Circuit Cellar INK

#118 May—2000
EMBEDDED APPLICATIONS

FEATURES
A Reliable Network for Embedded Systems
Getting On TrackVal Popescu & Gary Gibson
Getting a low-cost and reliable embedded network on track can be quite a chore. Val and Gary put together a system of network nodes that is not only on track, but on the track—in a high-performance racecar! Let’s take a ride with LogNet.
pg.10

Keywords: Embedded Network, LogNet

The Shocking Truth About EMC
Part 2: Practical ApplicationGeorge Novacek
Having covered the principles of EMC in Part 1, this month George sets out to show us how to keep everything in mind when designing electronic equipment. If you design electronic equipment, here’s a handy ounce of prevention. pg.18

Keywords: EMC, electromagnetic compatibility, DO-160D, MIL-STD-461D, magnetic effect, power supply, interference, RF, lightning, emission, immunity

Weather Data
Getting More than One Wire's WorthWilliam Beals & Russell Chadwick
Russell and William rolled a weather station from Dallas and a Motorola 6808-based electronic interface display unit into an award-winning project in last year’s design contest. And now, here’s an inside look at how the project came together. pg. 28 (code)

Note: The URL for the software published in the magazine was incorrect, the correct URL is: http://ourworld.compuserve.com/homepages/wmbeals/

Keywords:  Weather Station, Dallas 1-wire

Buying Power
A Low-Cost Power SupplyRobert Kondner
If you’ve ever designed a small embedded system, only to find that the power supply costs more than the remaining components, you might want to take a closer look at Bob’s project and consider rolling your own power supply. pg. 32 (code)

Keywords: QuickConvert, Power Supply, LT1170, Magnetic Converters

Viewable ArticleBuilding a Risc System in an FPGA
Part 3: System-on-a-Chip DesignJan Gray
Now that the xr16 RISC processor is complete, it’s time to tie everything together and wrap up this series. In this final part, Jan designs a demo system that includes an on-chip bus, memory controller, video controller, and peripherals. pg. 36 (code)
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Keywords: FPGA, RISC, CPU, pipeline, xr16, interrupt, control unit

Embedded Living
HCS = Heating Control System?Mike Baptiste
It may be Spring now, but one cold snowy day back in January, Mike got to pondering about his new HVAC system and how to tie it into his home-control system. Soon, he had the “H”, “V”, and “AC” singing in harmony with his HCS. pg. 68

Keywords: Home Control, Heating Control, temperature control

COLUMNS
Viewable Article
MicroSeriesJoe DiBartolomeo
Op-Amp Specifications
Part 2: Getting Some Input
In Part 2 of this Micro-series, Joe discusses specifications for input offset currents and voltages, as well as input bias current. If low-frequency and precision applications are your thing, you won’t want to miss this. pg. 60
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Keywords: Op-Amp, operational amplifier, analog design, specifications, datasheet, feedback

Viewable Article
From the Bench
Jeff Bachiochi

Digital and Analog Output Control
Taking Route X-10
Call it quirky, call it temper-mental, call it mysterious, but you certainly can’t call X-10 useless. Jeff’s project sheds some light on controlling outputs via X-10. pg. 74 (code)
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Keywords:  X-10, PL-513, TW-523, DS1844-010

Silicon UpdateTom Cantrell
On the Road Again
Part 1: Going Places with Silicon

This month, Tom combines two interests and takes an under-the-hood look at the chips that reside under the hood. Peel back the chrome and leather and you’ll see how “smart” today’s cars really are. pg. 78

Keywords:  Automotive LANs, J1850, AU5780A, MC33390

EMBEDDED PC
Real-Time PCsIngo Cyliax
Real-Time Executive for Multiprocessor System
Part 1: Introduction to RTEMS
Ingo sets out to explain how the RTEMS open-source licensed real-time kernel has evolved from its days at U.S. Missile Command. You just might consider using the current C version to launch your next application. pg. 50

Keywords: GNU Tool Set, pc386 BSP

Applied PCsFred Eady
Under the Covers
Part 2: Applications via NT Embedded 4.0
If last month’s introduction to Windows NT Embedded 4.0 got you wondering what kind of applications are possible, you’re not the only one. Fred took the advice of some readers and considered Internet device control via emWare. pg. 54

Keywords: Windows NT Embedded 4.0, Little Board/P5x, Microdrive, Windows CE

 

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