# 3-Key Piano
import time
from machine import Pin, PWM

# Construct PWM object, with LED on Pin(25)
Spkr = PWM(Pin(18))
B0 = Pin(20, Pin.IN, Pin.PULL_UP)
B1 = Pin(21, Pin.IN, Pin.PULL_UP)
B2 = Pin(22, Pin.IN, Pin.PULL_UP)

while(1):
    if(B0.value() == 0):
        Spkr.freq(220)
        Spkr.duty_u16(32768)
        while(B0.value() == 0):
            pass
    if(B1.value() == 0):
        Spkr.freq(250)
        Spkr.duty_u16(32768)
        while(B1.value() == 0):
            pass
    if(B2.value() == 0):
        Spkr.freq(280)
        Spkr.duty_u16(32768)
        while(B2.value() == 0):
            pass
    pwm.duty_u16(0)