Circuit Cellar Ink 29
October/November 1992

Table of Contents


Ken Davidson

Editor's INK

A Look at Next Year


Harv Weiner

New Product News


Brian Farmer

Planting Geraniums by Robot

Build an MC68HC11-based 2-D Sensor

What do you do when you need a sensor for an application nobody has thought of? Build your own. This unique sensor helps a robot prevent damage to delicate plant cuttings when handling them.

Download: ROBOT.ZIP


Brian Kenner
John Wettroth

The Design of a Time Domain Reflectometer

As anyone who's tried to track down an elusive network cabling problem knows, improper termination and bad cables are common culprits. Let this time domain reflectometer make your life a little bit easier.

Download: TDRSRC.ZIP


Jim Schimpf

Serial I/O on the IBM PC

As anyone who's tried to write serial support code for an IBM PC knows, the BIOS routines just don't cut it when trying to keep up with multiple high-speed ports. Jim's package replaces the BIOS with capable routines.

Download: SERCOM.ZIP


Bill Houghton

Add Text Overlay to Any Video Display

All the latest VCRs have on-screen programming in an effort to simplify the notorious task. Now you can have your HCS II or any other computer send you messages while you're watching your favorite TV show.

Download: TVLINK.ZIP


James R. Furlong

The Virtues of the Hue, Lightness, Saturation Color Model

If you thought RGB (red, green, blue) was the only (or best) way to represent color, think again. The Hue, Lightness, Saturation (HLS) model can actually be better than RGB at representing colors in some applications.

Download: MYPALZ.ZIP


Michael Swartzendruber

Driving Multiple VGA Monitors

Monitor extenders costing hundreds of dollars are available that allow you to drive multiple monitors with a single display adapter. Michael uses just a touch of ingenuity to bring down the price considerably.


Ed Nisley

PDF Firmware Furnace

Extending Your Control: The HCS II MCIR-Link

Since the introduction of the HCS II home control system, one of the most requested new features has been the ability to send IR codes to consumer electronic equipment. The new MCIR-Link makes those requests reality.



Jeff Bachiochi

PDF From the Bench

X-10 Interfacing with PLIX

The TW523 might be considered by some to be the perfect X-10 computer interface. The complicated timing can be daunting to many, though. Throw a PLIX chip at the circuit and your troubles may be solved.


Tom Cantrell

Silicon Update

I'm 18.432 -- and I Like It

Some people just can't get enough horsepower out of their processors, and Tome is certainly one of them. Zilog's newest speed demon runs the faithful Z180 (HD64180) up to 18.432 MHz and beyond.


John Dybowski

Practical Algorithms

The Middle Ground -- Negotiating a Keyboard Interface

Much of the computer engineer's life is spent making tradeoffs between doing things in hardware and doing them in software. John looks at several options available when designing a keyboard interface.


Ken Davidson

ConnecTime -- Excerpts from the Circuit Cellar BBS


Advertiser's Index


Steve Ciarcia

Steve's Own INK

Let Me Tell You About Yourself

FTP Directory for INK 29
Follow this link to order a copy of INK 29

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