def setup(threshold=25):
lux = SensorPub(LuxSensor())
lux.subscribe(print)
lux.csv_writer(os.path.expanduser('~/lux.csv'))
led = GpioPinOut()
actions = lux.map(lambda event: event.val > threshold)
actions.subscribe(led)
actions.subscribe(lambda v: print('ON' if v else 'OFF'))
lux.print_downstream()
return (lux, led)
if self.events_since_last == self.period:
val = median(self.samples)
event = SensorEvent(sensor_id=v.sensor_id, ts=v.ts, val=val)
self.events_since_last = 0
return event
else:
self.last_event = v # save in case we complete before completing a period
return None
def complete(self):
if self.events_since_last > 0:
# if we have some partial state, we emit one final event that
# averages whatever we saw since the last emission.
return SensorEvent(sensor_id=self.last_event.sensor_id,
ts=self.last_event.ts,
val=median(
self.samples[0:self.events_since_last]))
SENSOR_ID = 'sensor-1'
scheduler = Scheduler(asyncio.get_event_loop())
sensor = SensorPub(
RandomSensor(SENSOR_ID, mean=10, stddev=5, stop_after_events=12))
sensor.csv_writer('raw_data.csv').subscribe(
lambda x: print("raw data: %s" % repr(x)))
sensor.transduce(PeriodicMedianTransducer()).mqtt_async_send(
URL, SENSOR_ID, scheduler).output()
scheduler.schedule_periodic(sensor, 0.5)
scheduler.run_forever()
print("that's all folks")