buzzer-melodie.ino
A rising then falling scale plays on a passive buzzer through tone(). The melody lives in flash (PROGMEM + pgm_read_near_int), a healthy habit that keeps RAM free for audio or sensor processing.
Hardware
A Teensy 4.0 (NXP i.MX RT1062, Cortex-M7 @ 600 MHz, 3.3 V logic) powered over USB. 1 passive buzzer 3.3-5 V.
Wiring
Buzzer between pin 16 and GND. On Teensy, tone() works on nearly every pin without timer conflicts.
How it works
tone(pin, frequency, duration) sets an audio PWM; reading the table from flash spares RAM. A 0 entry in the table marks a rest.
Running it
With Teensyduino in the Arduino IDE, select « Teensy 4.0 », Upload then confirm in the Teensy Loader. Pins are 3.3 V; the 4.0 is pin-compatible with the 3.2.
Variants
Move to the Teensy Audio library to mix several sound voices, or play a melody received over USB MIDI.
buzzer-melodie.ino
// Melodie sur buzzer passif : tone() + table de notes en flash.
const int BUZZER = 16;
const int MELODIE[] PROGMEM = {
523, 587, 659, 698, 784, 880, 988, 1046, // gamme montante (Hz)
1046, 988, 880, 784, 698, 659, 587, 523, // gamme descendante
0 // 0 = silence
};
void setup() {
Serial.begin(9600);
Serial.println(F("Melodie Teensy"));
}
void loop() {
int n = sizeof(MELODIE) / sizeof(MELODIE[0]);
for (int i = 0; i < n; i++) {
int f = pgm_read_near_int(&MELODIE[i]); // lecture depuis la flash
if (f == 0) {
noTone(BUZZER);
delay(300);
} else {
tone(BUZZER, f, 180); // 180 ms par note
delay(200);
}
}
delay(2000);
}
// Sur Teensy, tone() fonctionne sur a peu pres toutes les broches
// et ne gene pas les autres timers (contrairement aux AVR).