Circuit Cellar Ink 232
November 2009

Table of Contents


CJ Abate

HTML Task Manager

You're Covered


John Gorsky

HTML New Product News


David Tweed

HTML Test Your EQ


James Stephanick

Embedded Linux-Based Location System

You can build your own vehicle location device without breaking the bank. This article details how to use a few readily available parts -- an ARM-based USB network storage link, a prepaid GSM cell phone, and a USB-GPS device -- to build an easy-to-configure location system.



Noel Rios

Energize a Circuit

An Innovative Switched-Mode Power Supply Design

Energy control is an essential aspect of many electronic applications. If you build a switched-mode power supply (SMPS), you can regulate a design's current to meet your specific project goals.



Carl Stoesz

Precision Linear Encoder Display

Linear encoders are essential parts in many industrial automation applications. Here you learn how to mount an optical linear encoder to a metal lathe used to create small precision parts. A few affordable parts and some C code enable you to transmit vital displacement and speed data to an LCD.



Cyrille de Brebisson

How to Repurpose a Development Platform

With some knowhow and a little bit of creativity, you can pop open an HP financial calculator and use its electronics to develop a variety of special-purpose applications. This article shows you how to use the calculator's screen, keyboard and PCB as a development platform.

Lessons from the Trenches


George Martin

Passing Parameters

How do you partition a design problem into manageable modules? With this article, you'll learn why it's smart to pass parameters in the first place, and then find out how to pass parameters and receive results with the C language.



Dennis Seguine

Low-Distortion FSK Generation

This article demonstrates a means to generate FSK modulation with low distortion and low transition phase error. You can use a PSoC's digital and analog block features and zero run-time software to achieve this goal.

Silicon Update


Tom Cantrell

Power Pitcher

Wireless Power on a Microelectronic Scale

Nikola Tesla's century-old dream of wireless power delivery is coming true, at least for chips. This month, Tom looks at a system from PowerCast that delivers power via radio waves. Combine it with low-power silicon and you can cut the wires, and ditch the wall warts, once and for all.

From the Bench


Jeff Bachiochi

Device Management

Monitor Networked Devices Via SNMP

The simple network management protocol (SNMP) enables you to monitor a network's activity and stock data units in a management information base (MIB). Today, many embedded microcontroller manufacturers provide SNMP support in their TCP/IP stack offerings. You can use this technology to build an MCU-based managed device that monitors multiple networked modules and logs critical data.


Crossword Puzzle


Advertiser's Index / December Preview


Steve Ciarcia

HTML Priority Interrupt

Keeping the Lights On

Bonus Article


Neil Forcier

Measuring Propagation Delay with a Universal Counter

Have you lost interest in universal counters? It's time to reexamine their use value in comparison to more expensive oscilloscopes. This article details how a counter makes a signal path delay measurement, the level of precision possible with a counter, and more. You'll also learn to identify and eliminate error in your measurement setup.
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