Python • python alarm program, -resource issue?

Code:

#!/usr/bin/env python 3import RPi.GPIO as GPIOimport threadingimport timePIR_pin = 27AlarmAktiv_Switch = 18BuzzerOutput = 20   #These output are defined by RPI Relay Board HornOutput = 21     #These output are defined by RPI Relay BoardAlarm_Activated = 26 #These output are predefined by RPI Relay BoardGPIO.setwarnings(False)GPIO.setmode(GPIO.BCM)GPIO.setup(PIR_pin, GPIO.IN, GPIO.PUD_DOWN)GPIO.setup(AlarmAktiv_Switch, GPIO.IN)GPIO.setup(BuzzerOutput, GPIO.OUT, initial=GPIO.HIGH) #ensuring outout starts at lowGPIO.setup(HornOutput, GPIO.OUT, initial=GPIO.HIGH)   #ensuring outout starts at lowGPIO.setup(Alarm_Activated, GPIO.OUT, initial=GPIO.HIGH)   #ensuring outout starts at lowMovement = 0AlarmAktiv = 0         #Bool evtAlarm_Horn_Set = 0Alarm_Horn_Max_tid = 0def delay_Horn_function():   #Thread 1 (t1)    if  Alarm_Horn_Set ==1:        time.sleep(15)        if not GPIO.input(AlarmAktiv_Switch):             print ("Alarm horn")            GPIO.output(HornOutput, GPIO.LOW)            GPIO.output(BuzzerOutput, GPIO.HIGH)    #stop buzzer heredef delay_Horn_Max():        #Thread 2 (t2)    if  Alarm_Horn_Max_tid ==1:        time.sleep(900)             #Maybe set to: 15min (15*60=900 sec.)        print ("Alarm max tid")        GPIO.output(HornOutput, GPIO.HIGH)        GPIO.output(Alarm_Activated, GPIO.HIGH)   #turn off 12 VDC PS, og derved alarm aktiveret signal    if __name__ == "__main__":        while True:                if not GPIO.input(AlarmAktiv_Switch) and AlarmAktiv ==0:  #Here alarn is activated            time.sleep(7)            print ("Alarm Aktiveret")  #            AlarmAktiv = 1                 #Alarmen er aktiveret, efter en forsinkelse            GPIO.output(Alarm_Activated, GPIO.LOW)   #LOW actually trigger Reley "ON"(inverted)            time.sleep(10)   #Timedelay, from indication 'Alarm active', till actual active                                if AlarmAktiv ==1 and Movement ==0:                #Hvis alarmen er aktiveret            if GPIO.input(PIR_pin):        #PIR Input is monitored, -any activity?                Movement = 1              #Movement detected                GPIO.output(BuzzerOutput, GPIO.LOW)   #LOW actually trigger Reley "ON"(inverted)                print ("Movement detekteret")  #BuzzerOutput = 1                #Delay inden horn aktiveres        if  Movement == 1 and Alarm_Horn_Set ==0:            Alarm_Horn_Set =1            t1 = threading.Thread(target=delay_Horn_function, args=())            t1.start()                    #Max horn tid:        if  Alarm_Horn_Set ==1 and Alarm_Horn_Max_tid ==0:            Alarm_Horn_Max_tid =1            t2 = threading.Thread(target=delay_Horn_Max, args=())            t2.start()                             if GPIO.input(AlarmAktiv_Switch):  #Deaktiver og reset variabler:                AlarmAktiv = 0            Movement = 0  #            Alarm_Horn_Set = 0            Alarm_Horn_Max_tid = 0            GPIO.output(BuzzerOutput, GPIO.HIGH)            GPIO.output(HornOutput, GPIO.HIGH)            GPIO.output(Alarm_Activated, GPIO.HIGH)            #Evt else her, med nulstilling af alt            print ("Alarm deaktiveret")