Circuit Cellar Ink 228
July 2009

Table of Contents


CJ Abate

HTML Task Manager

'Net Tech and You


John Gorsky

HTML New Product News


David Tweed

HTML Test Your EQ


Steven Nickels

Internet Weather Display

The Internet Weather Display is a weather station that operates without external sensors. The design gathers weather data and alerts from the Internet and displays it on a color TFT monitor. An LED flashes when alerts are transmitted.



Minas Kalarakis

Web Camera Design

This versatile web camera system can take a picture at a resolution of 640 x 480 or 320 x 240, pan the camera horizontally and vertically, and change its IP and gateway address to match a network. After each photo is divided into 64-byte segments, an Ethernet module transmits the packets over the Internet.



Kirt Weakman


An Ethernet-Controlled HERMS

After reading a 2006 Circuit Cellar article about the development of a heat exchange recirculating mash system (HERMS), Kirt set out to update his own Ethernet-controlled design. In this article, he describes how upgrading the system involved metal bending, TIG welding, MIG welding, embedded Linux code, VB.NET code, and more.



Enoch Hwang

Master Control

Implement an I2C Master Bus Controller in an FPGA

Enoch explains how to implement an I2C master bus controller using an FPGA. He presents the I2C bus protocol, and then describes how to build the controller using VHDL or Verilog code. The design accesses a real-time clock chip via the I2C bus and displays the time on a seven-segment display.


From the Bench


Jeff Bachiochi

Embedded Speak

A Text Library for Allophone Translation

Do you need to add text-to-speech capability to a project? If your design requires more than a few canned phrases (strings of allophone codes), you must build up the system's vocabulary. Jeff explains how to develop a text library for real-time translation.

Silicon Update


Tom Cantrell

LiOn King

A Look at "Battery-in-a-Chip" Technology

Got Energy? Energy harvesting is all the rage, but like a real harvest you need a place to store the crop. This month, Tom introduces the next advance in thin-film rechargeable lithium battery technology: a battery-in-a-chip.

Lessons from the Trenches


George Martin

C Start-Up

Get a C Program Up and Running

You've decided to try the C language and have a new design ready to go. Now it's time to get your embedded system up and running.



Crossword Puzzle


Advertiser's Index / August Preview


Steve Ciarcia

HTML Priority Interrupt

The Critter Chronicles

Bonus Article


Thomas Alldread

NimbleSig III

A New and Improved DDS RF Generator

The NimbleSig DDS generator was unveiled in a 2007 CIrcuit Cellar article. The "NimbleSig III" is the newest version of the design. Thomas describes the updated features and firmware.

Bonus Article


Peter McCollum

Sound Synthesis Made Simple

A Multi-MIPS Music Box

Peter recently entered the world of simple music synthesis. He built a compact electronic sound-generating box. The design features DC-to-DC converter circuitry, an EEPROM containing sequences of notes, 18 LEDs, and a microcontroller and audio circuitry.


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