Book Image

Building Smart Homes with Raspberry Pi Zero

By : Marco Schwartz
Book Image

Building Smart Homes with Raspberry Pi Zero

By: Marco Schwartz

Overview of this book

The release of the Raspberry Pi Zero has completely amazed the tech community. With the price, form factor, and being high on utility—the Raspberry Pi Zero is the perfect companion to support home automation projects and makes IoT even more accessible. With this book, you will be able to create and program home automation projects using the Raspberry Pi Zero board. The book will teach you how to build a thermostat that will automatically regulate the temperature in your home. Another important topic in home automation is controlling electrical appliances, and you will learn how to control LED Lights, lamps, and other electrical applications. Moving on, we will build a smart energy meter that can measure the power of the appliance, and you’ll learn how to switch it on and off. You’ll also see how to build simple security system, composed of alarms, a security camera, and motion detectors. At the end, you will integrate everything what you learned so far into a more complex project to automate the key aspects of your home. By the end, you will have deepened your knowledge of the Raspberry Pi Zero, and will know how to build autonomous home automation projects.
Table of Contents (17 chapters)
Building Smart Homes with Raspberry Pi Zero
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Storing sensor data


Displaying the current measurements from the sensor is nice, but what is even better is to actually store that data inside a database. In this section, we are going to see how easy it is to do this with Node.js.

As a database, we'll simply use NeDB here, which is a really simple database for Node.js that is completely stored in memory, but you can also save the entire database in a file.

The code is actually very similar to what we saw in the previous section. However, here, we'll first import the database module, and then insert data inside the database when a measurement is done:

var Datastore = require('nedb')
  , db = new Datastore({ filename: 'path/to/datafile', autoload: true });
sdfsd
var readout = sensorLib.read();

// Log
var data = {
    humidity: readout.humidity.toFixed(2),
    temperature: readout.temperature.toFixed(2),
    date: new Date()
};
db.insert(data, function (err, newDoc) {
    console.log(newDoc);
});

// Repeat
setTimeout(function () {
    sensor...