Specialized Linux File Systems

Figure 1: An example of a network file system is shown.

Since Linux was released in 1991, it has become the operating system for “98% of the world’s super computers, most of the servers powering the Internet, the majority of financial trades worldwide, and tens of millions of Android mobile phones … Continue reading

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Raspberry Pi-Based Network Monitoring Device

The Raspberry Pi’s final installation is shown. The clear acrylic case can be seen along with the Texas Instruments TMP102 temperature sensor, which is glued below the air hole drilled into the case. We used a modified ribbon cable to connect the various TMP102 pins to the Raspberry Pi.

In 2012, Al Anderson, IT director at Salish Kootenai College in Pablo, MT, and his team wired the dorms and student housing units at the small tribal college with fiber and outdoor CAT 5 cable to provide reliable Internet service … Continue reading

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Pulse-Shaping Basics

Directly transmitting a raw digital signal, such as this 1-Mbps non-return-to-zero (NRZ) stream (at top), is a waste of bandwidth. b—Using a pulse-shaping filter (bottom) reduces the required bandwidth for the same bit rate, but with a risk of increased transmission errors.

Pulse shaping (i.e., base-band filtering) can vastly improve the behavior of wired or wireless communication links in an electrical system. With that in mind, Circuit Cellar columnist Robert Lacoste explains the advantages of filtering and examines Fourier transforms; random non-return-to-zero … Continue reading

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A Trace Tool for Embedded Systems

This is the trace dongle.

Tracing tools monitor what is going in a program’s execution by logging low-level and frequent events. Thus tracing can detect and help debug performance issues in embedded system applications. In Circuit Cellar’s April issue, Thiadmer Riemersma describes his DIY tracing … Continue reading

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WIZnet Announces WIZ550io & W5500 Discounts at EELive

Wiznet-Challenge-EELive

Today at EELive! in San Jose, CA, WIZnet announced a special promotion tied to the WIZnet Connect the Magic 2014 Design Challenge, which it is sponsoring. For a limited time, WIZnet is offering discounted WIZ550io Ethernet controller modules and W5500 … Continue reading

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