int buttonPin1=2;
int buttonPin2=3;
int buttonVal1;
int buttonVal2;
int LEDPin=5;
int buzzPin=4;
int LEDbright=0;
int DT=1000;
int pitch;
void setup() {
  // put your setup code here, to run once:
pinMode(buttonPin1, INPUT);
pinMode(buttonPin2, INPUT);
pinMode(LEDPin, OUTPUT);
pinMode(buzzPin, OUTPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  tone(8, 262, 250);
buttonVal1=digitalRead(buttonPin1);
buttonVal2=digitalRead(buttonPin2);
Serial.print("Button 1=");
Serial.print(buttonVal1);
Serial.print(",");
Serial.print("Button2=");
Serial.println(buttonVal2);
delay(DT);
if (buttonVal1==0){
LEDbright=LEDbright+5;
}
if(buttonVal2==0){
LEDbright=LEDbright-5;
}
Serial.println(LEDbright);
if(LEDbright>=255){
LEDbright=255;
digitalWrite(buzzPin, HIGH);
delay(DT);
digitalWrite(buzzPin, LOW);
}
if(LEDbright<=0){
LEDbright=0;
digitalWrite(buzzPin, HIGH);
delay(DT);
digitalWrite(buzzPin, LOW);
}
{
analogWrite(LEDPin, LEDbright);
}
}