Circuit Cellar Ink 25
February/March 1992

Table of Contents


Ken Davidson

Editor's INK

Change is Not in the Cards


Reader's INK

Letters to the Editor


Harv Weiner

New Product News


Tricia Parks

PDF The State of Home Systems

Where are we headed with home automation? Find out what one of the industry's leading marketing experts thinks is coming down the pike.


Ken Davidson

PDF Take a Tour of the Bright Home

Take a handful of home automation companies, add one model home, and you have the recipe for the first in-house CEBus showcase open to the general public.


Steve Ciarcia

PDF The Circuit Cellar Home Control System II

What is our favorite home automator up to these days? When he's not reminiscing about the good old days, he's dreaming up the future.


Ken Davidson

PDF The Home Control System II Supervisory Controller

Current home control systems have a level of functionality not seen in systems of a few years ago. The key building block and brain of the new Circuit Cellar HCS II leaves its predecessor in the dust.

Download: HCS120.ZIP


Mark E. Nurczyk, P.E.

Designing with the LM335 Temperature Sensor

Something as simple as a temperature interface can present a host of design problems. Find out how Mark handles such issues as system resolution and automated production calibration.

Download: LM335.TXT


Bob Krause

Isolation Amplifier Design Using the IL300 Linear Optocoupler

Traditionally, optocouplers are only used with digital signals. A new chip from Siemens makes it possible to use optocoupler isolation in analog circuits as well.


Ed Nisley

PDF Firmware Furnace

Two-Way Power Line Communication

The major portion of most of today's home control systems is power line communication. Ed shows us his version of an X-10 power line interface that can be used with the HCS II or in other applications.

Download: PLLINK.ZIP


Charles P. Boegli

Practical Algorithms

Simulating Dynamic System Responses

There are many parallels between mechanical and electrical systems. Understanding how to model dynamic mechanical systems can often increase understanding of other kinds of systems.


Jeff Bachiochi

From the Bench

Does It Come With a Memory ... Standard?

What happens when a standard is written to be everything to everybody? Share Jeff's adventures as he wades through the emerging credit-card-size module standards.


Tom Cantrell

Silicon Update

Cheap Chips -- Lean and Mean PIC Machines

What do you do when discrete gates aren't enough and a regular microcontroller is just too much? Pick a PIC and come out just right.



Ken Davidson

PDF Domestic Automation

CEBus Goes Coax -- Also Visit the Home of the Future

More and more of the CEBus specification is being accepted as an interim standard. Find out the latest on the CEBus front. Also check out another automated home on display.


Ken Davidson

ConnecTime -- Excerpts from the Circuit Cellar BBS


Advertiser's Index


Steve Ciarcia

Steve's Own INK

The More It Changes, the More It Stays the Same

FTP Directory for INK 25
Follow this link to order a copy of INK 25

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