Circuit Cellar Ink 25
February/March 1992

Table of Contents

2 Ken Davidson	Editor's INK Change is Not in the Cards
4	Reader's INK Letters to the Editor
6 Harv Weiner	New Product News
12 Tricia Parks	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.
14 Ken Davidson	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.
22 Steve Ciarcia	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.
46 Ken Davidson	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
58 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
66 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.
74 Ed Nisley	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
82 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.
92 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.
100 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. Download: DIGSCOPE.ZIP
108 Ken Davidson	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.
111 Ken Davidson	ConnecTime -- Excerpts from the Circuit Cellar BBS
113	Advertiser's Index
128 Steve Ciarcia	Steve's Own INK The More It Changes, the More It Stays the Same

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