Myalarm V-LED1 Manual de usuario descargar pdf (Pagina 4)

hardware integration on the

MC13192-SARD, the design of this

sensor was software only, but this pro-

vided an easy starting point to start

software development and quickly

implement a sensor for the validation

of the base unit’s reception abilities.

The garage door module uses the

Freescale MMA1260D 1.5-g z-axis

accelerometer included on the

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CIRCUIT CELLAR

Issue 194 September 2006

nected to the microcon-

troller through 5- to 3-V

logic level translation.

DTMF detection is per-

formed by a BG Micro

SSI204 DTMF detection

IC. Given more develop-

ment time, I would have

been able to implement a

DTMF detection routine

in software, but I

would’ve needed hardware

to amplify the incoming

phone line audio to a

range suitable for the

ADC on the GT60 proces-

sor. The SSI204 chip

interfaces directly to the

DAA audio output with nothing more

than a 0.1-µF capacitor.

GARAGE DOOR SENSOR

I started the remote sensor design

with the garage door module because

all of the required hardware was

already part of the MC13192-SARD

PCB, with one minor exception I will

discuss later. With the high level of

MC13192-SARD PCB to detect the

position of the garage door. The

MC13192-SARD periodically wakes

up, checks the accelerometer, and

sends an error code when –1 g (due to

the force of gravity) is seen. The PCB

must be mounted on the garage door

with the solder side toward the door

so that it is horizontal and upside

down on the raised garage door.

Figure 2

—

The MPX2010GS sensor measures the water level by the air pressure in the tube. The op-amp circuitry changes the differential

sensor signal to a ground-referenced signal and amplifies the signal to a range appropriate for the MC13192 SARD board’s analog input.

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