RX/TX use with Arduino UNO

Hi,

why I cant use the Pin 0/1 for RX/TX on the Uno board with b4r ?
In the Adriano IDE it works fine to send data to a bluetooth shield.. See code/image

Code:

  #include "DHT.h"
#define dht_pin A5 //Pino DATA do Sensor ligado na porta Analogica A5
#define DHTTYPE DHT11
DHT dht(dht_pin, DHTTYPE);

void setup()
{
Serial.begin(9600);
delay(1000);
dht.begin();
}

void loop()
{
float h = dht.readHumidity();
float t = dht.readTemperature();

// Mostra os valores lidos, na serial...  

RX/TX use with Arduino UNO

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