December 2013
Intermediate to advanced
394 pages
9h 43m
English
Content preview from Raspberry Pi HacksBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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. Hacking the Outdoors
Electronics outside, you say? Isn’t that a bad idea? We do have a couple of water-resistant suggestions ([Hack #39] and [Hack #40]). But we also have ideas for how to put your Pi to use on your outdoor projects, from monitoring your garden ([Hack #38]) to controlling your holiday lights ([Hack #45]).
Hack 37. Tell the Temperature Outside (Without Going Out There)
The outside temperature is not a constant value; it fluctuates, and we know you like to know what it is. Whether you’re helping plants stay healthy or just want to know how many layers of clothes to wear, this hack can help!
[Hack #5] shows that the Raspberry Pi measures the temperature of its BCM2835 system-on-chip, but this is different. In order to read the temperature near the Raspberry Pi (or even nowhere near it), you’ll need to connect a temperature sensor. While Linux supports some USB thermometers, it is just as simple (and arguably more fun), to wire up a simple temperature sensor to the GPIO on the Raspberry Pi.
This hack uses the Texas Instruments TMP102 I2C temperature sensor for the following reasons:
- It is very small. Smaller than a quarter. See Figure 4-1 for proof.
- It is a digital sensor (this makes the wiring much easier and the results much more accurate).
- Sparkfun sells it already connected to a breakout board.
- It is cheap (less than $6 USD at the time of this writing).
- It is accurate over a range of temperatures from -25°C and +85°C. (That’s -13° to 185°F.)
Figure 4-1. TMP102 ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.