Project 4: Muziek afspelen

Beschrijving

There is a audio power amplifier element in the car expansion board, which is as an external amplification equipment to play music.

In this project, we will work to play a piece of music by using it.

Componentkennis

Passieve zoemer:

De audioversterker (zoals een passieve zoemer) heeft geen interne oscillator. Bij aansturing moeten we vierkante golven met verschillende frequenties naar de positieve pool van het component sturen en de negatieve pool naar massa verbinden, zodat de versterker tonen met verschillende frequenties produceert.

Besturingspin

Passieve zoemer	25
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Project 4.1 Speel Happy Birthday

Testcode

from machine import Pin, PWM
from time import sleep
buzzer = PWM(Pin(25))

buzzer.duty(1000)

# Happy birthday
buzzer.freq(294)
sleep(0.25)
buzzer.freq(440)
sleep(0.25)
buzzer.freq(392)
sleep(0.25)
buzzer.freq(532)
sleep(0.25)
buzzer.freq(494)
sleep(0.25)
buzzer.freq(392)
sleep(0.25)
buzzer.freq(440)
sleep(0.25)
buzzer.freq(392)
sleep(0.25)
buzzer.freq(587)
sleep(0.25)
buzzer.freq(532)
sleep(0.25)
buzzer.freq(392)
sleep(0.25)
buzzer.freq(784)
sleep(0.25)
buzzer.freq(659)
sleep(0.25)
buzzer.freq(532)
sleep(0.25)
buzzer.freq(494)
sleep(0.25)
buzzer.freq(440)
sleep(0.25)
buzzer.freq(698)
sleep(0.25)
buzzer.freq(659)
sleep(0.25)
buzzer.freq(532)
sleep(0.25)
buzzer.freq(587)
sleep(0.25)
buzzer.freq(532)
sleep(0.5)
buzzer.duty(0)

Testresultaat

De passieve zoemer zal ‘Happy Birthday’ afspelen.