Bluetooth Serial Communication HC06

Projects Programming
1

My project is currently trying to control a tank powered by an Arduino Mega 2560 through Bluetooth from my computer. Little bit of background:

The idea of the project is to use W, A, S, D to control the tank. Currently, I am tryin to figure out the Bluetooth serial communication by simply entering keys into the serial port and then the LED on the Arduino will blink for a second to show that data has been received. After I connect pair the Bluetooth module to my laptop and then connect through Tera Term at the correct COM Port, the red blinking light on the module turns solid red (from what I have read, this indicates that I the module is fully connected). Additionally , I have tried downloading the basic code for the HC - 06 for its commands, but when I send "AT" in the Arduino Serial Monitor, there is no "OK" back. If anyone could give me some guidance, much would be appreciated! My program for checking data being sent with the LED is posted below.

#include <SoftwareSerial.h>

#define LED 13

SoftwareSerial BTSerial(14,15); // RX | TX
// HC-06 TX to the Arduino RX on pin 14. 
// HC-06 RX to the Arduino TX on pin 15.
 

void setup() 
{
    Serial.begin(9600);
    BTSerial.begin(9600);  
    pinMode(LED, OUTPUT);
}
 
void loop()
{
 if(BTSerial.available())
 {
  digitalWrite(LED, HIGH);
  delay(1000);
  digitalWrite(LED, LOW);
 }
}
2

So you are using a Mega, which has four (4) hardware serial ports, and you are using software serial. I bet that isn't a good idea. Further, I see you are using that software serial on hardware serial pins, which. is a seriously bad one. No damage done - except to your image. Get rid of all references to software serial, and simply call it serial3, as is clearly marked on the pins.

3

If you have data available, you will have to read it. Else your LED will switch on for one second, switch off and immediately switches on again for one second.

As mentioned by @Nick_Pyner, use hardware serial.

#define LED 13
#define BTSerial Serial3
// HC-06 TX to the Arduino RX on pin 14.
// HC-06 RX to the Arduino TX on pin 15.

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

void loop()
{
  if (BTSerial.available())
  {
    BTSerial.read();
    digitalWrite(LED, HIGH);
    delay(1000);
    digitalWrite(LED, LOW);
  }
}

Be aware that depending on the line-ending setting in Serial Monitor, it might add a and/or a in which case you will receive a little more that expected.