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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Give me power
You'll remember from the previous chapter that most things to do with the GPIO operate on a +3.3V level, rather than the +5V level that is often associated with digital circuits. This is the same with our I2C-based shift registers—they need to operate on +3.3V levels as well, in order to work with the Raspberry Pi.
You'll also recall, however, that there's not much +3.3V juice available directly from the Raspberry Pi—in fact, just 50mA. This is really not enough for our interface. So, before we go any further, we're going to build our own +3.3V power supply, which is sufficient for our system.
For our power supply, we're going to use a basic 3.3V voltage regulator (type LD1117V33) that will take our slightly more plentiful +5V supply ...
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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.
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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.