Internet of Things + RaspberryPi + Python con carriots

Código de ejemplo de la Charla-Taller: Internet de las Cosas, RaspberryPi y Python en MediaLab-Prado (http://medialab-prado.es/article/iotraspberrypipython

Toda la información sobre este proyecto puedes encontrarla en https://www.carriots.com/tutorials/arduino_carriots/alert_system

#-*-coding:utf8-*-
import RPi.GPIO as GPIO, time
import urllib2
import time, datetime
import json

class Client(object):
    api_url = 'http://api.carriots.com/streams'

    def __init__ (self, api_key = None, client_type = 'json'):
        self.client_type = client_type
        self.api_key = api_key
        self.content_type = 'application/vnd.carriots.api.v2+%s' % (self.client_type)
        self.headers = {'User-Agent': 'Raspberry-Carriots',
                        'Content-Type': self.content_type,
                        'Accept': self.content_type,
                        'Carriots.apikey': self.api_key}

    def send (self, data):
        self.data = json.dumps(data)
        request = urllib2.Request(Client.api_url, self.data, self.headers)
        self.response = urllib2.urlopen(request)
        return self.response

def RCtime(PiPin):
    measurement = 0
    GPIO.setup(PiPin, GPIO.OUT)
    GPIO.output(PiPin, GPIO.LOW)
    time.sleep(0.1)

    GPIO.setup(PiPin, GPIO.IN)

    while (GPIO.input(PiPin) == GPIO.LOW):
        measurement += 1

    return measurement

def main():
    GPIO.setmode(GPIO.BCM)
    ON = 1
    OFF = 2
    DEVICE = 'YOUR_DEVICE@YOUR_USERNAME'
    APIKEY = 'YOUR_APIKEY'
    lights=OFF

    client_carriots = Client (APIKEY)

    while True:
        timestamp = int (time.mktime(datetime.datetime.utcnow().timetuple()))
        if RCtime(4) > 600:
            new_lights = OFF
        else:
            new_lights = ON

        if lights is not new_lights
            lights = new_lights
            data = {'protocol':'v2','device':DEVICE,'at':timestamp,'data':{'light':('ON' if new_lights is ON else 'OFF')}}
            carriots_response=client_carriots.send(data)

if __name__ == '__main__':
    main()