Trouble connecting 2x mega2560's using 2x HC-05

Projects Networking, Protocols, and Devices
1

So I need to take 8 analog inputs and send them from one of the arduinos and then receive it at the other arduino and send it to PWM outputs with a range of 0-180. Before I do this I tried to send a byte and I can't get it to work.

The HC-05 modules are programmed using AT commands for one as a master and one as a slave. Both can pair with each other automatically and have the same baud/stop/parity of 38,000/0/0.

My code for the master arduino is:

#include <SoftwareSerial.h>

SoftwareSerial BT(19,18);

void setup() 
{
  Serial.begin(38400);
  BT.begin(38400);
}

void loop() 
{
  byte c = ',';
  BT.write(c);
  
  delay(5);
}

My code for the Slave arduino is:

#include <SoftwareSerial.h>
SoftwareSerial BT(19,18);

byte c;

void setup() 
{                
  Serial.begin(38400);
  BT.begin(38400);
}

void loop() 
{
   if (BT.available()) 
  {
    c = BT.read();
     Serial.println(c);
  }
  
  delay(2000);
}

I've tried changing both data types to char, int, uint8_t, and nothing works. Also tried changing the baud rates of both the serial monitor and the bluetooth modules and nothing there either. Can anyone spot something weird since this is my first time ever programming bluetooth modules and arduinos.

2

I won't ask why you are using software serial when your Megas have four, yes four, hardware serial ports. In the light of that, your code doesn't merit perusal, but I notice that the number 38400 is in there and, if you insist on such a dopey move as using software serial, that might be a cause of your problem - maybe even the only cause. Try 9600, and then be more forthcoming about exactly what happens, also the wiring and the LEDs. Using 38400 to the serial monitor is OK, provided the monitor is set to match.

You can test the code by connecting the Megas by cable. If that is OK, arduino is innocent and bluetooth is suss. Similarly, you can test the slave by using hardware serial and simply using the serial monitor. You may then use bluetooth with no change to the code.