const int button =10;             // GPIO 10 for the button
const int led =11;                // GPIO 11 for the LED
int ledflag =0;                   // LED status flag
int brightness = 0;               // how bright the LED is
int fadeAmount = 5;               // how many points to fade the LED by

void setup() {
  pinMode(button,INPUT);          // define button as an input 
  pinMode(led,OUTPUT);            // define LED as an output
  digitalWrite(led,LOW);          // turn output off just in case
}

void loop() {
  if (digitalRead(button)==HIGH){ // if button is pressed
    if (ledflag==0)
    {                             // and the status flag is LOW
      ledflag=1;                  // make status flag HIGH
                                  // set the brightness of pin 9:
                  analogWrite(led, brightness);
                                  // change the brightness for next time through the loop:
                  brightness = brightness + fadeAmount;                
                                  // reverse the direction of the fading at the ends of the fade:
                  if (brightness <= 0 || brightness >= 255) {
                    fadeAmount = -fadeAmount;
                  }
                                  // wait for 60 milliseconds to see the dimming effect
                  delay(60);
      
                                  //digitalWrite(led,HIGH);     // and turn on the LED
    }                        
    else
    {                        
      ledflag=0;                  // make status flag LOW
      //digitalWrite(led,LOW);    // and turn off the LED
    }
    }
  //delay(1000);                  // wait a sec for the 
                                  // hardware to stabilize
}                                 // begin again