int ledPin=6;// LED connected to digital pin 6
int analogPin=A0;// potentiometer connected to analog pin A0
int value=0; // variable to store the read value
int out=0;
void setup()
{
  //A5 pin act as a INPUT
  pinMode(analogPin, INPUT);
  //12 pin act as a OUTPUT
  pinMode(ledPin,OUTPUT);

  //start communication of setup
  Serial.begin(9600);
}

void loop()
{
  //read the value from pin A5
  value=analogRead(analogPin);
  
  //print the value that has been read above
  Serial.println(value);
  
  
  //convert the value from 0-1023 to 0-255,bcx Potentiometer provide the value from 0-1023 but PWM support range between 0-255.
  out=map(value,0,1023,0,255); 
  analogWrite(ledPin, out);
}


// Another Method.

// int ledpin = 6;   // led connected to the digital pin 6.
// int analPin = A0; // Potentiometer connected to the analog pin A0.
// int val = 0;      // variable to store the read value. 

// void setup()
// {
//   pinMode(ledpin, OUTPUT); // sets the pin as output.
// }

// void loop()
// {
//   val = analogRead(analPin);  //Reads the Input Pin.
  
//   /*
//   analogRead value go from 0 to 1023,
//   analogWrite from 0 to 255.
//   */
//   analogWrite(ledpin, val/4); //Dividing it by 4 reduces the range to 0-255.
// }