doorstatus/source/server/watchdoor.py

#!/usr/bin/env python
#coding: utf8 

# file: watchdoor.py
# date: 06.09.2020
# mail: berhsi@web.de
# desc: deamon who deals with edge detection at pin 18

import logging
loglevel = logging.INFO
formatstring = '%(asctime)s: %(levelname)s: %(message)s'
logging.basicConfig(format=formatstring, level=loglevel)
import time
import RPi.GPIO as GPIO
try:
    from setstatus import SetStatus
except Exception as e:
    logging.error('Cant import module setstatus')
    logging.error('Error: {}'.format(e))


GPIO.setmode(GPIO.BOARD)                              # kind of enumeration
GPIO.setup(18, GPIO.IN, pull_up_down = GPIO.PUD_DOWN) # pin 18 (GPIO 24)
channel = 18

def voltage_changed(channel):
    '''
    callback-function
    '''
    if GPIO.input(channel) == GPIO.HIGH:
        # door closed -> pin hight
        logging.info('Pin high triggered - Space closed')
        s = SetStatus()
        s.run(0)
    else:
        # door open -> pin low
        logging.info('Pin low triggered - Space is open')
        s = SetStatus()
        s.run(1)

def main():
    '''
    '''
    logging.info('watchdoor.py started')
    GPIO.add_event_detect(channel,
                          GPIO.BOTH,
                          callback = voltage_changed,
                          bouncetime = 200)
    while 1:
        time.sleep(0.1)


if __name__ == '__main__':
    main()