auxiliary.py

#!/usr/bin/env python
# Auxiliary functions, such as releasing GPIO

#-------------------------------------------------------------------------------
#### Imports ####

import time
import RPi.GPIO as gpio


#### Objects ####

#-------------------------------------------------------------------------------
class AuxiliaryHelp(object):
    # Make sure there is only one instance of AuxiliaryHelp

    _instances=[]

    # Initialize the object
    def __init__(self):
        if ( len(self._instances)>1 ):
            print("ERROR: One instance of AuxiliaryHelp is running already.")
            exit(1)
        self._instances.append(self)


#-------------------------------------------------------------------------------
    #clean up GPIO
    def cleanup (self):
        gpio.cleanup()

#-------------------------------------------------------------------------------
    #write a value to a log file
    def writetofile (self,label,value):
        logfile = 'logfile.txt'
        mystring = label+': '+str(value)+'\n'
        try:
            f=open(logfile, 'a')
            f.write(mystring)
            print('Wrote the following to '+logfile+':\n'+label+': '+str(value)+'\n')
            f.close()
        except IOError:
            print("cannot find file: " + logfile)
            exit()