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Buzzer

Eliobot buzzer


Le buzzer d'Eliobot est un buzzer passif, il peut donc émettre des sons sur une grande plage de fréquence un peu comme les vieux téléphones.

Use with Elioblocs​

To use Eliobot's buzzer on Elioblocs, we use blocks from the catégorie son category to play a sound.

Using with Python​

To play notes in Python, we use the IO17 pin as a PWM output to be able to reproduce the desired frequency.

To play music, simply repeat the desired frequencies like in a score.

Elioblocs example​

exemple buzzer elioblocs

Here, we play the note Do for 1 second and start again infinitely.

Python Example​

With the library elio.py​

import board
import pwmio
from elio import Buzzer

buzzer_pin = pwmio.PWMOut(board.IO17, variable_frequency=True)
buzzer = Buzzer(buzzer_pin)

NOTES = {
    "Do": 262,
    "silence": 0.1,
}

while True:
    buzzer.play_note("Do", 1, NOTES, 80)  # Joue Do pendant 1 seconde
    buzzer.play_note("silence", 1, NOTES, 0)  # Pause d'1 seconde

Here, we play the note Do for 1 second and start again infinitely.

Without the library elio.py​

import board
import pwmio
import time

buzzer = pwmio.PWMOut(board.IO17, variable_frequency=True)

while True:
    buzzer.frequency = 262       # Fréquence de la note Do
    buzzer.duty_cycle = 32768    # 50% duty cycle pour émettre le son
    time.sleep(1)
    buzzer.duty_cycle = 0        # Arrête le son
    time.sleep(1)

Same principle, but directly controlling the frequency and duty cycle of the PWM.