void setup() {
  // put your setup code here, to run once:
  pinMode(9, OUTPUT);
  pinMode(11, OUTPUT);
}
void loop() {
  // put your main code here, to run repeatedly:
  //analogWwrite between 0 and 255
  //analogRead is between 0 and 1023
  analogWrite(9, analogRead(A3)/4);
  analogWrite(11, 255-analogRead(A3)/4);
}