Circuit Cellar Ink 237
April 2010

Table of Contents

4


CJ Abate

HTML Task Manager

New Development

8


John Gorsky

HTML New Product News

17


David Tweed

HTML Test Your EQ - Answers for Issue 236

18


Jeff Shoemaker

Converter Performance Management

Design Tips for Working with On-Chip ADCs

When creating an application that uses a microcontroller's integrated ADC, you need to know how all the parts (e.g., sensors) can affect the system's overall performance. This article includes design tips for getting optimal performance from an on-chip ADC.

From the Bench

26


Jeff Bachiochi

Read-Only Memories

Audio Applications with a Playback IC

If you want to bring useful audio recording capabilities to an embedded design, try working with a playback integrated circuit. It's easy once you resolve any memory issues associated with your design. This article details how to use a microcontroller to access a playback IC and associated EEPROM to play prerecorded audio files.

38


Peter Montgomery

Serial Network Hub

Part 2: Circuit Design and Usage

You are well on your way to building a six-port RS-485 hub that can implement a network packet system. Here you learn the details about the software and hardware, as well as some hidden "gotchas" present in RS-485 chips.

Download: Montgomery-237.zip

46


Alexandre Ney Guimaraes

Smart Control

An Innovative Approach to Reflow Soldering

This new approach to reflow soldering incorporates a toaster with a controller built around an LM3S102. The system features a simple graphical display and buttons for starting the cycle.

Download: Guimaraes-237.zip

Above the Ground Plane

54


Ed Nisley

Totally Featureless Clock

Part 2: Hardware

The first part of this series about a "totally featureless clock" detailed how to build a WWVB simulator. This article covers the clock's hardware and overall design.

Download: Nisley-237.zip

The Darker Side

62


Robert Lacoste

Picoammeter Design

If you occasionally work with low currents, you should have a picoammeter on your workbench. With some perseverance and a little know-how, you can build one in a couple of hours. But first you need a good understanding of current measurement and transimpedance amplifiers.

Download: Lacoste-237.zip

Silicon Update

68


Tom Cantrell

Wizard Lizard

Start Working with a Multidimensional SBC

Small SBCs are a dime a dozen, so what sets one apart from another? Sure, the hardware capabilities are important, but most SBCs cover the basics. However, there's more to the story than the spec sheet. Check out the Chameleon, a colorful controller that proves two heads are better than one.

74

Crossword Puzzle

78

Crossword Puzzle - Answers for Issue 236

79

Advertiser's Index / May Preview

80


Steve Ciarcia

HTML Priority Interrupt

Drive-by-Wire Roulette

Bonus Article

85


Stefan Negru

The FeelTagged System

An Arduino-Based HCI Project

With Arduino board, some programming skills, and a little imagination, you can create some pretty futuristic HCI projects. This article covers how to communicate human emotions on a 2x16 LCD.

Download: Feeltagged

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