from machine import Pin
# Interrupt_Edge.py
# Use a falling-edge interrupt to count
# number of button pushes

interrupt_flag=0
N = 0

pin = Pin(15,Pin.IN,Pin.PULL_UP)
def callback(pin):
    global interrupt_flag
    global N
    interrupt_flag=1
    N = N + 1

# options are RISING, FALLING, LOW_LEVEL, HIGH_LEVEL
pin.irq(trigger=Pin.IRQ_FALLING, handler=callback)
while True:
    if interrupt_flag is 1:
        print("Interrupt # ", N)
        interrupt_flag=0