/*

*/
const int speakerPin = 7;
int frequencies[8] = {262, 294, 330, 349, 392, 440, 494, 523};
int testFrequencies[20] = {50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, 650, 700, 750, 800, 850, 900, 950, 1000};

void setup() {
    pinMode(speakerPin, OUTPUT);
}

void loop() {
    for (int i = 0; i < 20; i++) {
      tone(speakerPin, testFrequencies[i], 200);
      delay(200);
    }
}