Ok, so I have a bluetooth serial connection to a robot with a compass attached. I'm trying to get it to send back the heading value to a Processing sketch.

here's the recieve code:

Code:

void getHeadingValue()
  {
    
    if ( myPort.available() > 0) {  // the available check method returns an int that is the value if the port
    // if it is more than 0 then it means that there is a value
    rawHeading = myPort.read(); //raw heading is whatever the compass returns
    println("Raw Heading" + rawHeading);
  }
  else
  {
    println("myPort is not greater than 0");
  }
    
    
  }
 

As of now it perpetually prints "myPort is not greater than 0".

This is the code I'm trying to get to send heading. I get the right thing printed out over serial, I just need to send it.

Code:

#include <Wire.h>
int HMC6352Address = 0x42;
// This is calculated in the setup() function
int slaveAddress;
int ledPin = 13;
boolean ledState = false;
byte headingData[2];
int i, headingValue;
void setup()
{
// Shift the device's documented slave address (0x42) 1 bit right
// This compensates for how the TWI library only wants the
// 7 most significant bits (with the high bit padded with 0)
slaveAddress = HMC6352Address >> 1;   // This results in 0x21 as the address to pass to TWI
Serial.begin(9600);
pinMode(ledPin, OUTPUT);	// Set the LED pin as output
Wire.begin();
}
void loop()
{
  // Flash the LED on pin 13 just to show that something is happening
  // Also serves as an indication that we're not "stuck" waiting for TWI data
  ledState = !ledState;
  if (ledState) {
    digitalWrite(ledPin,HIGH);
  }
  else
  {
    digitalWrite(ledPin,LOW);
  }
  // Send a "A" command to the HMC6352
  // This requests the current heading data
  Wire.beginTransmission(slaveAddress);
  Wire.send("E");		  // The "Get Data" command
  Wire.endTransmission();
  delay(10);			 // The HMC6352 needs at least a 70us (microsecond) delay
  // after this command.  Using 10ms just makes it safe
  // Read the 2 heading bytes, MSB first
  // The resulting 16bit word is the compass heading in 10th's of a degree
  // For example: a heading of 1345 would be 134.5 degrees
  Wire.requestFrom(slaveAddress, 2);	  // Request the 2 byte heading (MSB comes first)
  i = 0;
  while(Wire.available() && i < 2)
  { 
    headingData[i] = Wire.receive();
    i++;
  }
  headingValue = headingData[0]*256 + headingData[1];
Serial.write (int(headingValue));
 

As of now its not working. Is Serial.write the right method to use for the robot?