This is a part of a program i am writing. processing is working with arduino, that send on serial a string with millis(), the data that is read from his distance sensor and a value that indicate what sensor is connected to arduino.
It seems that there is a loss of data during the transfer because tre program give me an "ArrayOutOfBoundsExceptions" when i call lettura[2]. someone can help me?


float letturaSpazio=0;
float letturaTempo=0;
String[] lettura=new String[3];

void acquisizione()
{
  String myString = null; //string that read the data form Arduino
  if (porta.available() > 0)
  {
    myString = porta.readStringUntil(10); //read until new line
    if (myString != null)
    {
      lettura= split(myString,':'); //split the values of time, distance,and the type of the sensor in an array
      if(gira==1) //if the program is going
      {
      letturaTempo=float(lettura[0]);  //save the time into a float global
      letturaSpazio=float(lettura[1]);  //save the distance into a float global
      }
      println(int(lettura[2])); //ERROR
      porta.clear();
    }
  }
}

void grafic(String myDato, int x, int y){
  fill(0);
  line(x,y,x,y-200);
  line(x,y,x+400,y);
 
  float[] dato=float(split(myDato,':');

  for(int i=1;i<=a;i++) {
    line(x,y-map(dato[i-1],0,1,0,200),x+4,y-map(dato[i],0,1,0,200));
  }
}

this is a part of a program i made to draw with processing a grafic of distance acquired with the ARDUINO board.

to send the data to the function grafic i need to join the array in the main with the function join and then i have to split it in the function but in the 5th line processing found an error:
expecting DOT found 'dato'

can someone help me?