Reading data from Arduino in Processing

Projects Interfacing w/ Software on the Computer
1

I'm in need of help; i can't interpret the data from a fluviometer and graph it in Processing. The first data (flowRate) is received just fine, the problem is that i don't know how to read two separate data (flowRate and totalMilliliters).

Arduino Code:

byte statusLed    = 13;

byte sensorInterrupt = 0;  
byte sensorPin       = 2;
float calibrationFactor = 4.5;
volatile byte pulseCount;  
float flowRate;
unsigned int flowMilliLitres;
unsigned long totalMilliLitres;

unsigned long oldTime;

void pulseCounter()
{
 pulseCount++;
}


void setup()
{
 

 
 Serial.begin(9600);
 pinMode(statusLed, OUTPUT);
 digitalWrite(statusLed, HIGH);
 pinMode(sensorPin, INPUT);
 digitalWrite(sensorPin, HIGH);

 pulseCount        = 0;
 flowRate          = 0.0;
 flowMilliLitres   = 0;
 totalMilliLitres  = 0;
 oldTime           = 0;

 attachInterrupt(sensorInterrupt, pulseCounter, FALLING);
}


void loop()
{
  
  if((millis() - oldTime) > 1000)    
 { 
   detachInterrupt(sensorInterrupt);
 
   flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor;
   
   oldTime = millis();
   
   flowMilliLitres = (flowRate / 60) * 1000;  
   
   totalMilliLitres += flowMilliLitres;

     
   unsigned int frac;
   
   
   //Serial.print("Flow rate: ");
   Serial.print(int(flowRate));  
   Serial.print(",");
   //Serial.print("L/min");
   //Serial.print("\t");      

   //Serial.print("Output Liquid Quantity: ");        
   Serial.println(totalMilliLitres);
   //Serial.println("mL"); 
   //Serial.print("\t");       
 //Serial.print(totalMilliLitres/1000);
 //Serial.print("L");
   

   pulseCount = 0;
   
   attachInterrupt(sensorInterrupt, pulseCounter, FALLING);

   
 }
}

Processing Code:

import processing.serial.*;

Serial myPort;  
String flowRate;  
String totalMilliliters;
float button=0;
int cont = 0;

void setup()
{
 size(800,700);
 noStroke();
 background(255);
 

 String portName = Serial.list()[1]; 
 myPort = new Serial(this, portName, 9600);
 print(portName);
}

void draw()
{
 background(255);
 
 stroke(0);
 line(50,50,50,500);
 line(50,500,700,500);
 for(int i=50; i<=500;i+=50)
 {
   stroke(0);
   line(45,i,55,i);
 }
 stroke(0);
 line(350,495,350,505);
 line(650,495,650,505); 
 
 //on off
 fill(255);
 stroke(0);
 rect(640,570,40,20);
 
 //               TEXTO
  fill(0);
 textSize(20);
 text("Flow rate: " +flowRate,50,600);
 
 fill(0);
 textSize(20);
 text("Volume:" +totalMilliliters,50,625);
 
 fill(0); //Grafica
 textSize(10);
 text("200 ml",10,450);
 text("400 ml",10,400);
 text("600 ml",10,350);
 text("800 ml",10,300);
 text("1.0 ml",10,250);
 text("1.2 ml",10,200);
 text("1.4 ml",10,150);
 text("1.6 ml",10,100);
 text("1.8 ml",10,50);
 text("1 s ml",340,550);
 text("2 s ml",640,550);
 text("On/Off",642,582);
 fill(button);
 ellipse(642,602,10,10);

 if(cont==1)
 {
  if ( myPort.available() > 0) 
  {  
   flowRate = myPort.readStringUntil('\n'); 
   totalMilliliters += flowRate;
   println(flowRate);  
   println(totalMilliliters);
  } 
 }
}

void mousePressed()
{
 if((mouseX>640 && mouseX<680)&&(mouseY>570 && mouseY<590))
 {
   cont = cont+1;
   button=255;
   if(cont>1)
   {
     cont=cont-2;
     button=0;
   }
 }
}
2

(deleted)

3 
  if ( myPort.available() > 0)
  {  
   flowRate = myPort.readStringUntil('\n');
   totalMilliliters += flowRate;
   println(flowRate);  
   println(totalMilliliters);
  }

You are sending "flow,volume" from the Arduino. Then, you just read everything into a String called flowRate in Processing.

Since you sent the data using a delimiter between the values and between the packets (using three statements), why are you trying to read everything using one statement?

Why are you doing serial IO in draw()? You really should implement the serialEvent() method AND you really should be using the bufferUntil() method (in setup()).