 13
#define yellow_led 12
#define  green_led 11

DHT dht(Temp_Sensor, DHTTYPE);

void setup()
{
    Serial.begin(9600);
    dht.begin();
}

void loop()
{
    float t = dht.readTemperature();
    Serial.print(F("%  Temperature: "));
    Serial.print(t);
    Serial.println(F("°C "));
    if(t > 40)
    {
      digitalWrite(red_led   ,HIGH);
      digitalWrite(yellow_led, LOW);
      digitalWrite(green_led , LOW);
    }
    if(t >= 37 && t <= 40)
    {
      digitalWrite(red_led   , LOW);
      digitalWrite(yellow_led,HIGH);
      digitalWrite(green_led , LOW);
    }
    if(t < 37)
    {
      digitalWrite(red_led   , LOW);
      digitalWrite(yellow_led, LOW);
      digitalWrite(green_led ,HIGH);
    }
    delay(1000);
}