from machine import Pin,PWM 
from time import sleep
push1=Pin(23,Pin.IN,Pin.PULL_UP)
push2=Pin(21,Pin.IN,Pin.PULL_UP)
push3=Pin(5,Pin.IN,Pin.PULL_UP)
push4=Pin(2,Pin.IN,Pin.PULL_UP)
buzzer = PWM(Pin(14))
while True:
    state1=push1.value()
    state2=push2.value()
    state3=push3.value()
    state4=push4.value()
    if state1==False:
        buzzer.freq(100)
    elif state2==False:
        buzzer.freq(1000)
    elif state3==False:
        for i in range(100,1000,200):
            buzzer.freq(i)
            sleep(0.005)
    elif state4==False:
        for i in range(500,1000):
            buzzer.freq(i)
            sleep(0.005)
    else:
        buzzer.freq(1)