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Issue #258 January 2012— Embedded Applications
You can purchase full issues of Circuit Cellar in Print or Digital formats, single articles, and archive CDs in the webshop. Click Here |
Task Manager
Embedded Endeavors in 2012, by C. J. Abate
Priority Interrupt
Too Many Layers, by Steve Ciarcia
New Product News
FEATURE ARTICLES
A Different Timeshare
Build a Timeserver System
by Dave Penrose (USA)
You can build a timeserver that listens to a GPS signal, extracts the time and date, and retransmits this information to remote systems. The design manages more than one microcontroller that has a real-time clock with an I2C interface and keeps all the clocks synchronized. p. 14
mbos
A Real-Time Operating System for mbed
by Andrew Levido (Australia)
This project enhances the NXP Semiconductors mbed environment with a real-time operating system (RTOS). Designed specifically for mbed, "mbos" is a true preemptive multitasking RTOS that's scalable to support virtually any project developed on the NXP Semiconductors LPC1768 platform.
p. 24
The SMD Air Bath
A DIY PCB Preheating Setup
by Steve Johnson (USA)
The SMD Air Bath is a temperature controller that can preheat a surface-mount device printed circuit board assembly before reflow with a hot air pencil. The preheating capability activates the flux, reduces the chance of thermo shock, relieves the heat load from the hot air pencil, and reduces thermo-mechanical stresses
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p. 36
Questions & Answers
Innovative Research & Design: An Interview with Mike Smith
by Nan Price (USA)
Mike Smith is a professor of Computer Engineering at the Schulich School of Engineering, University of Calgary, Canada. His main interests are in developing new biomedical engineering algorithms and moving them onto multicore and multiple-processor embedded systems in a systematic and reliable fashion. Mike recently became a convert to the application of Agile Methodologies in the embedded environment. Mention "test-driven development" and his eyes light up. In 2011, Mike had his Analog Devices University Ambassadorship renewed for the eleventh straight year. In December, Mike and I discussed his interests and some of his students' projects.—Nan Price, Associate Editor
p. 46
COLUMNS
LESSONS FROM THE TRENCHES
ADCs and Signal Filtering
by George Martin (USA)
You understand the process of creating a new product from start to finish. Now it's time to dig into the specifics, starting with analog-to-digital converters and their supporting hardware and software. Many of the techniques in this article can be applied to other design dilemmas.
p. 50
THE CONSUMMATE ENGINEER
Build a Robust Power Supply (Part 1)
Power Dissipation
by George Novacek (Canada)
Building a robust power supply design seems like an easy task. The first part of this series on power supply design focuses on switching regulator modules, power dissipation, and low-voltage operation.
p. 56
EMBEDDED UNVEILED
Digital X-Ray Sensors
by Richard Wotiz (USA)
Ever wonder how X-rays work? Here's a detailed look at imaging techniques, from their early inception to today's advances. You'll also learn how a CMOS imaging sensor functions. p. 60
FROM THE BENCH
Quantifying Precipitation
Construct a Device to Measure Rainfall Volume
by Jeff Bachiochi (USA)
This tip-bucket mechanism uses a Hall-effect sensor and a microcontroller with debugging capability, LEDs, and configuration jumpers to measure rainfall volume. The sensor's open-collector output is connected to the microcontroller's interrupt input
. p. 68
You can purchase full issues of Circuit Cellar in Print or Digital formats, single articles, and archive CDs in the webshop. Click Here |
PREVIEW
Issue #259 February 2012 — Wireless Communications
◊ QRSS-Rx: A Network for Radio Communication
◊ KartTracker: GPS-Based Vehicle Timer
◊ NakedCPU (Part 1): A Roadmap for Navigating Hardware Documentation
◊ EMBEDDED IN THIN SLICES Getting Started with Embedded Linux (Part 3): Linux Licensing Issues
◊ THE CONSUMMATE ENGINEER Build a Robust Power Supply (Part 2): Abnormal Surge Voltage
◊ FROM THE BENCH Multi-Serial Protocol Tool
◊ ABOVE THE GROUND PLANE RFI Bypassing (Part 1): Capacitor Self-Resonance
◊ THE DARKER SIDE Playing with High-Speed ADCs
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