September 2016
Beginner to intermediate
593 pages
12h 12m
English
book
Raspberry Pi: Amazing Projects from Scratch
by Ashwin Pajankar, Arush Kakkar, Matthew Poole, Richard Grimmett
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter 4. Adding a Magnetic Contact Sensor
Now that we have built our port expander hardware, we need to learn how to program it so that our Raspberry Pi can detect the things that we connect to it as part of our home security system. We will begin by connecting switches to our system in the form of magnetic sensors—the most common component used in home security systems to detect intrusions through doors and windows.
In this chapter we will cover the following topics:
- Learning about reed switches and how they work as door sensors
- Enabling and setting up the I2C bus on the Raspberry Pi
- Connecting our sensor to an input on our port expander
- Learning how to access our I2C port expander from a Bash script
- Writing a script that will detect the state of ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.