The October issue of Circuit Cellar magazine is out next week! Smart Home technologies, Smart Farming, antenna arrays, rugged SBCs and COMs—this 84-page publication gathers up a great selection of embedded electronics articles for your reading pleasure.
Not a Circuit Cellar subscriber? Don’t be left out! Sign up today:
Here’s a sneak preview of October 2019 Circuit Cellar:
TECHNOLOGIES FOR A CONNECTED WORLD
Smart Home Technologies
By Jeff Child
The evolution of Smart Homes is about more than pure convenience. Smart Home technologies are leveraging IoT concepts to improve energy efficiency and security, thanks to intelligent, connected devices. The topic encompasses things like power-saving motor control systems, predictive maintenance, cloud-based voice assistance, remote monitoring and more. In this article, Circuit Cellar Chief Editor Jeff Child examines the MCU and analog ICs that are serving the needs Smart Home system developers.
MQ Telemetry Transport
By Jeff Bachiochi
Better known by the acronym MQTT, this lightweight messaging protocol is designed to minimize network bandwidth and device resource requirements. In this article, Jeff sets out to use MQTT via a cloud setup that he can do locally. For this, he turns to Eclipse Mosquitto, an open source message broker that implements the MQTT protocol. Jeff steps through the nitty gritty details of his implementation.
LoRa (Part 1)
By Bob Japenga
In this new article series, Bob discusses LoRa—the Long Range spread spectrum modulation technique that promises to solve a number of the key issues in fulfilling the wireless IoT requirements. In Part 1, Bob starts with an introduction to LoRa, looking at what it is, what are its limitations and how those limitations affect how we use this technology.
Smart Farming Device Gives Plants a Voice
By Andrei Florian
Smart Farming has many aspects, and among these the agriculture side. In this project article, Andrei discusses SmartAgro, a device that combines field autonomy with ease of use, allowing farmers to give their plants a “voice.” It lets you visualize the temperature, soil humidity, UV radiation and more wherever you are, in real time and take action when it is most needed—whether that means turning on an irrigation system or preparing for cultivation.
RESOURCES FOR ENGINEERS
Product Focus: Rugged SBCs
By Jeff Child
Single board computers are used in such a broad sweep of applications—some that must operate in harsh environmental conditions. Rugged SBCs offer a variety of attributes to serve such needs, including extended temperature range, high shock and vibration resilience and even high humidity protection. This Product Focus section updates readers on this technology trend and provides a product album of representative rugged SBCs.
An Intro to Antenna Arrays
By Robert Lacoste
As an expert in RF technology, Robert has deep knowledge about antennas. And in this era of IoT, his expertise more relevant than ever. That’s because every wireless device has some kind of antenna and these antennas are often the root cause of engineering headaches. With that in mind, in this article Robert discusses the math, technology and design issues that are basic to antenna arrays.
Using Digital Potentiometers
By Stuart Ball
A digital potentiometer probably can’t be considered the most glamorous of electronic components. But it is easy to use and versatile. In this article, Stuart digs into the uses, advantages and disadvantages of the digital potentiometer, including how they contrast to mechanical potentiometers.
Semiconductor Fundamentals (Part 2)
By George Novacek
In Part 1 George examined the basic structures that make semiconductors work. But a lot more needs to be said about diodes, which are a key element of semiconductors. In Part 2, George dives deeper, this time looking at the current flow, depletion layer and electron physics that are involved in diode operations. He covers various types of diodes and the details of their operations.
A Hardware Random Number Generator
By Devlin Gualtieri
Men first walked on the Moon fifty years ago. On the same week as that historic event, Dev divided his time between watching the event on television and building a unique desktop novelty circuit, a random digit generator. This circuit used a Nixie tube for display and a handful of TTL integrated circuits to implement a linear feedback shift register. In this article, Dev updates his original design using the CMOS digital circuits available today and a 7-segment LED display. He also presents an improved version that uses a Microchip PIC MCU.
MICRCONTROLLERS DO IT ALL
By Jeff Child
In contrast to microprocessors, microcontrollers tend to be used for specific applications. But even among MCUs, there’s distinct difference between general purpose MCUs and MCUs that are designed for very specific application segments, or even sub-segments. Circuit Cellar Chief Editor Jeff Child examines this class of MCUs that target everything from factory automation to appliance control.
The Laser Harp
By Alex Hatzis
Normally, you’d think that taking the strings out of a harp would be a downgrade. But in this article, Cornell student Alex Hatzis presents a system that does just that—replacing the harp strings with red lasers. Phototransistors are used to detect when the beams are intercepted by a person’s hand playing the harp, and some convincing real-time sound synthesis helps to create a new, high tech instrument.