const int LED = 12;
int brightness = 0;
int fadeAmount = 20;

void setup() {
  Serial.begin(9600);
  pinMode(LED, OUTPUT);
}

void loop() {
  analogWrite(LED, brightness);
  brightness += fadeAmount;
  if (brightness <= 0 || brightness >= 255){
    fadeAmount = -fadeAmount;
  }

  int value = analogRead(A0);
  float voltage = value * (5.0 / 1023);
  Serial.println(voltage);
  
  delay(15);
}