Raspberry PI Sense HAT: Come pubblicare i dati su CloudAMQP via MQTT

publish_sense_hat_telemetry.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

try:
    from sense_hat import SenseHat
except ImportError:
    from sense_emu import SenseHat

import paho.mqtt.client as paho
import time
import datetime
import json
import socket
import signal
import sys
import uuid

__author__ = "Antonio Musarra <antonio.musarra@gmail.com>"
__copyright__ = "Copyright 2018 Antonio Musarra's Blog"
__version__ = "1.0.0"
__license__ = "MIT"

sleepTime = 5
deviceId = socket.gethostname() + "-" + str(uuid.uuid4())

sense = SenseHat()
sense.set_rotation(180)

red = (255, 0, 0)


# Return Sense temperature
def get_sense_temperature():
    return sense.temp


# Return Sens Pressure
def get_sense_pressure():
    return sense.pressure


# Return Sense Humidity
def get_sense_humidity():
    return sense.humidity


# Callback methods
def on_publish(client, userdata, mid):
    print("Data published (Mid: %s)" % mid)
    sense.show_message("Data published", text_colour=red)


def on_log(client, userdata, level, buf):
    print(buf)


def on_connect(client, userdata, flags, rc):
    if rc == 0:
        print("Connected to MQTT broker (RC: %s)" % rc)
    else:
        print("Connection to MQTT broker failed (RC: %s)" % rc)


def on_disconnect(client, userdata, rc):
    if rc != 0:
        print("Unexpected disconnect")
    else:
        print("Disconnected from MQTT broker")


def disconnect(signum, frame):
    """
    Signal handler to ensure we disconnect cleanly
    in the event of a SIGTERM or SIGINT.
    """
    client.loop_stop()
    client.disconnect()

    print("Exiting on signal %s" % signum)
    sys.exit(signum)


client = paho.Client(deviceId)
client.username_pw_set(
    "mygcwrqi:mygcwrqi",
    password="qd2vevNTwprtOj_fwyb5LnL90nDxNmw3")

# Register callbacks
client.on_connect = on_connect
client.on_disconnect = on_disconnect
client.on_log = on_log
client.on_publish = on_publish

# Connect to MQTT broker
client.connect("whale.rmq.cloudamqp.com", 1883)
client.loop_start()

# use the signal module to handle signals
signal.signal(signal.SIGTERM, disconnect)
signal.signal(signal.SIGINT, disconnect)

# Collect telemetry information from Sense HAT and publish to
# MQTT broker in JSON format
while True:
    temperature = get_sense_temperature()
    pressure = get_sense_pressure()
    humidity = get_sense_humidity()

    telemetryData = dict(DeviceId=deviceId,
                         Timestamp=datetime.datetime.utcnow().strftime('%Y-%m-%d %H:%M:%S.%f')[:-3],
                         Temperature=str(temperature),
                         Pressure=str(pressure),
                         Humidity=str(humidity)
                         )

    telemetryDataJson = json.dumps(telemetryData)

    (rc, mid) = client.publish(
        "RPi.Data",
        telemetryDataJson, qos=1)

    time.sleep(sleepTime)

sense_hat_display.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

try:
    from sense_hat import SenseHat
except ImportError:
    from sense_emu import SenseHat

sense = SenseHat()
sense.show_message("Benvenuto su https://www.dontesta.it")

sense_hat_read_sensors_data.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

try:
    from sense_hat import SenseHat
except ImportError:
    from sense_emu import SenseHat

sense = SenseHat()

while True:
    temperature = sense.get_temperature()
    pressure = sense.get_pressure()
    humidity = sense.get_humidity()
    sense.show_message(
        "The temperaturen is %d, the pressure is %d, and the humidity is %d." % (temperature, pressure, humidity))