[Tutor] counting function calls

[marcus lütolf]

Dear experts,
I have written the following code for motion detection with a PIR sensor
with a function and
I need to count how many times the funtion is called, but I get a traceback:

#!/usr/bin/python3
import sys, time
import RPi.GPIO as gpio

gpio.setmode(gpio.BOARD)
gpio.setup(23, gpio.IN)
count = 0
def mein_callback(pin):
    count += 1
    print('PIR 1 aktiviert', count)
    return

try:
    gpio.add_event_detect(23, gpio.RISING, callback = mein_callback)
    while True:
        time.sleep(2)
except KeyboardInterrupt:
    print('PIR deaktiviert')

PIR 1 aktiviert
Traceback (most recent call last):
  File "./PIRex.py", line 9, in mein_callback
    count += 1
UnboundLocalError: local variable 'count' referenced before assignment
^CPIR deaktiviert

Tanks for help, marcus.


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