Raspberry Pi Computing: Gas Sensors (Code Samples)
Raspberry Pi Computing: Gas Sensors
About the Book
If you've heard about the Raspberry Pi you may know that it provides a fantastic method to learn about using a computer and to develop some skills that go beyond the basics.
It has the ability to provide a bridge between the sometimes abstract computing environment and the physical world. In this case we are going to use it to connect to one of the MQ series of gas sensors that will allow us to measure the presence of different compounds in the air and by entension to know more about our environment.
What sort of things will we learn?
Good question!
- What sort of versions of the Raspberry Pi are there?
- What hardware do I need to get it up and going?
- What sort of operating system do I need and how do we install it.
- How do I do [Insert any number of cool things]?
Is this book for you?
It's not written for experts. It's put together as a guide to get you started if you're unsure about how to make the first move with a Raspberry Pi.
Why has the book been written?
Because in the process of learning things, it's a great way to remember them if you write them down :-).
Writing about how to do cool stuff with computers means that we're accumulating ways to help ourselves out when the going gets tricky. Making a book out of the information is a no-brainer since that way more people benefit from the process.
The awesome that is Leanpub.
The book has some information in it, but there will be updates over time. Publishing using Leanpub will allow readers to get easy notification of when updates and improvements are made.
Enjoy.
So we hope you get something out of the book, please excuse the sometimes light-hearted conversational manner in which we approach the topic and enjoy the Raspberry Pi!
About the Author
Bundles that include this book
Table of Contents
-
Introduction
- Welcome!
- What are we trying to do?
- Who is this book for?
- What will we need?
- Why on earth did I write this rambling tome?
- Where can you get more information?
- The History of the Raspberry Pi
-
Raspberry Pi Versions
-
Raspberry Pi B+, B2, B3 and B3+
- USB Ports
- Video Out
- Ethernet Network Connection
- USB Power Input Jack
- MicroSD Flash Memory Card Slot
- Stereo and Composite Video Output
- 40 Pin Header
-
Raspberry Pi B+, B2, B3 and B3+
-
Raspberry Pi Peripherals
- SD Card
- Keyboard / Mouse
- Network
- Cases
-
Operating Systems
-
Welcome to Raspbian
- Downloading
- Writing the Operating System image to the SD Card
- Enabling Secure Shell Access
- Powering On
-
The Command Line interface
- Raspberry Pi Software Configuration Tool
- Software Updates
-
Welcome to Raspbian
-
Power Up the Pi
-
Static IP Address
-
The Netmask
- CIDR Notation
- Distinguish Dynamic from Static
- Default Gateway
-
Lets edit the
dhcpcd.conffile
-
The Netmask
-
Remote access
-
Remote access via SSH
- Setting up the Server (Raspberry Pi)
- Setting up the Client (Windows)
- WinSCP
-
Remote access via SSH
-
Setting up a WiFi Network Connection
-
Built in WiFi Enabling
- Make the changes operative
- Make the built in WiFi IP address static
- Make the changes operative
-
WiFi Via USB Dongle
- Editing files
- Make the changes operative
- Make USB WiFi IP address static
- Make the changes operative
-
Built in WiFi Enabling
-
Reconnecting to the wireless network automatically
- Let’s write a script
- Lets run our script on a regular schedule
- Let’s test it
-
Static IP Address
-
Setting up the Raspberry Pi Software
-
Web Server, PHP and Database
-
Install NGINX and PHP
- Configuration
- Database
- Create a database and a table
-
Install NGINX and PHP
-
Web Server, PHP and Database
-
Connecting the gas sensor to the Raspberry Pi
-
Analog and Digital
- Analog
- Digital
- Analog to Digital Conversion (ADC)
- The Sensor
-
Analog to Digital Conversion (ADC)
- The ADS1015 Analog to Digital Converter
-
Measure
- Hardware required
- Connect
- Test
-
Record
- Record the readings
-
Recording data on a regular basis with
cron - Managing database size
-
Explore
- Simple data point API
- Extracting a Range of Data
- Wrap Up
- Bibliography
-
Analog and Digital
-
Linux Concepts
- What is Linux?
-
Linux Directory Structure
-
/ -
/bin -
/boot -
/dev -
/etc -
/etc/cron.d -
/etc/rc?.d -
/home -
/lib -
/lost+found -
/media -
/mnt -
/opt -
/proc -
/root -
/sbin -
/srv -
/tmp -
/usr -
/usr/bin -
/usr/lib -
/usr/local -
/usr/sbin -
/var -
/var/lib -
/var/log -
/var/spool -
/var/tmp
-
-
Everything is a file in Linux
- Traditional Files
- Directories
- System Information
- Devices
-
File Editing
- The nano Editor
-
Linux Commands
- Executing Commands in Linux
-
The Commands
-
- Options
- Arguments
- Putting it all together
-
apt-get-
The
apt-getcommand -
apt-get update -
apt-get upgrade -
apt-get install -
apt-get remove
-
The
-
cat-
The
catcommand - Options
- Arguments and Examples
- Test yourself
-
The
-
cd-
The
cdcommand - Options
- Arguments
- Examples
- Test yourself
-
The
-
chmod-
The
chmodcommand - Options
- Arguments
- Examples
-
The
-
crontab
-
The
crontabcommand - Options
- Examples
- Test yourself
-
The
-
ifconfig-
The
ifconfigcommand - Options
- Arguments
- Test yourself
-
The
-
ls-
The
lscommand - Options
- Arguments
- Examples
-
The
-
sudo-
The
sudocommand - The ‘sudoers’ file
-
sudovssu - Test yourself
-
The
-
- Directory Structure Cheat Sheet
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