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  • Book Overview & Buying Internet of Things Programming with JavaScript
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Internet of Things Programming with JavaScript

Internet of Things Programming with JavaScript

By : Ruben Oliva Ramos
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Internet of Things Programming with JavaScript

Internet of Things Programming with JavaScript

By: Ruben Oliva Ramos
Buy this Book

Overview of this book

The Internet of Things is taking the tech world by storm, and JavaScript is at its helm. This book will get you to grips with this exciting new technology. Where do Node.js, HTML5 and Windows 10 IoT Core come in with JavaScript and IoT? Why Raspberry Pi Zero rather than Arduino? How do you configure and build an IoT network from scratch? All your IoT JavaScript questions are answered in this book.
Table of Contents (10 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
Lock Free Chapter
1
1. Getting Started with Raspberry Pi Zero
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1. Getting Started with Raspberry Pi Zero
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Setting up Raspberry Pi Zero
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Connecting to the home network and accessing remotely
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How to install the wireless tools
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Testing the communication
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Updating the package repository
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Remote Desktop
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Configuring a web server
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Testing the PHP installation
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Summary
2
2. Connecting Things to the Raspberry Pi Zero
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2. Connecting Things to the Raspberry Pi Zero
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Connectting digital input - sensor DS18B20
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Configuring the one-wire protocol
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Connecting analog inputs using an MCP3008 ADC Converter
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Raspberry Pi GPIO header
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Connecting an RTC
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DS3231 module setup
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Testing the RTC
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I2C device setup
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Putting the real-time clock to final test
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Summary
3
3. Connecting Sensors - Measure the Real Things
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3. Connecting Sensors - Measure the Real Things
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Measuring flow sensor to calculate the volume of water
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Reading and counting pulses with Arduino
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Calculating water flow rate based on the pulses counted
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Calculating flow and volume of water:
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Measuring the concentration of gas
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Measuring the level of alcohol with a sensor
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Detecting fire with a sensor
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Measuring the humidity for plants
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Measuring the level of water in a recipient
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Measuring temperature, humidity, and light and displaying data on an LCD
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Detecting motion with a PIR sensor
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Detecting if the door is open with a reed switch
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Detecting who can get in the house with a fingerprint sensor
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Summary
4
4. Control-Connected Devices
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4. Control-Connected Devices
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Making a simple web server with Node.js
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Controlling a relay from a Raspberry Pi Zero using Restful API and Node.js
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Controlling the relay using aREST commands from a web browser
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Configuring Node.js on a computer as a web server
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Monitoring temperature, humidity, and light using Node.js with Arduino Wi-Fi
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Monitoring temperature, humidity, and light using Node.js with Arduino Ethernet
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Summary
5
5. Adding a Webcam to Monitor Your Security System
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5. Adding a Webcam to Monitor Your Security System
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Interaction between Arduino and Raspberry Pi
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Arduino interface in Raspian
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Controlling an output connected to Arduino from Raspberry Pi Zero
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Controlling the Arduino board from Python
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Connecting a TTL serial camera to Arduino and saving pictures to a micro SD
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Detecting motion with the serial TTL camera
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Controlling a snapshot from Raspberry Pi
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Controlling your camera from a web page
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Monitoring your USB camera for security in a network
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Summary
6
6. Building a Web Monitor and Controlling Devices from a Dashboard
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6. Building a Web Monitor and Controlling Devices from a Dashboard
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Configuring MySQL database server
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Installing PhpMyAdmin for administrating databases
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Datalogger with MySQL
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Data queries from the database
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Controlling and dimming a LED
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Controlling the speed of a DC motor
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Controlling Lights with electrical circuits
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Other appliances
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Remote access from anywhere to your Raspberry Pi Zero
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Controlling lights and measuring current consumption
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Controlling and monitoring Arduino, Wi-Fi, and Ethernet shields on connected devices and sensors
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Summary
7
7. Building a Spy Police with the Internet of Things Dashboard
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7. Building a Spy Police with the Internet of Things Dashboard
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Spy microphone that detects noise
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Regulating the current of an AC lamp dimmer
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Controlling access with an RFID card
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Detecting smoke
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Building an alarm system using the Raspberry Pi Zero
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Monitoring the climate from a remote dashboard
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Summary
8
8. Monitoring and Controlling Your Devices from a Smart Phone
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8. Monitoring and Controlling Your Devices from a Smart Phone
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Controlling a relay from a smart phone using APP Inventor
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Creating our first application
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Reading JSON response in Android Studio using ethernet shield
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Android application
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Controlling a DC motor using  an Android Application
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Controlling outputs from android using your Raspberry Pi Zero
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Controlling outputs with Raspberry Pi via Bluetooth
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Summary
9
9. Putting It All Together
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9. Putting It All Together
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Integrating the system - development projects
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Solar power monitor circuit
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Automatic irrigation system with a soil sensor
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Arduino water-level controller
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Bluetooth based home automation
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Controlling access with a matrix keyboard
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Controlling the door lock with a keypad
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Integrating the system control with relays and devices
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How to set up the power supplies
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Summary

Setting up Raspberry Pi Zero

The Raspberry Pi is a low-cost board dedicated to purpose projects. Here, we will use a Raspberry Pi Zero board. Take a look at the following link:  https://www.adafruit.com/products/2816. I used this board.

In order to make the Raspberry Pi work, we need an operating system that acts as a bridge between the hardware and the user. This book uses the Raspbian Jessy, which can be downloaded from https://www.raspberrypi.org/downloads/. At this link, you will find all of the information you need to download all the pieces of software necessary to use with your Raspberry Pi to deploy Raspbian. You need a micro SD card of at least 4 GB.

The kit that I used to test the Raspberry Pi Zero includes all the necessary things for installing everything and getting the board ready:

Setting up Raspberry Pi Zero

Preparing the SD card

The Raspberry Pi Zero only boots from an SD card and cannot boot from an external drive or USB stick. For this book, it's recommended to use a 4 GB micro SD card.

Installing the Raspbian operating system

There are many operating systems that are available for the Raspberry Pi board, most of which are based on Linux. However, the one that is usually recommended is Raspbian, is an operating system based on Debian, which was specifically made for Raspberry Pi.

In order to install the Raspbian operating system on your Pi, follow the next steps:

  1. Download the latest Raspbian image from the official Raspberry Pi website: https://www.raspberrypi.org/downloads/raspbian/ 
  2. Next, insert the micro SD card into your computer using an adapter. (An adapter is usually given with the SD card.)
  3. Then download Win32DiskImager from https://sourceforge.net/projects/win32diskimager/.

    You will see the following files, as shown in the screenshot, after downloading the folder:

    Installing the Raspbian operating system
  4. Open the file image, select the path where you have the micro SD card, and click on the Write button.
  5. After a few seconds,you have Raspbian installed on your SD card; insert it into Raspberry Pi and connect the Raspberry Pi board to the power source via the micro-USB port.

    In the following screenshot, you can see the progress of the installation:

    Installing the Raspbian operating system

Debugging your Raspberry Pi Zero with a serial console cable

In this section, we will look at how to communicate, the Raspberry Pi Zero from a computer using a TTL serial converter. We can do this debugging with a serial console cable connected to the computer using the USB port. We communicate with the board with a serial cable, because if we want to send commands from our computer to the board, it's necessary to communicate using this cable. You can find the cable at https://www.adafruit.com/products/954:

Debugging your Raspberry Pi Zero with a serial console cable

It’s important to consider that the cable uses 3.3 volts, but we don’t care because we’re using the cable from Adafruit. It is tested to work at this level of voltage.

You need to follow the next steps in order to install and communicate with your Raspberry Pi Zero:

  1. It's necessary that you have a free USB port on your computer.
  2. We need to install the driver for the serial console cable so that the system can recognize the hardware. We recommend that you download the driver from https://www.adafruit.com/images/product-files/954/PL2303_Prolific_DriverInstaller_v1_12_0.zip.
  3. We use an interface (console software), called PuTTY, running on a Windows computer; so we can communicate with our board, the Raspberry Pi. This software can be downloaded and installed from http://www.putty.org/.
  4. For the connections, we need to connect the red cable to  5 volts, the black cable to ground, the white cable to the TXD pin, and the green cable to the RXD pin on the Raspberry Pi Zero.
  5. The other side of the cable connects the plug to the USB port.

This is an image of the connections; it's for the hardware configuration:

Debugging your Raspberry Pi Zero with a serial console cable

Testing and accessing the serial COM interface

Once the driver is installed, we have here the Port COM, which is already installed:

Tip

This configuration is for Windows installation; if you have different operating system, you need to do different steps.

How get the Device Manager screen: On your windows PC, click on the Start icon, go to Control Panel, select System, and then click on Device Manager.

In the following screenshot, you can see the device manager of the USB serial port:

Testing and accessing the serial COM interface
  1. Open the terminal in PuTTY, and select Serial Communication as COM3, Speed as 115200, Parity as None, and Flow Control as None; click on Open:
    Testing and accessing the serial COM interface
  2. When the blank screen appears, press Enter on your keyboard:
    Testing and accessing the serial COM interface
  3. This initiates a connection to your Pi board and asks for your username and password; you will see a screen like the following screenshot, with the authentication login:
    Testing and accessing the serial COM interface
  4. The default username for the Raspberry Pi Zero is pi, and the password is raspberry:
    Testing and accessing the serial COM interface
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Internet of Things Programming with JavaScript
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