byte ledPin = 7;
byte Potensio = A0;

void setup()
{
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
}
void loop()
{
  int analogSignal = analogRead(Potensio);
  int brightness = map(analogSignal, 0, 1023, 0, 255);
  analogWrite(ledPin, brightness);
  Serial.print("analogSignal=  ");
  Serial.println(analogSignal);
  Serial.print("PWM signal=  ");
  Serial.println(brightness);
  delay(1000);
}