Receive Multiple Sensor Information from Arduino to Processing

dreemsp

Hello all,

I am new to Processing. Currently I am working with a simple ultrasonic distance sensors and with Arduino Mega. The question is:

How can I receive mutiple sensor information at every instance of time in processing from Arduino side it transmits via serial port. I worked with an example of single sensor and it works fine. But how about multiple sensors via serial communication.

Kindly let me know. Thanks in advance.

bilmor

The basic idea I use is to print from the Arduino a line of tab-separated values from the sensors:

int count = 6;
int val = 0;

void setup()
{
  Serial.begin(9600);
}

void loop()
{
  for (int i = 0;i<count;i++)
  {
    val = analogRead(i);

    Serial.print(val);
    Serial.print("\t");
  }
  Serial.println();
}

and here is the Processing code to read those values:

// serialEvent method is run automatically
// whenever the buffer receives a linefeed byte 

void serialEvent(Serial myPort) 
{ 
  // read the serial buffer:
  String myString = myPort.readStringUntil(linefeed);

  // if we get any bytes other than the linefeed:
  if (myString != null) 
  {
    // remove the linefeed
    myString = trim(myString);

    // split the string at the tabs and convert the sections into integers:
    int mysensors[] = int(split(myString, '\t'));
    count = mysensors.length;

    for (int i=0; i<count; i++)
    {
      // set sensor[i] value for use in draw()
      sensors[i].value = mysensors[i];   <--- you'll need to change this line to put
                                                 the values where you want them
      // print out the values we got:
      print(i + ": " + sensors[i].value + "\t");
    }
    println();
  }
}

The line you'll need to change will put the values into a global array where the main body of your program can read them. In my case it's the sensors[] array of Sensor objects I created.

HTH...

dreemsp

Thank you very much for your quick response... Now I can transfer multiple sensor information from my Arduino to Processing and visualize them.... :)>-