from machine import Pin, PWM
import time
from time import sleep_ms

class BUZZER:
    def __init__(self, sig_pin):
        self.pwm = PWM(Pin(sig_pin, Pin.OUT))
        
    def play(self, melodies, wait, duty):
        for note in melodies:
            if note == 0:
                self.pwm.duty(0)
            else:
                self.pwm.freq(note)
                self.pwm.duty(duty)
            sleep_ms(wait)
        self.pwm.duty(0)

#notes and its equivalent frequency
A4 = 400
CS5 = 550
E5 = 660
A5 = 880

pattern = [A4, CS5, E5, A5, A5, E5, CS5, A4]

b = BUZZER(23)
wait = 500
b.play(pattern, wait, 512)

btn1 = Pin(14, Pin.IN, Pin.PULL_UP) 

while True:
    if btn1.value() == 0:
        if wait==500:
            wait = 250
        else:
            wait = 500
            
        b.play(pattern, wait, 512)
    time.sleep_ms(100)