Making bigger and smaller circles on Processing

Processing forum is not accessible for moment, so I decided to refer here for some help. I would like to do something simple for start making circles bigger and smaller from data collected from Arduino sketch:

int val;

void setup(){
  Serial.begin(9600);
}

void loop(){
  
  for(int i=0; i<=1023; i++){
  i=i+1;
  val=i;
Serial.println(val);
delay(50);
}

for(int i=1024; i>=1; i--){
  i=i-1;
  val=i;
  Serial.println(val);
  delay(50);
}
}

Processing forum is not accessible for moment

That's your problem. not ours.