GoogleAsstOffOn.py

# 
# References:
# - https://learn.adafruit.com/welcome-to-adafruit-io/client-library
# - https://github.com/adafruit/Adafruit_IO_Python/blob/master/examples/basics/subscribe.py
# 
# Hardware
# - Raspberry Pi 4 Model B
#   [2GB] https://my.cytron.io/p-raspberry-pi-4-model-b-2gb?tracking=idris
#   [4GB] https://my.cytron.io/p-raspberry-pi-4-model-b-4gb?tracking=idris
#   [8GB] https://my.cytron.io/p-raspberry-pi-4-model-b-8gb-latest?tracking=idris
# - Grove Base Kit for Raspberry Pi
#   https://my.cytron.io/p-grove-base-kit-for-raspberry-pi?tracking=idris
# 
# Install
# - sudo pip3 install adafruit-blinka
# - sudo pip3 install adafruit-io
# 
# Update:
# 28 Feb 2021
# 

# Import standard python modules.
import sys

# Import blinka python modules.
import board
import digitalio

# This example uses the MQTTClient instead of the REST client
from Adafruit_IO import MQTTClient

# Set to your Adafruit IO key.
# Remember, your key is a secret,
# so make sure not to publish it when you publish this code!
ADAFRUIT_IO_KEY = 'YOUR_AIO_KEY'

# Set to your Adafruit IO username.
# (go to https://accounts.adafruit.com to find your username)
ADAFRUIT_IO_USERNAME = 'YOUR_AIO_USERNAME'

# Set to the ID of the feed to subscribe to for updates.
FEED_ID = 'digital'

relay = digitalio.DigitalInOut(board.D5)
relay.direction = digitalio.Direction.OUTPUT

# Define callback functions which will be called when certain events happen.
def connected(client):
    """Connected function will be called when the client is connected to
    Adafruit IO.This is a good place to subscribe to feed changes.  The client
    parameter passed to this function is the Adafruit IO MQTT client so you
    can make calls against it easily.
    """
    # Subscribe to changes on a feed named Counter.
    print('Subscribing to Feed {0}'.format(FEED_ID))
    client.subscribe(FEED_ID)
    print('Waiting for feed data...')

def disconnected(client):
    """Disconnected function will be called when the client disconnects."""
    sys.exit(1)

def message(client, feed_id, payload):
    """Message function will be called when a subscribed feed has a new value.
    The feed_id parameter identifies the feed, and the payload parameter has
    the new value.
    """
    print('Feed {0} received new value: {1}'.format(feed_id, payload))
    
    if payload == "OFF":
        print("Turn off relay!")
        relay.value = False
    elif payload == "ON":
        print("Turn on relay!")
        relay.value = True

# Create an MQTT client instance.
client = MQTTClient(ADAFRUIT_IO_USERNAME, ADAFRUIT_IO_KEY)

# Setup the callback functions defined above.
client.on_connect = connected
client.on_disconnect = disconnected
client.on_message = message

# Connect to the Adafruit IO server.
client.connect()

# The first option is to run a thread in the background so you can continue
# doing things in your program.
client.loop_blocking()