How do I improve Bluetooth communication?

You will see, in this image using the Bluetooth monitor application, in order to receive the "ON" response, I had to repeatedly send the "O" character:

enter image description here

The code that I'm using now is this:

#include <SoftwareSerial.h>
const int RX_PIN = 0;
const int TX_PIN = 1;
char c = 'F';
boolean activar = false;

SoftwareSerial blueTooth(RX_PIN, TX_PIN);
void setup ()

void loop ()
  if(Serial.available() > 0){
    c = Serial.read();
    if(c == 'O'){
      activar = true;
    if(c == 'F'){
      activar = false;

void detectarObstaculos(){


How could I improve the response time?

  • 1
    Why are you using software serial on pins 0 and 1? How do you expect to work alongside hardware serial which also uses pins 0 and 1? – gre_gor Apr 11 '18 at 17:31
  • I see it on a tutorial (instructables.com/id/…) Is that the problem then? – TwoDent Apr 11 '18 at 17:33
  • The (unused) bluetooth SoftwareSerial object is conflicting with the HardwareSerial object on the same pins that you are using. One or the other. Make your mind up. – Majenko Apr 11 '18 at 17:33
  • Instructables is full of crap. It should be deleted from the internet. – Majenko Apr 11 '18 at 17:33
  • Ugh, so the tutorial was bad .... I see. @Majenko, I will change my pins then – TwoDent Apr 11 '18 at 17:35

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