5. Adding a Webcam to Monitor Your Security System | Internet of Things Programming with JavaScript

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Table Of Contents

Internet of Things Programming with JavaScript

By : Ruben Oliva Ramos

Internet of Things Programming with JavaScript

By: Ruben Oliva Ramos

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.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Getting Started with Raspberry Pi Zero

1. Getting Started with Raspberry Pi Zero

Setting up Raspberry Pi Zero

Connecting to the home network and accessing remotely

How to install the wireless tools

Testing the communication

Updating the package repository

Remote Desktop

Configuring a web server

Testing the PHP installation

Summary

2. Connecting Things to the Raspberry Pi Zero

2. Connecting Things to the Raspberry Pi Zero

Connectting digital input - sensor DS18B20

Configuring the one-wire protocol

Connecting analog inputs using an MCP3008 ADC Converter

Raspberry Pi GPIO header

Connecting an RTC

DS3231 module setup

Testing the RTC

I2C device setup

Putting the real-time clock to final test

Summary

3. Connecting Sensors - Measure the Real Things

3. Connecting Sensors - Measure the Real Things

Measuring flow sensor to calculate the volume of water

Reading and counting pulses with Arduino

Calculating water flow rate based on the pulses counted

Calculating flow and volume of water:

Measuring the concentration of gas

Measuring the level of alcohol with a sensor

Detecting fire with a sensor

Measuring the humidity for plants

Measuring the level of water in a recipient

Measuring temperature, humidity, and light and displaying data on an LCD

Detecting motion with a PIR sensor

Detecting if the door is open with a reed switch

Detecting who can get in the house with a fingerprint sensor

Summary

4. Control-Connected Devices

4. Control-Connected Devices

Making a simple web server with Node.js

Controlling a relay from a Raspberry Pi Zero using Restful API and Node.js

Controlling the relay using aREST commands from a web browser

Configuring Node.js on a computer as a web server

Monitoring temperature, humidity, and light using Node.js with Arduino Wi-Fi

Monitoring temperature, humidity, and light using Node.js with Arduino Ethernet

Summary

5. Adding a Webcam to Monitor Your Security System

5. Adding a Webcam to Monitor Your Security System

Interaction between Arduino and Raspberry Pi

Arduino interface in Raspian

Controlling an output connected to Arduino from Raspberry Pi Zero

Controlling the Arduino board from Python

Connecting a TTL serial camera to Arduino and saving pictures to a micro SD

Detecting motion with the serial TTL camera

Controlling a snapshot from Raspberry Pi

Controlling your camera from a web page

Monitoring your USB camera for security in a network

Summary

6. Building a Web Monitor and Controlling Devices from a Dashboard

6. Building a Web Monitor and Controlling Devices from a Dashboard

Configuring MySQL database server

Installing PhpMyAdmin for administrating databases

Datalogger with MySQL

Data queries from the database

Controlling and dimming a LED

Controlling the speed of a DC motor

Controlling Lights with electrical circuits

Other appliances

Remote access from anywhere to your Raspberry Pi Zero

Controlling lights and measuring current consumption

Controlling and monitoring Arduino, Wi-Fi, and Ethernet shields on connected devices and sensors

Summary

7. Building a Spy Police with the Internet of Things Dashboard

7. Building a Spy Police with the Internet of Things Dashboard

Spy microphone that detects noise

Regulating the current of an AC lamp dimmer

Controlling access with an RFID card

Detecting smoke

Building an alarm system using the Raspberry Pi Zero

Monitoring the climate from a remote dashboard

Summary

8. Monitoring and Controlling Your Devices from a Smart Phone

8. Monitoring and Controlling Your Devices from a Smart Phone

Controlling a relay from a smart phone using APP Inventor

Creating our first application

Reading JSON response in Android Studio using ethernet shield

Android application

Controlling a DC motor using an Android Application

Controlling outputs from android using your Raspberry Pi Zero

Controlling outputs with Raspberry Pi via Bluetooth

Summary

9. Putting It All Together

9. Putting It All Together

Integrating the system - development projects

Solar power monitor circuit

Automatic irrigation system with a soil sensor

Arduino water-level controller

Bluetooth based home automation

Controlling access with a matrix keyboard

Controlling the door lock with a keypad

Integrating the system control with relays and devices

How to set up the power supplies

Summary

Controlling an output connected to Arduino from Raspberry Pi Zero

Now we will look at an example of controlling an output from the Raspberry Pi, using Python.

First we need to download the sketch to the Arduino board. To test our communication, we will show an example of testing the link between the Arduino and the Raspberry Pi:

We declare the following output:

int led_output = 13;

We start with the setup in the program:

void setup () {

Then we mention the output pin:

pinMode(led_output, OUTPUT);

Start the serial communication at 9600:

Serial.begin(9600); 
}

Declare the loop of the program:

void loop () {

This is where we check weather serial port is available or not:

if (Serial.available() > 0){

If something found it reads something and saves the content in c variable:

char c = Serial.read();

If it reads a letter H which is marked for high:

      if (c == 'H'){

The output will turn on the LED connected to pin 13

digitalWrite(led_output, HIGH); 
...

Visually different images

CONTINUE READING

83

Tech Concepts

36

Programming languages

73

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