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Home > IoT & Hardware > Wearable Tech > Raspberry Pi Sensors
Raspberry Pi Sensors
Raspberry Pi Sensors

Raspberry Pi Sensors: Integrate sensors into your Raspberry Pi projects and let your powerful microcomputer interact with the physical world

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eBook Apr 2015 192 pages 1st Edition
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Raspberry Pi Sensors

Chapter 2. Meeting the World of Electronics

You can't spend even a day without electronics, can you? Electronics is everywhere, from your toothbrush to cars and in aircrafts and spaceships too. In this chapter, we will go through the fundamental concepts of electronics that will be useful while building our projects so that one day we can make our own products and amaze the world. This chapter will help you understand the concepts of electronics that can be very useful while working with the RasPi.

You might have read many electronics-related books, and they might have bored you with concepts when you really wanted to create or build projects. I believe that there must be a reason for explanations being given about electronics and its applications. Hence this chapter provides basic explanations of various terminologies in electronics and their usefulness in the projects.

Once you know about the electronics, we will walk through the communication protocols and their uses with...

Basic terminologies of electronics

There are numerous terminologies used in the world of electronics. From the hardware to the software, there are millions of concepts that are used to create astonishing products and projects. You already know that the RasPi is a single-board computer that contains plentiful electronic components built in, which makes us very comfortable to control and interface the different electronic devices connected through its GPIO port. In general, when we talk about electronics, it is just the hardware or a circuit made up of several Integrated Circuits (ICs) with different resistors, capacitors, inductors, and many more components. But that is not always the case; when we build our hardware with programmable ICs, we also need to take care of internal programming (the software). For example, in a microcontroller or microprocessor, or even in the RasPi's case, we can feed the program (technically, permanently burn/dump the programs) into the ICs so that when...

Communication protocols

It has been a lot theory so far. The previous section was meant to give you an understanding of some useful concepts of electronics. There can be numerous components, including ICs and digital sensors, as peripherals of a microprocessor. There can be a large amount of data with the peripheral devices, and there might be a need to send it to the processor. How do they communicate? How does the processor understand that the data is coming into it and that it is being sent by the sensor? There is a serial, or parallel, data-line connection between ICs and a microprocessor. Parallel connections are faster than the serial one but are less preferred because they require more lines, for example, 8, 16, or more than that. A PCI bus can be an example of a parallel communication. Usually in a complex or high-density circuit, the processor is connected to many peripherals, and in that case, we cannot have that many free pins/lines to connect an additional single IC. Serial...

Useful tips and precautions

Before we discuss the practicality side of the RasPi, let's look at the precautions and tips when working with RasPi. You need to read this, as you are now going to work with the GPIOs of the RasPi. This section will give you generalized tips and warnings to keep in mind when working with the RasPi:

  • Avoid touching the electronic components on the RasPi, as even a small amount of sweat or a static charge from your body can spoil the board. The components on the board are so small that it can be affected by a very small amount of sweat in your hand, and by water too. Touch it from the corners, or always use a casing to cover it. There are a plenty of these available in e-stores.
  • Take care when putting the RasPi on the table. If there is a small metal part (cut pieces of wires) or the table itself is made of a metal, it can short the connections on the RasPi.
  • Never connect any device that provides voltage higher than 3.3V to the RasPi's GPIO pins. In Chapter...

Understanding the GPIO port

You will find working with GPIO very interesting! You already know from the first chapter that the GPIO pins are the configurable pins of a processor and if you will closely see the RasPi board, the GPIO functionality is brought out on board pin-out header from the processor in such a way that the GPIO status can be changed and also be read during the runtime. That is what we are going to do in this section. While programming, you will notice that the RasPi's GPIO has two modes: board mode and BCM mode. Board mode can be seen as the pin numbers physically seen on the board, which are internally connected to the processor. As the processor has numerous pins and GPIOs available, the processor pin number and the board header pin number will always be different. For example, the processor has internally assigned the GPIO 17 designation on its own pin, while on the RasPi board, a connector will have number 11 of the pin. Let's see the available GPIO pins...

It's time to glow LEDs!

Let's gather some components and wires first. You need a standard LED (one piece, forward voltage, and 3.3V), wires (one red and one black, with a 2.54 mm female-to-female jumper wire connector), an Ethernet cable, your PC, and the RasPi+.

The standard setup that we had all the time and we will follow is PC (Windows/Mac/Linux) with PuTTY or the terminal installed. There is also the Ethernet connection of the PC with the RasPi, with the entire configuration and setup explained in Chapter 1, Meeting Your Buddy – the Raspberry Pi. What I assume now is that your PC is running a live session with the RasPi. Take the LED in your hand and carefully observe that among the two terminals, one terminal is longer than the other; this is the positive (anode) terminal of the LED. The shorter terminal on LED is negative (ground) and it should be connected to pin 6 (GND) of the RasPi. Carefully connect the positive terminal to pin 11 (BCM GPIO 17, refer to GPIO table...

Basic terminologies of electronics

There are numerous terminologies used in the world of electronics. From the hardware to the software, there are millions of concepts that are used to create astonishing products and projects. You already know that the RasPi is a single-board computer that contains plentiful electronic components built in, which makes us very comfortable to control and interface the different electronic devices connected through its GPIO port. In general, when we talk about electronics, it is just the hardware or a circuit made up of several Integrated Circuits (ICs) with different resistors, capacitors, inductors, and many more components. But that is not always the case; when we build our hardware with programmable ICs, we also need to take care of internal programming (the software). For example, in a microcontroller or microprocessor, or even in the RasPi's case, we can feed the program (technically, permanently burn/dump the programs) into the ICs so that when the IC...

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Description

This book is perfect for hardware enthusiasts who want to develop amazing projects using Raspberry Pi. Some knowledge and experience working with Linux, C, and Python is a plus, but once you're set up to go, you'll be ready to push the creative capabilities of your Raspberry Pi even further.

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Apr 29, 2015
Length: 192 pages
Edition : 1st
Language : English
ISBN-13 : 9781784392123
Vendor :
Raspberry Pi
Category :
IoT & Hardware
Concepts :
Wearable Tech
Tools :
Raspberry Pi

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Publication date : Apr 29, 2015
Length: 192 pages
Edition : 1st
Language : English
ISBN-13 : 9781784392123
Vendor :
Raspberry Pi
Category :
IoT & Hardware
Concepts :
Wearable Tech
Tools :
Raspberry Pi

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Table of Contents

9 Chapters
1. Meeting Your Buddy – the Raspberry Pi Chevron down icon Chevron up icon
1. Meeting Your Buddy – the Raspberry Pi
A glance at the Raspberry Pi board
Setting up for the first time
Connecting the Raspberry Pi to the Internet
A crash course on Linux
Installing useful libraries
python-gpio
Be ready with Python and C
Practice makes you perfect
Summary
2. Meeting the World of Electronics Chevron down icon Chevron up icon
2. Meeting the World of Electronics
Basic terminologies of electronics
Communication protocols
Useful tips and precautions
Understanding the GPIO port
It's time to glow LEDs!
Summary
3. Measuring Distance Using Ultrasonic Sensors Chevron down icon Chevron up icon
3. Measuring Distance Using Ultrasonic Sensors
The mysterious ultrasonic sensor
Building the project!
Fixing common problems
A wearable device for the visually impaired
Summary
4. Monitoring the Atmosphere Using Sensors Chevron down icon Chevron up icon
4. Monitoring the Atmosphere Using Sensors
Sensor selection process
InsideDHT – temperature and humidity sensors
Introducing the photoresistor (photocell)
Building the project
Putting all the parts together
Troubleshooting common problems
Summary
5. Using an ADC to Interface any Analog Sensor with the Raspberry Pi Chevron down icon Chevron up icon
5. Using an ADC to Interface any Analog Sensor with the Raspberry Pi
Analog-to-digital convertors
MCP3008 for analog-to-digital conversion
Making your own sensor station
Generic software preparation
Using your sensor station – make a temperature logger
Summary
6. Uploading Data Online – Spreadsheets, Mobile, and E-mails Chevron down icon Chevron up icon
6. Uploading Data Online – Spreadsheets, Mobile, and E-mails
Internet of Things
Hardware setup
Synchronizing the clock with the Internet
Uploading data on Google spreadsheets
Getting notified by e-mails
Integrating everything
Common problems faced
Summary
7. Creating an Image Sensor Using a Camera and OpenCV Chevron down icon Chevron up icon
7. Creating an Image Sensor Using a Camera and OpenCV
Image processing
OpenCV
Camera interfacing with the RasPi
Live streaming using a network camera
Porting OpenCV
Create a motion detector
Amazing projects for you
Summary
A. Shopping List Chevron down icon Chevron up icon
Basic requirements
Sensors
Integrated chips
Components
Others
Index Chevron down icon Chevron up icon
Index

Customer reviews

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Full star icon Full star icon Full star icon Full star icon Half star icon 4.4
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Afreeca Jul 24, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I have been loving to read this book, it made me understood all very well raspberry pi and some electronics/sensors connections
Amazon Verified review Amazon
Amazon Customer Oct 09, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Raspberry pi sensors is a great source for those who want to learn or teach how to use sensors. The author gradually introduces the reader to electronics. Each chapter include the concepts necessary to understand not just how to wire/program the sensor but also explain how it works. Chapter 5 describes how to add an ADC (Analog to Digital) interface to the Raspberry Pi. Regardless if the reader decides not to build any of the other projects listed in the book, ADC project in chapter 5 is a most. ADC support expands your Raspberry PI device interface capabilities. There is one area partially addressed by the author. There are multiple references to I2C interface but no example how to communicate with I2C sensor and gather data sample
Amazon Verified review Amazon
Gopinath Palaniappan Oct 09, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Raspberry Pi Sensors"Integrate sensors into your Raspberry Pi projects and let your powerful microcomputer interact with the physical world"Author: Rushi GajjarAs the name suggests, its a book that teaches you how to interface various sensors with the Raspberry Pi.There is lots of electronics, software and a machup to create practical applications. Here's a summary of each chapter:* C1 : Includes basic setup of Raspberry Pi, software installation, Intro to C/Python* C2 : Introduction to basic electronics, working with GPIO ports* C3 : Interfacing the Ultra Sonic Sensor to measure distance* C4 : Interfacing the DHT and LDR sensors to measure temperature and light* C5 : Learn about ADC (Analog to Digital convertors)* C6 : Logging data to internet for analytics* C7 : Attaching an image sensor and processing the images with OpenCVThe best chapter for me was Chapter 6. It gives you a practical insight into how you can instrument data collection and pass it on to an online spreadsheet to get real time analytics.Link to the books:http://www.amazon.com/dp/1784393614 [$14.59 kindle/$29.99 print]https://www.packtpub.com/hardware-and-creative/raspberry-pi-sensors [$23.99 ebook/$29.99 print+ebook]
Amazon Verified review Amazon
Chaminda Divitotawela Jun 01, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I am still a beginner of using Raspberry Pi. I have already purchased few sensors without much knowledge and did not know how to use them. This book helped me understanding the use of sensors with some understanding of them. It has a good bit of theory to back the practical protects. It is good approach otherwise it would doing things in dark. Book covers bit of electronics and starting with Linux. This help absolute beginner also to start with the Raspberry Pi. Overall, I find the book is very useful for someone getting started with Raspberry Pi and sensors.
Amazon Verified review Amazon
Jorge Oct 09, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Raspberry pi sensors is a great source for those who want to learn or teach how to use sensors. The author gradually introduces the reader to electronics. Each chapter include the concepts necessary to understand not just how to wire/program the sensor but also explain how it works. Chapter 5 describes how to add an ADC (Analog to Digital) interface to the Raspberry Pi. Regardless if the reader decides not to build any of the other projects listed in the book, ADC project in chapter 5 is a most. ADC support expands your Raspberry PI device interface capabilities. There is one area partially addressed by the author. There are multiple references to I2C interface but no example how to communicate with I2C sensor and gather data sample
Amazon Verified review Amazon

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About the author

Profile icon Rushi Gajjar
Rushi Gajjar
LinkedIn icon
Rushi Gajjar is an entrepreneur, embedded systems hardware developer and a lifetime electronics enthusiast. He works in the field of research and development of high-speed single-board embedded computers and wireless sensor nodes for the Internet of Things. Prior to that, his extensive work as a freelancer in the domain of electronics hardware design introduced him to rapid prototyping development boards and single board embedded computers such as the Raspberry Pi. In the spare time, he loves to develop the projects on Raspberry Pi including sensors, imaging, data logging, web-servers, and machine learning automation systems. He authored a DIY and hardware based book titled Raspberry Pi Sensors which takes deep dive in developing sensor interfacing based projects with Raspberry Pi. His vision encompasses connecting every entity in world to the Internet for enhancing the human living experience. https://www.linkedin.com/in/rushigajjarhttp://www.amazon.com/Raspberry-Pi-Sensors-Rushi-Gajjar/dp/1784393614/ref=sr_1_9?ie=UTF8&qid=1453884207&sr=8-9&keywords=raspberry+Pi+Sensorshttp://rushigajjar.blogspot.in/
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