[Solved] crontab job - Witty Pi board not connected

Hello,

I have written a python script which enables / disable a schedule script, depending on an external Pin. If the Pin is not set, then the schedule script isn't activated an the rasperry pi stays on.

When I start this script in the terminal, everything works fine 

python /home/pi/Python_Projects/NLR/gpio_test.py 

I want to start this script after reboot via crontab:

@reboot sleep 60 && cd /home/pi && python Python_Projects/NLR/gpio_test.py >> /home/pi/output_file.txt 2>&1

I get the following Error:

Start gpio_test.py
LOG_MODE =  True
Activate WittiPy Module
================================================================================

|                                                                              |

|   Witty Pi - Realtime Clock + Power Management for Raspberry Pi              |

|                                                                              |

|            < Version 4.13 >     by Dun Cat B.V. (UUGear)                     |

|                                                                              |

================================================================================



Seems Witty Pi board is not connected? Quitting...

I also added a 60seconds sleep after reboot but it didn't make a difference. Maybe can you help me?

My script looks like this:

import RPi.GPIO as GPIO
import os
import subprocess
import time
import re

log_mode_switch = 26
wittipycmd = '/home/pi/wittypi/wittyPi.sh'

def get_log_mode():
    GPIO.setmode(GPIO.BOARD)
    GPIO.setup(log_mode_switch, GPIO.IN)
    return not GPIO.input(log_mode_switch)

def set_wittipy_module(enable=False):
    p = subprocess.Popen(wittipycmd,
                         stdout=subprocess.PIPE,
                         stdin=subprocess.PIPE,
                         stderr=subprocess.PIPE,
                         shell=True,
                         bufsize=0)
    if enable:
        print('Activate WittiPy Module')
        # activate script
        scriptnum = 4
        options = '6 \n '+str(scriptnum)+' \n 13 \n' 
    else:
        print('Disable WittiPy Module')
        # disable script + startup timers
        options = '12 \n 1 \n  12 \n 2 \n  12 \n 3 \n  13 \n'
    p.stdin.write(options.encode())
    out = p.stdout.readline().decode('utf-8')
    while out:
        print(out)
        out = p.stdout.readline().decode('utf-8')



if __name__ == '__main__':

    log_mode = get_log_mode()
    print('LOG_MODE = ', log_mode)

    if log_mode:
        set_wittipy_module(enable=True)
    else:
        set_wittipy_module(enable=False)