// Gamma correction example: 
// The left LED has a gamma factor of 2.8 (the default),
// and the right LED has a gamma factor of 1.0 (no correction).

void setup() {
  pinMode(10, OUTPUT);
  Serial.begin(9600);
}

void loop() {

  int pwm=analogRead(A0);
  analogWrite(10,pwm/4);
  Serial.println(float(pwm/4)*5/255);
  /*
  for (int i=0; i<255; i=i+5){
    analogWrite(10, i);
    float v=i*5.0/255;
    Serial.println(v);
    delay(500);
  }

 for (int i=255; i>0; i=i+5){
    analogWrite(10, i);
    float v=i*5.0/255;
    Serial.println(v);
    delay(500);
  }
  */
/*
  analogWrite(10, 1);
  Serial.println("1");
  delay(500);
  analogWrite(10, 10);
  Serial.println("10");
  delay(500);
  analogWrite(10, 100);
  Serial.println("100");
  delay(500);
  analogWrite(10, 255); // 100% duty cycle
  Serial.println("255");
  delay(500);
  */
}