Arduino Code

#include <dht11.h>

void setup()
{
  Serial.begin(115200);
}

String top;
String bottom;
void loop()
{
  top = readDht(4);
  bottom = readDht(2);

  Serial.println(top+"::"+bottom);
  Serial.flush();
  delay(10000);
}

String readDht(int pin)
{
  dht11 sensor;

  int chk = sensor.read(pin);

  switch (chk)
  {
    case DHTLIB_OK:
                //Serial.println("OK");
                break;
    case DHTLIB_ERROR_CHECKSUM:
                //Serial.println("Checksum error");
                return "checksum";
                break;
    case DHTLIB_ERROR_TIMEOUT:
                //Serial.println("Time out error");
                return "timeout";
                break;
    default:
                //Serial.println("Unknown error");
                break;
  }

  float humidity = (float) sensor.humidity;
  float temperature = (float) sensor.temperature;

  int h = (int) humidity;
  int t = (int) temperature;

  return String(h)+"-"+String(t);
}