draw.ino

// Variables for arduino
int valX;
int valY;
bool changedX;
bool changedY;

// Normalized values
int horizontalVal = 0;
int verticalVal = 0;

// Some allowance to reduce noise down

const int threshold = 5;


void setup() {
    Serial.begin(115200);
    
}


void loop() {
  valX = analogRead(A0);
  valY = analogRead(A2);
  changedX = abs( valX - horizontalVal) >= threshold || ( valX == 0 && horizontalVal !=0) || (valX == 1023 && horizontalVal != 1023); 
  changedY = abs( valY - verticalVal ) >= threshold || (valY == 0 && verticalVal !=0 ) || (valY ==1023 && verticalVal != 1023);

  if (changedX || changedY) {
    int invertedX = abs(1024 - valX);
    int invertedY = abs(1024 - valY);

    Serial.print(invertedX);
    Serial.print(",");
    Serial.println(invertedY);
    horizontalVal = valX;
    verticalVal = valY;   
    }

    delay(100);
}