Raspberry Pi- GPIO Events in Python

Question

I am using the GPIO pins on my Raspberry Pi with a PIR sensor to detect motion. When the sensor detects motion I want to then move the software onto other functions.

Answer 1

kapcom01 gives some great ideas but it's better to make not make a lot of instructions in the a interrupt.

Usually you put a flag to 1 when the callback is call and you make the processing in the main function. In thes manner there is no risk of freesing the programm.

Somethings like this :

     from time import sleep
     import RPi.GPIO as GPIO



     def init():
         # make all your initialization here
         flag_callback = False
         # add an interrupt on pin number 7 on rising edge
         GPIO.add_event_detect(7, GPIO.RISING, callback=my_callback, bouncetime=300)


     def my_callback():
         # callback = function which call when a signal rising edge on pin 7
         flag_callback = True


     def process_callback():
         # TODO: make process here
         print('something')


     if __name__ == '__main__':
     # your main function here

     # 1- first call init function
     init()

     # 2- looping infinitely 
     while True:
         #3- test if a callback happen
         if flag_callback is True:
             #4- call a particular function
             process_callback()
             #5- reset flagfor next interrupt
             flag_callback = False
    pass