from machine import PWM, Pin
import time
key = Pin(13, Pin.IN, Pin.PULL_UP)
key2 = Pin(12, Pin.IN, Pin.PULL_UP)
key3 = Pin(14, Pin.IN, Pin.PULL_UP)
key4 = Pin(27, Pin.IN, Pin.PULL_UP)
key5 = Pin(26, Pin.IN, Pin.PULL_UP)
key6 = Pin(25, Pin.IN, Pin.PULL_UP)
key7 = Pin(33, Pin.IN, Pin.PULL_UP)

while True:
    if key.value() == 0:
        beep = PWM(Pin(22), freq=441, duty=128)
        time.sleep(0.5)
        beep.deinit()
    elif key2.value() == 0:
        beep = PWM(Pin(22), freq=495, duty=128)
        time.sleep(0.5)
        beep.deinit()
    elif key3.value() == 0:
        beep = PWM(Pin(22), freq=556, duty=128)
        time.sleep(0.5)
        beep.deinit()
    elif key4.value() == 0:
        beep = PWM(Pin(22), freq=589, duty=128)
        time.sleep(0.5)
        beep.deinit()
    elif key5.value() == 0:
        beep = PWM(Pin(22), freq=661, duty=128)
        time.sleep(0.5)
        beep.deinit()
    elif key6.value() == 0:
        beep = PWM(Pin(22), freq=742, duty=128)
        time.sleep(0.5)
        beep.deinit()
    elif key7.value() == 0:
        beep = PWM(Pin(22), freq=833, duty=128)
        time.sleep(0.5)
        beep.deinit()
    else:
        pass