Smart Trash Can Demo

trashcan-client.py

def distanceMeasurement():
	prev_distance = 0
	while 1:
		ultrasonicSensor_init()
		time.sleep(2)		
		GPIO.output(TRIG, True)
		time.sleep(0.00001)
		GPIO.output(TRIG, False)
		#Starts the timer 
		while GPIO.input(ECHO)==0:
			pulse_start = time.time()
		#Waits for the timer to end once the pin is high
		while GPIO.input(ECHO)==1:
			pulse_end = time.time()

		pulse_duration = pulse_end - pulse_start

		distance = pulse_duration * 17150

		distance = round(distance, 2)

		if(prev_distance != distance and prev_distance > (distance+3) or prev_distance < (distance-3)):
			prev_distance = distance
			mqttc.publish("garbaseData", "{\"container\":\""+GARBAGE_ID+"\",\"level\":"+str(distance)+"}")
		print "Distance:",distance,"cm"
		GPIO.cleanup()

trashcan-server.py

def on_message(client, userdata, msg):
	message = dict()
	message = json.loads(msg.payload)  
	print pubnub.publish(channel="garbageApp-resp", message=message)