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CIRCUIT CELLAR

®

Issue 194 September 2006

37

Carl Smith (cdsmith@engineer.com)

has more than 12 years of experience

in electronic engineering design. He

has worked on everything from high-

current DC motor controllers to desk-

top computer components. Carl

earned a B.S.E.E. in 1992 and an

M.B.A. in 1994 from North Dakota

State University, but has been tinker-

ing with electronics since his age was

measured in single digits.

PROJECT FILES

To download the code, go to ftp://ftp.

circuitcellar.com/pub/Circuit_Cellar/

2006/194.

SOURCES

AD822 Op-amp

Analog Devices, Inc.

www.analog.com

RESOURCE

M. Clifford, “Water Level Monitoring,”

Freescale Semiconductor, AN1950,

rev. 3, 2004.

SSI204 DTMF Detection IC

BG Micro

www./jointfilesconvert/331223/bgmicro.com

CH1837 DAA

Cermetek Microelectronics, Inc.

www.cermetek.com

MPXM2010GS Pressure sensor,

MC13192 EVB, MC13192 SARD, and

Simple MAC software

Freescale Semiconductor, Inc.

www.freescale.com

Emic Text-to-speech module

Grand Idea Studio

www.grandideastudio.com

LT1081 RS-232 Dual driver/receiver

Linear Technology Corp.

www.linear.com

LM34 Precision Fahrenheit sensor

National Semiconductor

www.national.com

ULN2003 Darlington array

ST Microelectronics

www.st.com

perhaps with a metal detection cir-

cuit. I also want to add smoke, carbon

monoxide, and combustible gas sen-

sors. A sensor that can detect when

burners on my kitchen stove are in

use would be useful too.

PEACE OF MIND

This project turned out well for my

first wireless design and my first

attempt at using a Freescale HC08

microcontroller. The combination of

the MC9S08GT60 microcontroller,

the MC13192 RF transceiver, and the

Simple MAC software enabled me to

rapidly develop a complex wireless

system capable of monitoring several

useful remote sensors. I built the sys-

tem quickly without the worries of

complicated RF design issues. As a

result, I was able to focus on develop-

ing the rest of the system.

Now you can build your own sys-

tem. Hopefully, it will give you some

peace of mind when you’re away

from your house. Just think: now

you can check for problems anytime

you want. I

2609016 Smith.qxp 8/4/2006 2:19 PM Page 37

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