Bluetooth serial communication trouble

Projects Programming
1

I am trying out a HC-05 Bluetooth device with the code below to see if I can test the serial communication.

When writing on the PC serial monitor the data is transferred to the android tablet terminal all ok (running a Bluetooth terminal app).

But when I write in the tablet terminal and click on send nothing appears in the PC terminal.

am I missing something

The cables are connected correct TX from HC-05 to Arduino 15 and RX from HC-05 to Arduino 14

#include <SoftwareSerial.h>
SoftwareSerial BTserial(15, 14); //RX / TX

void setup() {
  Serial.begin(9600);
  Serial.println("Enter AT commands:");
  BTserial.begin(9600);
}

void loop() {
  // Read from BT and send to arduino serial monitor
  if (BTserial.available())
  {
    Serial.println(BTserial.read());
    Serial.println("test");
  }

  // read from arduino serial and send to BT
  if (Serial.available())
  {
    BTserial.println(Serial.read());
  }
}
2

steve8428:
am I missing something

#include <SoftwareSerial.h>

void setup() {
  Serial.begin(9600);
  Serial.println("Enter AT commands:");

}

Well, the intention is unclear. Are you really trying to send an AT command, or are you just trying to talk?
You might find the following background notes useful.

http://homepages.ihug.com.au/~npyner/Arduino/GUIDE_2BT.pdf
http://homepages.ihug.com.au/~npyner/Arduino/BT_2_WAY.ino

3

Arr yes forget to take the At serial part out. originally was following an example for AT communication which also checked communication between the device and PC.

In doing this I found the communication from tablet to PC is not working for some reason. I will have a look over your links thank you

4

Also to add if this helps

I can turn on an LED by sending a character from app inventor but only if I am using the main TX and RX pins on the Arduino (1 and 0) . This does not work with the SoftwareSerial changing the pins to 14 and 15 so I think this is where my problem is.

int led = 13;
char x;

void setup() {
 pinMode(led, OUTPUT);
 Serial.begin(9600);
}

void loop() {
  if (Serial.available()) {
    x = Serial.read();
 }
  delay(100);
  
  if (x == 'h'){
    digitalWrite (led, HIGH);
  }
  if (x == 'w'){
    digitalWrite (led, LOW);
  }
}
5

got it working using AltSoftSerial

#include <AltSoftSerial.h>
AltSoftSerial BTserial; //RX / TX

void setup() {
  Serial.begin(9600);
  Serial.println("Enter AT commands:");
  BTserial.begin(9600);
}

void loop() {
  // Read from BT and send to arduino serial monitor
  if (BTserial.available())
  {
    Serial.println(BTserial.read());
    Serial.println("test");
  }

  // read from arduino serial and send to BT
  if (Serial.available())
  {
    BTserial.println(Serial.read());
  }
}