from machine import Pin
import time


buttons = [
    Pin(18, Pin.IN, Pin.PULL_DOWN),
    Pin(17, Pin.IN, Pin.PULL_DOWN),
    Pin(16, Pin.IN, Pin.PULL_DOWN),
]


def button_handler(pin):
    if pin == buttons[0]:
        print(time.ticks_us(), "0")
    elif pin == buttons[1]:
        print(time.ticks_us(), "1")
    elif pin == buttons[2]:
        print(time.ticks_us(), "2")


for button in buttons:
    button.irq(button_handler, Pin.IRQ_RISING)