Overview
Things
Story

Procedure
Step 1: Hardware setup
Step 2: Get the Bolt Cloud API and Device ID
Step 3: Set up a localhost URL
Step 4: Setup the IFTTT modules

Published October 1, 2020 © GPL3+

Room Temperature Monitoring Through Google Assistant

Trigger Google Assitant by saying "What's the Room Temperature" and you will be notified by IFTTT with your current room Temperature.

IntermediateFull instructions provided3 hours1,467

Room Temperature Monitoring Through Google Assistant

Things used in this project

Hardware components

Bolt IoT Bolt WiFi Module

Temperature Sensor

Jumper wires (generic)

USB-A to Micro-USB Cable

Software apps and online services

Bolt IoT Bolt Cloud

IFTTT Maker service

Story

The project helps the user to know the current Room temperature.

Start by saying "Hey Google, What's the room temperature".

IFTTT will notify you by a notification of your current room temperature where you have set the Temperature sensor.

Procedure

Step 1: Hardware setup

1. Connect the VCC pin of LM-35 sensor to 5V pin of the Bolt device.

2. Connect the GND pin of LM-35 sensor to GND pin of the Bolt device.

3. Connect the analog output pin of LM-35 sensor to Analog input (A0) pin of the Bolt device.

Make use of the male to female jumper wires to connect the temperature sensor to the bolt module

Step 2: Get the Bolt Cloud API and Device ID

API

Step 3: Set up a localhost URL

Type the below command to generate a public URL for a localhost

ssh -R 80:localhost:PORT_NUMBER ssh.localhost.run
Replace the [PORT_NUMBER] which you want to use for getting the POST request

A link has been generated: http://saksham-41d7db3c.localhost.run

Step 4: Setup the IFTTT modules

Get the IFTTT app from this link:

Open the IFTTT app
Click on create

Now, we have to set up two things: (If This, Then That)
Click On If This and search for Google Assistant and Fill the required forms

Google Assistant Trigger

Save it.
Now, click on Then That
And Then search for webhooks (and set up it by filling required data)

Webhook

Notice that I have put /temperatureRead after my URL that I have generated It is the python decorator that I'll talk later.

Save the current module.
Now, go and create another module to receive the notification
Same, as the above procedure GoTo create
Setup If this using webhook and then that as notifications

In the message, I have chosen value1.
Now, The IFTTT setup is complete.

Get The IFTTT API key form this link

Click on Documentation to get the API_KEY

LM35 Temperature Sensor Set Up

Installation(s): --------------------------------------------------------- Python Installation sudo apt-get update sudo apt-get install python3.6 check if the Installation was successful python3 --version If correctly installed it will show the python version --------------------------------------------------------- Flask Installation pip3 install Flask To check the Installation flask --version It correctly installed it will show Python and Flask version --------------------------------------------------------- Type the below command to setup an URL for your localhost ssh -R 80:localhost:PORT_NUMBER ssh.localhost.run Replace the [PORT_NUMBER] which you want to use for getting the POST request That's it! We now have an app that listens for a webhook with python and flask. Once deployed, POST requests made to the endpoint will trigger the respond function. For example: https://exampledomain.com/webhook. This is also the URL that you will provide the service that sends the webhook. --------------------------------------------------------- Running: --------------------------------------------------------- Perform the necessary Installation(s) --------------------------------------------------------- Place the main.py and conf.py file in same directory make an environment variable FLASK_APP which has the value main.py by:- export FLASK_APP=main.py (Don't put a space) Then run the app by flask run --------------------------------------------------------- setup an URL to listen for requests by: ssh -R 80:localhost:PORT_NUMBER ssh.localhost.run Replace the [PORT_NUMBER] which you want to use for getting the POST request ---------------------------------------------------------

Code

# Importing the Flask class along with the request and Response Objects
from flask import Flask, request, Response
# Importing the BolT modules
from boltiot import Bolt
# Importing the configuration file
import conf 
# Importing the request module to send http requests
import requests
# Importing the json object to read the data received from the bolt cloud(As the data format is JSON)
import json

# Instantiate Flask class with a name of __name__ before assignment it to the app variable
app = Flask(__name__)
# Instantiating the BoLT object using API KEY and Device Id
mybolt = Bolt(conf.BOLT_API_KEY, conf.DEVICE_ID)


def get_sensor_value_from_pin(pin):
    """Returns the sensor value. Returns -999 if request fails"""
    try:
        # Requesting the BoLT cloud to send the data from the cloud about the specified PIN
        response = mybolt.analogRead(pin)
        # Converting the response into JSON object
        data = json.loads(response)
        # Returning the sensor value
        return int(data["value"])
    except Exception as e: # If some problem occur I have setup exception handler
        print("Something went wrong when reading the sensor value")
        print(e)
        return -999

# app.route is a decorator to listen for POST requests made against the /temperatureRead path
# The decorator calls the function that immediately follows it when a request is made to the route
# In this case the function is respond that will be called
@app.route('/temperatureRead', methods=['POST']) # change it to post for getting request from ifttt
def respond():
    print(request.json)

    # Retrieving the A0 sensor value
    sensor_value = get_sensor_value_from_pin("A0")
    if sensor_value == -999:
        print("Request was unsuccessfull from sensor")
        return Response(status=200)

    # Converting the value obtained in Degree Celcius
    sensor_value = (100 * sensor_value) / 1024
    print("Value from sensor is: " + str(sensor_value))

    # Making an JSON object to be sent to IFTTT containg the information about the temperature
    dataToBeSend = {"value1":str(sensor_value), "value2":"", "value3":""}
    requests.post("https://maker.ifttt.com/trigger/receiveTemperature/with/key/" + conf.IFTTT_API_KEY, data=dataToBeSend)
    

    # This response tells that the sender that we received the hook
    return Response(status=200)

Credits

Saksham Gupta

1 project • 0 followers

Room Temperature Monitoring Through Google Assistant