void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(27,OUTPUT);
  pinMode(34, INPUT);
}

void loop() {
  int volt = analogRead(34);
  int intensity = map(volt,0,4095,0,255);
  analogWrite(27,intensity);

  Serial.println("volts : " +String(volt));
  Serial.println("intensity : " +String(intensity));
  delay(500);
}