tvonoff.py

#!/usr/bin/env python
#
# tvonoff.py
# This script uses a Pir sensor and a IR diode to turn on a tv when motion is detected.
# It uses time to only turn on tv at daytime. 
# It also has a time out, if no motion is detected for a set period the tv is turned off.
# Another function is to send Mqtt messages when tv is turned on or off.
#
# The software irsend from Lirc is used to send codes. 
# /usr/bin/irsend SEND_ONCE Samsung_BN59-00685A KEY_POWER

from time import time, sleep
import datetime
import os	# For running external commands
import RPi.GPIO as GPIO
import paho.mqtt.client as paho
import urlparse

# Mqtt 
mqttc = paho.Client()
url_str = 'mqtt://192.168.1.79:1883'
url = urlparse.urlparse(url_str)
mqttc.username_pw_set("emonpi", "pass")

# Setup Gpio
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BOARD)
GPIO.setup(13, GPIO.IN)         #Output from PIR motion sensor connected to pin 13

hour=0

def sendmqtt(mess):
    #print "Send mqtt"
    now = datetime.datetime.now()
    mqttc.connect(url.hostname, url.port)
    mqttc.publish("pir/hallway", str(now) + mess)

def printtime():
	# Current time
	global hour
	now = datetime.datetime.now()
	hour = str(now.hour)
	min = str(now.minute)
	print "Time now: " + hour + ":" + min

# time()
# Return the time in seconds since the epoch as a floating point number.
starttime = int(round(time() * 1000))	# Store start time
print "Starttime:"
print starttime

sendmqtt("Tvonoff started")

tvstatus="on"

printtime()

while True:
	i=GPIO.input(13)
	if i==0:                 #When output from motion sensor is LOW, no movement
		timenow = int(round(time() * 1000))

		if timenow - starttime > 1000000:	# 100000 millis * 60 = 10 minutes
			printtime()
			print "Time out, set tv off (if on)"
			if tvstatus=="on":
				# Tv off
				os.system('/usr/bin/irsend SEND_ONCE -#3 Samsung_BN59-00685A KEY_POWER')
				tvstatus="off"
				print "Tv off"
                                sendmqtt("Tv off")
			starttime = timenow	# Reset counter
			
		
	elif i==1:               #When output from motion sensor is HIGH, movement detected
		printtime()
		#print hour
		print "Movement detected",i
		print "Tv status: " + tvstatus
		timenow = int(round(time() * 1000))
		print timenow - starttime
		if tvstatus=="off":
			print "Movement and tv is off"
			# Check if its daytime, ie ok to turn on tv
			print "Hour now: ", hour
			print type(hour)
			if int(hour)>7 and int(hour) < 21:
                            # Turn tv on and change status
                            print "Tv turns on";
                            os.system('/usr/bin/irsend SEND_ONCE -#3 Samsung_BN59-00685A KEY_POWER')
                            tvstatus="on"
                            print "Tv on"
                            sendmqtt("Tv on")
		# Reset timer
		starttime = int(round(time() * 1000))
	#print tvstatus		# For debug
	sleep(1)