Adjustable led brightness using potentiometer

Other Hardware LEDs and Multiplexing
1

int potPin= A0; //Declare potPin to be analog pin A0
int LEDPin= 9; // Declare LEDPin to be arduino pin 9
int readValue; // Use this variable to read Potentiometer
int writeValue; // Use this variable for writing to LED

void setup() {
pinMode(potPin, INPUT); //set potPin to be an input
pinMode(LEDPin, OUTPUT); //set LEDPin to be an OUTPUT
Serial.begin(9600); // turn on Serial Port
}

void loop() {

readValue = analogRead(potPin); //Read the voltage on the Potentiometer
writeValue = (255/1023) * readValue; //Calculate Write Value for LED
analogWrite(LEDPin, writeValue); //Write to the LED
Serial.print("You are writing a value of "); //for debugging print your values
Serial.println(writeValue);
}
This simple code will not turn in my led to be able to adjust it need help

2

This simple code will not turn in my led to be able to adjust it need help

No.
How have you got things wired up?

3 
writeValue = (255/1023) * readValue; //Calculate Write Value for LED

Strange way.

writeValue = readValue >> 2; // calculate write value for LED

Correct (bitshift) way.
Leo..

4

In fact Wawa has it:-

writeValue = (255/1023) * readValue;

The division in the brackets will result in a zero value because it is an integer division. So if you must do it this way then:-

writeValue = (255.0/1023.0) * float(readValue);
5

More efficient (using only ints not floats, which are way slower)

writeValue = 255L * readValue / 1023;

But not as efficient as the shift method mentioned above.

P.S use code tags in future please!