modul 2 arduino

#include <DHT.h>

int redLed = 4;
int greenLed = 5;
int blueLed = 6;
int yellowLed = 7;
#define DHT11_PIN 12
DHT dht(DHT11_PIN, DHT11);

void setup() {

  pinMode(redLed, OUTPUT);
  pinMode(greenLed, OUTPUT);
  pinMode(blueLed, OUTPUT);
  pinMode(yellowLed, OUTPUT);

  Serial.begin(9600);
  dht.begin();
  }

void loop(){

      float humidity = dht.readHumidity();
      float temperature = dht.readTemperature();


      if (isnan(humidity) || isnan(temperature)) {
        Serial.println("Failed to read from DHT sensor!");
        return;
      }


      Serial.print(humidity);
      Serial.print(",");
      Serial.println(temperature);

  if(Serial.available()){

    char val = Serial.read();

    if(val == 'r'){
      digitalWrite(4, HIGH);
      }
    if(val == 'g'){
      digitalWrite(5, HIGH);
      }
    if(val == 'b'){
      digitalWrite(6, HIGH);
      }
    if(val == 'y'){
      digitalWrite(7, HIGH);
      }
    if(val == 's'){
      digitalWrite(4, LOW);
      }
    if(val == 'h'){
      digitalWrite(5, LOW);
      }
    if(val == 'c'){
      digitalWrite(6, LOW);
      }
    if(val == 'z'){
      digitalWrite(7, LOW);
      }



      }
    }