int pwm;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:
  //pwm = analogRead(0);
  pwm = analogRead(1);
  pwm = map(pwm, 0, 1023, 0, 255);
  pwm = constrain(pwm, 0, 255);
  analogWrite(3, pwm);
  Serial.println(pwm);
}