#!/usr/bin/python

# Documentation:
# http://abyz.me.uk/rpi/pigpio/python.html

# start the pigpiod with:
#   systemctl enable pigpiod
#   systemctl start pigpiod

import  pigpio
import  time

GPIO_NO = 4

def gpio_callback(gpio, level, tick):
    print("gpio %d is %d , %d" % (gpio, level, tick))


def callback_method(pig, gpio_no):
    pig.set_mode(gpio_no, pigpio.INPUT)   # make GPIO an input
    pig.set_glitch_filter(gpio_no, 10000)   # debounce 10 msec

    # set up a callback for the GPIO
    cb1 = pig.callback(gpio_no, pigpio.EITHER_EDGE, gpio_callback)

    # read initial state of the GPIO
    gp = pig.read(gpio_no)
    print ("initial: gpio %d is %d" % (gpio_no, gp))

    time.sleep(30)

    # cancel the callback
    cb1.cancel()

def polling_method(pig, gpio_no):
    # Polling method. Read every 1 second for 10 seconds.
    pig.set_mode(gpio_no, pigpio.INPUT)   # make GPIO an input
    for i in range(10):
        gp = pig.read(gpio_no)
        print ("gpio %d is %d" % (gpio_no, gp))
        time.sleep(1)

def main():
    pig = pigpio.pi()   # local gpios
    callback_method(pig, GPIO_NO)
    polling_method(pig, GPIO_NO)

if __name__ == "__main__":
    main()