November 2010
Intermediate to advanced
624 pages
18h 14m
English
Content preview from Real World Instrumentation with Python
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,
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.
USB Example: The LabJack U3
Technological advancements in USB devices have continued to drive the cost of I/O devices with a USB interface ever lower. Just five years ago devices with the capabilities of this new breed of I/O modules would have cost many hundreds or even thousands of dollars. Prices today range from around $100 and up, depending on factors such as speed, conversion resolution, and the type and quantity of I/O channels.
One low-cost device is the LabJack U3, which is shown in Figure 14-6. This data acquisition device provides discrete digital I/O, analog I/O, and counter/timer I/O. It uses a USB interface for all command and data response transactions.
Figure 14-6. LabJack U3 USB DAQ device
The U3 is powered from the USB interface. There is no provision for an external power supply, which is common for devices of this type. So even though there is +5 V DC available at some of the terminal positions, care should be taken not to draw too much current and cause the USB channel to go into shutdown.
LabJack Connections
Figure 14-7 shows a diagram of the U3’s connections. Many of the terminal points on the U3 can be configured for different modes of operation, and the configuration can be saved to ensure that the unit starts in the correct state at power-up. In addition to the terminal block connections, there is also a DB-15 connector that brings out 12 additional signal lines. ...
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.