/* Arduinoga LED chirog‘I va Button ulang. Button bosilganida LED raqamli signal 
bilan o‘chib yonsin, qo‘yib yuborilganida analog o‘chib yonsin, ya’ni yorqinlashib 
boorish bilan yonib, xiralashish bilan o‘chsin*/
void setup() {
  // put your setup code here, to run once:
 
pinMode(4, INPUT);
pinMode(9, OUTPUT);
}
bool f=false;
void loop() {
  // put your main code here, to run repeatedly:
  int b=digitalRead(4);
  if(b==1  ){
      digitalWrite(9,1);delay(400);
      digitalWrite(9,0);delay(400);
    }
  if(b==0){
   
    for(int i=0;i<=255;i+=5){
     
     
      analogWrite(9,i);
      delay(20);
    }
  
   
  }
  if(b==0){
    for(int i=255;i>=0;i-=5){
     
      analogWrite(9,i);
      delay(20);
    }
    delay(500);
  }


}