import time
from machine import Pin

button_pressed_count= 0 # une variable globale
pin_button = Pin(21, mode=Pin.IN, pull=Pin.PULL_UP)
start = time.ticks_ms()
def button_isr(lambd):
    global button_pressed_count
    global start
    button_pressed_count += 1
    #delta = time.ticks_diff(time.ticks_ms(),start)
    #if delta > 100 :
        #button_pressed_count += 1
        #start = time.ticks_ms()

if __name__ == "__main__":
    button_pressed_count_old = 0
    pin_button.irq(trigger=Pin.IRQ_FALLING,handler=button_isr)

    while True:
        if button_pressed_count_old != button_pressed_count:
           print('Button value:', button_pressed_count)
           button_pressed_count_old = button_pressed_count