void setup() {
  Serial.begin(9600);
  pinMode (A0, INPUT);
  pinMode (9, OUTPUT);
  pinMode (10, OUTPUT);
  pinMode (11, OUTPUT);
}
void loop() {
  int data = analogRead(A0);
  Serial.print("Data = " + String(data));
  float resolution = 5.0 / 1023;
  float volt = data * resolution; 
  Serial.print("\t Volt = " + String(volt));//
  int p = map(data, 0, 1023, 0, 100);//
  Serial.println("\t p=" + String(p));//
  analogWrite(11, p * 2.55);
  analogWrite(10, p * 2.55);
  analogWrite(9, p * 2.55);
  delay(250);
}