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Building Smart Homes with Raspberry Pi Zero

You're reading from   Building Smart Homes with Raspberry Pi Zero Build revolutionary and incredibly useful home automation projects with the all-new Pi Zero

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Product type Book
Published in Oct 2016
Publisher Packt
ISBN-13 9781786466952
Pages 196 pages
Edition 1st Edition
Languages
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Author (1):
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Marco Schwartz Marco Schwartz
Author Profile Icon Marco Schwartz
Marco Schwartz
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Toc

Table of Contents (12) Chapters Close

Preface 1. Configuring Your Raspberry Pi Zero Board FREE CHAPTER 2. Measure Data Using Your Raspberry Pi Zero Board 3. Building a Smart Home Thermostat 4. Controlling Appliances fromthe Raspberry Pi Zero 5. Making a Smart Plug with the Raspberry Pi Zero 6. Sending Notifications using Raspberry Pi Zero 7. Use the Raspberry Pi Zero to Build a Security System 8. Monitor Your Home from the Cloud 9. Control Appliances from Anywhere 10. Building a Home Automation System with Raspberry Pi Zero Boards Index

Reading data from the sensor

As the first project of this chapter, we are simply going to see how to read data from the sensor. As for all the projects in this book, we'll use Node.js, which is a great framework for building projects on your Raspberry Pi Zero.

I will now go through the main parts of this first piece of code. It starts by including the DHT sensor module for Node.js:

var sensorLib = require('node-dht-sensor');

Then, we create an object to read data from the sensor and initialize it when we start the software:

var sensor = {
    initialize: function () {
        return sensorLib.initialize(11, 4);
    },
    read: function () {
        var readout = sensorLib.read();
        console.log('Temperature: ' + readout.temperature.toFixed(2) + 'C, ' +
            'humidity: ' + readout.humidity.toFixed(2) + '%');
        setTimeout(function () {
            sensor.read();
        }, 2000);
    }
};

if (sensor.initialize()) {
  ...
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