from machine import Pin
from time import sleep

relay1 = Pin(19, Pin.OUT)
relay2 = Pin(18, Pin.OUT)
relay3 = Pin(5, Pin.OUT)
relay4 = Pin(17, Pin.OUT)

bt1 = Pin(12, Pin.IN, Pin.PULL_UP)
bt2 = Pin(14, Pin.IN, Pin.PULL_UP)
bt3 = Pin(27, Pin.IN, Pin.PULL_UP)
bt4 = Pin(26, Pin.IN, Pin.PULL_UP)

while True:
    if bt1.value() == 0:
        relay1.value( not relay1.value())
        while bt1.value() == 0:
            sleep(0.1)
    elif bt2.value() == 0:
        relay2.value( not relay2.value())
        while bt2.value() == 0:
            sleep(0.1)
    elif bt3.value() == 0:
        relay3.value( not relay3.value())
        while bt3.value() == 0:
            sleep(0.1)
    elif bt4.value() == 0:
        relay4.value( not relay4.value())
        while bt1.value() == 0:
            sleep(0.1)
    sleep(0.1)