Sensor-ai

ESP8266, thingspeak.com, DHT11 sensor data interacting with SignalWire's AI technology

sensor_data Function

Perl modules:

• LWP::Simple for fetching data from the web,
• JSON for parsing JSON data,
• Plack for creating a simple web application, and
• SignalWire::ML for constructing responses (assuming this is part of your application's architecture).

Step-by-Step Guide

1. Setting Up Your Perl Script

First, ensure you have Perl installed on your system along with the necessary modules. You can install missing modules using CPAN:

cpan install LWP::Simple JSON Plack

Start by importing the required modules at the beginning of your script:

use strict;
use warnings;
use Plack::Request;
use Plack::Response;
use SignalWire::ML;
use JSON qw(decode_json);
use LWP::Simple qw(get);

2. Fetching JSON Data

Define the URL of the JSON data you intend to fetch. In this example, we're using ThingSpeak's API to get the latest two entries of environmental data from a specific channel:

my $json_url = "https://api.thingspeak.com/channels/1464062/feeds.json?results=2";

Use LWP::Simple's get function to fetch the data:

my $json_text = get($json_url);
die "Could not fetch JSON data" unless defined $json_text;

3. Processing the JSON Data

Decode the fetched JSON text into a Perl data structure using the JSON module:

my $decoded_json = decode_json($json_text);

Extract the necessary data from the decoded JSON. For instance, to get the temperature and humidity from the latest feed entry:

my $latest_feed = $decoded_json->{feeds}[-1];
my $temperature = $latest_feed->{field1};
my $humidity    = $latest_feed->{field2};

4. Constructing the HTTP Response

Create a new response object with Plack::Response and set the content type to application/json:

my $res = Plack::Response->new(200);
$res->content_type('application/json');

Construct the response body to include the temperature and humidity information:

my $response_text = "The latest temperature is $temperature degrees, and the humidity is $humidity%.";
$res->body($swml->swaig_response_json({ response => $response_text }));

5. Finalizing the Response

Return the finalized response from your application:

return $res->finalize;