sensorCode.py

#import section
import RPi.GPIO as GPIO                         #imports GPIO library to read motion sensor
import time                                     #imports time library to be able to set up timer
import os                                       #imports os library so program can run bash commands

#Variable declaration

#state variables
sensorState = 0                                 #sets sensor state to default of off
monitorState = 1                                #sets monitor state to default of on

#time variables
waitWhileOn = 1200                              #sets turn off delay to 20 minutes (1200 seconds)
waitWhileOff = 10                               #sets turn on delay to 10 seconds
waitTime = waitWhileOn                          #sets wait time to  off delay
lastTime = ""                                   #sets time tracker to "".  This is used to consolidate  timer count when program is run from command line

#GPIO variables
pirInput = 4                                    #sets signal pin for sensor
GPIO.setwarnings(False)                         #turns  warnings off
GPIO.setmode(GPIO.BCM)                          #sets mode to BCM
GPIO.setup(pirInput, GPIO.IN, GPIO.PUD_DOWN)    #sets up GPIO input


#runs until stopped
while True:
        #Set these local variables every loop
        sensorState= GPIO.input(pirInput)
        startTime = time.time()
        #while loop only executes when sensor stat doesn't match monitor state
        while sensorState != monitorState:
                #keeps track of how long has lapsed
                lapsedTime = time.time()-startTime
                timeLeft = round(waitTime-lapsedTime)
                sensorState= GPIO.input(pirInput)
                #prints out new time in secondsif it has changes (10,9,8...)
                if(timeLeft != lastTime):
                        print("currently waiting for time to change, time left: " + str(timeLeft))
                        lastTime = timeLeft
                #only runs if declared wait time has passed
                if (lapsedTime > waitTime):
                        print("Changing State.")
                        #turns monitor on if it is off
                        if(monitorState == 0):
                                monitorState = 1
                                print("Turning monitor on")
                                os.system("sudo sh /home/pi/Calendar/rpi-hdmi.sh on")
                                waitTime = waitWhileOn
                        #turns monitor off if it is on
                        else:
                                monitorState = 0
                                print("Turning monitor off")
                                os.system("sudo sh /home/pi/Calendar/rpi-hdmi.sh off")
                                waitTime = waitWhileOff

        if (sensorState == monitorState):
                print("Matching States")