ブザーの使い方

1// ─────────────────────────────────────────
2//   BlueGrays · bluegrays.com
3//   Using a Buzzer
4// ─────────────────────────────────────────
5// The buzzer beeps at 400 Hz for 0.3 s, stays silent for 0.3 s and keeps
6// repeating. Shows how to use tone() and noTone().
7//
8// Pins:
9//   D7 -> Buzzer + (other leg to GND)
10
11int frequency = 400;   // Tone frequency (Hz)
12int buzzerPin = 7;     // Buzzer output pin
13
14void setup() {
15  // tone() sets the pin as an output itself
16}
17
18void loop() {
19  tone(buzzerPin, frequency);   // Start the 400 Hz tone
20  delay(300);
21  noTone(buzzerPin);            // Stop the sound
22  delay(300);
23}
24