Circuit Cellar Ink 239
June 2010

Table of Contents


CJ Abate

HTML Task Manager

Embedded Is Everywhere


John Gorsky

HTML New Product News


David Tweed

HTML Test Your EQ - Answers for Issue 238


Chris Cantrell

Custom Interpreter Development

An Innovative LED Movie Project

Ready to make movies? Here you learn how to create two specific CPUs, each with its own unique language: one for movie frames and one for music. The design reads movie frames from an SD card and displays them on a 48 x 32 LED display while generating music with six independent voices.


Intelligent Energy Solutions


Stefan Siegel

Home Automation for an Energy-Efficient House

Part 2: Embedded CANOpen Node Hardware & Software

The first part of this series introduced a home automation system an for energy-efficient house. This article covers the embedded hardware and software for the nodes. You can use similar parts and design techniques to automate the building of your choice.



Chris Paiano

OAE Probe Amp and Intercom

Part 2: Otoacoustic Experiments

You are familiar with the process of designing and building an OAE probe amp and intercom system. Now you can perform otoacoustic experiments. Doing so will give you a good grounding in the study of otoacoustics and prepare you for future audio projects.


Above the Ground Plane


Ed Nisley

Totally Featureless Clock

Part 3: Signal Processing

You are well on your way to building a "totally featureless clock." You understand the hardware and how to build a WWVB simulator. This article details how firmware converts a received pulse stream into time codes, validates the codes, and ensures that the clock displays the correct time.


The Darker Side


Robert Lacoste

DC/DC Converter Basics

Inductors can be difficult to understand, let alone put to good use. This article bridges the gap between inductor theory and the practice of using inductors to build efficient DC/DC converters.


From the Bench


Jeff Bachiochi

Application Communication with USB

Part 1: The Enumeration Process Explained

Consumers understand how to use USB technology. Developers must understand how it works. This article series is an excellent starting point. Here you learn how a USB device goes through a number of states as it progresses through the enumeration process.

Silicon Update


Tom Cantrell

Pitch the Switch?

The basic design of the mechanical switch -- two conductors and a contact -- is hundreds of years old. How many switches get sold every year? Wow, that's a big number. Now Atmel says it's time to rethink the obvious. Is it time to pitch the switch?


Crossword Puzzle


Crossword Puzzle - Answers for Issue 238


Advertiser's Index / July Preview


Steve Ciarcia

HTML Priority Interrupt

Is It Cheating or Is It Collaboration?

FTP Directory for INK 239
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