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[FILE BEGIN]
1const int buzzer = 8;
2
3String cmd = "";
4
5void setup() {
6  pinMode(buzzer, OUTPUT);
7  Serial.begin(115200);
8}
9
10void loop() {
11  while (Serial.available()) {
12    char c = Serial.read();
13
14    if (c == '\n') {
15      process(cmd);
16      cmd = "";
17    } else if (c != '\r') {
18      cmd += c;
19    }
20  }
21}
22
23void process(String s) {
24
25  if (s.length() == 0) return;
26
27  if (s[0] == 'd') {
28    int ms = s.substring(1).toInt();
29    delay(ms);
30    return;
31  }
32
33  int freq = s.toInt();
34
35  if (freq <= 0)
36    noTone(buzzer);
37  else
38    tone(buzzer, freq);
39}
[FILE END]
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