Global - local variables

[deanhystad]

You do not return anything from nuseryControlFunction if nuserySWdatabase == 0 and nersFlag. Functions that return values need to always return a values.

[Motorhomer14]

Yes forgot the return had nothing if not going through IF statements. Change to below code which at present seems to be working ok. Probable not best way to get this done but seems to be working :).

Thanks for the link, this is really useful

import datetime

nersFlag = False
nuserySWdatabase = 0
nersOffTime = 0

def nuseryControlFunction(nuserySWdatabase, nersFlag, nersOffTime):
    if nuserySWdatabase == 0 and not nersFlag:
        print ("pump on")
      #  GPIO.output(pump, GPIO.LOW)
        nersOffTime = datetime.datetime.now() + datetime.timedelta(seconds=30)
        print (nersOffTime)
        print (now)
        nersFlag = True
    if nuserySWdatabase == 1:
        print ("pump off")
      #  GPIO.output(pump, GPIO.HIGH)
        nersOffTime = 0
        nersFlag = False
    if nersOffTime < now:
        print "shutdown"
    return nersFlag, nersOffTime

while True:
    now = datetime.datetime.now()
    nersFlag, nersOffTime = nuseryControlFunction(nuserySWdatabase, nersFlag, nersOffTime)