const int c = 261;
const int d = 294;
const int buzzerPin = 8;

void setup()
{
  pinMode(buzzerPin, OUTPUT);
}
 
void loop()
{
  test();
  delay(1000);
}
 
void beep(int note, int duration)
{
  tone(buzzerPin, note, duration);

}
 
void test()
{
  beep(c, 500); 
  delay(1000); 
  beep(d,500); 
}