void setup() {
  pinMode(1, OUTPUT);
  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
}
int daraja = 150;
void loop() {
  if(digitalRead(2)==1)
  {
     daraja+=10;
     if(daraja==250)
     {
      daraja=0;
     }
  }
  if(digitalRead(3)==1)
  {
    daraja-=10;
  }
  analogWrite(1,daraja);

}