Circuit Cellar Ink 226
May 2009

Table of Contents


CJ Abate

HTML Task Manager

Old Tech, New App


John Gorsky

HTML New Product News


David Tweed

HTML Test Your EQ


Dale Wheat

Smart Lead-Acid Battery Meter

An MCU-Based "Gauge" for SLA Batteries

Think sealed lead-acid (SLA) batteries are a thing of the past? Think again. They are bound to be around for years to come. Dale designed a state-of-charge meter for his SLA batteries. His multicolored LED meter simplifies battery charge testing.



DJ Delorie

Construct a USB GPIO Pod

Part 2: USB JTAG Module

In the first part of this article series, DJ presented a general-purpose input/output (GPIO) pod that can plug into a USB port. Now he describes how to download a JTAG programming application and program a CPLD circuit.


Andrew Mitz
Jon Daley

DOS in the 21st Century

A USB Flash Drive Reader for MCUs Works for DOS

With a little effort, you can turn DOS into a handy real-time operating system. As Andrew and Jon explain, it can be the perfect fit for embedded applications that may require too many resources for a single-board microcontroller. Read on to learn how this USB flash drive reader for DOS can enhance your future embedded applications.



Tom Struzik

Transformerless Power Supply

Instead of buying expensive transformers or converters to run your simple circuits, try using a transformerless power supply. Tom used one to construct a switch that controls lights in a pantry. When the door is opened, a processor senses a reed relay and powers up the outlet. Three minutes later, if the door is not closed, the outlet shuts off.


From the Bench


Jeff Bachiochi

A World Without NTSC

Bridge the Gap Between NTSC and VGA

NTSC will soon be a thing of the past. So, what will you do in a world without the NTSC? Jeff answers that question and more. Read on to learn how he is using a chip to bridge the gap between the NTSC and VGA formats.

Lessons from the Trenches


George Martin

FAT File System Review

Part 2: C Code for the File System

Now that you're familiar with the FAT file system, George approaches the subject from a different angle. By presenting you with a general-purpose FAT file system, he challenges you to remove the features you don't need and customize your application.


Silicon Update


Tom Cantrell

Whistle While You Work

A Look at a Modern DSP

Remember your father's DSP? Well, the Texas Instruments Piccolo isn't it. Tom presents this "DSP in disguise" and describes how you can use it to handle signal-processing applications such as switcher power supplies and other handy applications.


Advertiser's Index / June Preview


Steve Ciarcia

HTML Priority Interrupt

It's All Aboutthe Content, Stupid!

Bonus Article

Michael R. Smith
Lizie Dunling-Smith

Time-Triggered Systems

Part 2: A Tool for Automating Analysis

Now that you're familiar with the topic of co-operative scheduling, it's time to move on to the topic of adding a GUI to a co-operative scheduler. The end goal is the development of an interesting multitask audio device, a modern Theremin.
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