I wrote a simple program with goal of making an LED display at a random brightness each second. The problem is that the LED is always either on or off the brightness doesn't change. What am I missing?
int ledPin = 13; // LED connected to digital pin 13
int val = 0; // hold a random value
void setup() { // run once, when the sketch starts
pinMode( ledPin, OUTPUT ); // sets the digital pin as output
}
void loop() { // run over and over again
val = random( 256 ); // Generate a random number
analogWrite( ledPin, val ); // sets the LED brightness to random value
delay( 1000 ); // waits for a second
}