Inconsistent values with Bluetooth and Serial.Read

Projects General Guidance
24

Try these.

Master:

void setup()
{
  Serial.begin(9600);
  delay(1);
  Serial.println("Transmitting");
}

void loop()
{
  Serial.print('H');
  delay(1000);
  Serial.print('L');
  delay(1000);
}

Slave: Keep in mind you will need to use Software serial if you want to use the Serial monitor, to see the received char.

char val; // variable to receive data from the serial port
int ledpin = 13; // LED connected to pin 13 (on-board LED) 

void setup() { 
  pinMode(ledpin, OUTPUT);  // pin 13 (on-board LED) as OUTPUT
  Serial.begin(9600);       // start serial communication at 115200bps, must match the transmitting side
  delay(1);               // 1 millisecond delay between starting the serial communication and sending out a message
  Serial.println("Receiving");    
}

void loop() 
{ 
  if( Serial.available() > 0)       //See if data is available to read
  {
    val = Serial.read();
    Serial.println(val);

    if( val == 'H' || val == 'h' )               // if 'H' was received
    {
      digitalWrite(ledpin, HIGH);  // turn ON the LED
    } 
    if( val == 'L' || val == 'l' ) 
    { 
      digitalWrite(ledpin, LOW);   // otherwise turn it OFF
    }
  }
}

Make sure the Serial monitor is set to 9600, otherwise you will see garbage in the terminal.

EDIT:
On second thought, they might need to be set to 9600, as per the default baud rate. I changed them.