Myalarm V-LED1 Manuel d'utilisateur télécharger pdf (Page 2)

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CIRCUIT CELLAR

Issue 194 September 2006

MC13192-EVB when a remote sensor

reports an error condition. You can

press S1 for a summary report from

the speech synthesizer. The system

plays a message, “Everything is OK,”

when the remote sensors don’t report

errors. It mentions errors if they

occur. For example, if a garage door

sensor programmed as device number

two senses an open door, the system

says, “Garage door two is open.” You

can press S2 for a full report, which

sounds something like, “Garage door

one is closed. Garage door two is open.

Temperature sensor one is OK. Water

level sensor one is OK.”

When you’re away from home, you

can check the status of the system by

calling the phone line attached to the

base unit. After several rings the base

unit will pick up the phone line and

ask for your security code. You’ll then

enter your code (programmed during

the setup phase) using the touch-tone

buttons on your phone. The system

will time out and hang up the line in

10 s if you don’t respond to the

prompts; it will hang up if you enter

an incorrect code.

When you enter the correct code,

the system automatically provides you

with a short summary report. After

that, the system tells you to press 1

for the full report or 2 to terminate

the call. If you press 2 or don’t respond

to the prompt in 10 s, the system says

“goodbye” and hangs up.

GARAGE DOOR MODULE

Installing and setting up the garage

door module is easy. When the unit is

powered up, it flashes all four LEDs so

you know that programming is required.

The network number is entered first

using S101 to cycle through 1 to 15.

The currently selected number is dis-

played in binary on the four LEDs.

When the desired number is reached,

S102 enters the selection.

Next, the unit flashes three of the

LEDs so that you know to enter the

device number. You select the device

number the same way you select the

network n

umber. After entering the

device number, the unit blinks all of the

LEDs three times to let you know that

programming is complete and the device

is going into normal operating

mode.

Device numbers should be unique

for each type of sensor, but they don’t

have to be unique across all of the sen-

sor types. The garage door sensor

should be mounted on the inside of

the garage door with the solder side of

the Freescale MC13192 SARD PCB

facing toward the door. When the door

is open and horizontal in the upper

track, the component side of the PCB

should face downward.

WATER LEVEL MODULE

For the water level sensor module,

you must program the network number

and device number. The module blinks

two LEDs to indicate that you must

prog

ram the trip point. Press the S101

switch to start the trip point calibration.

LED1 blinks rapidly to indicate the

level programming mode. The rate of

blinking slows as the sensor tube sub-

merges deeper in water. This enables

you to test the sensor.

When dealing with a sump pump

hole, where filling the hole with water

during the calibration process isn’t

practical, you can calibrate the sensor

with a glass of water. Use a marker or

a piece of tape to mark the desired

depth on the sensor tube and then

submerge it up to that point in the

glass of water. Press S102 to set the

trip point. You can then move the sen-

sor and tube into the sump hole.

Mount the tube so the marked point is

at the level where an alarm is desired.

TEMPERATURE MODULE

To program the temperature sensor

module, set the network number and

device number in the same way you

set the garage door sensor. Following

this, set the upper and lower tempera-

ture limits. LED1 and LED2 flash to

prompt you to program of the upper

temperature limit tens digit. Press S101

to cycle the value and S102 to ente

LED3 and LED4 blink to indicate

that the upper limit ones digit should

be entered in the same manner. The

two inner LEDs prompt the entry of

the lower limit tens digit. The outer

two LEDs are for the entry of the

lower limit ones digit.

That’s it. When you’re done pro-

gramming, you can place the tempera-

ture sensor in the area that you want

to monitor.

HARDWARE DESIGN

The base unit is the most compli-

cated design in the system. It must be

able to receive and store the messages

from the remote sensors, provide syn-

thesized audio output (for status

reports, prompts, and menu selec-

tions), recognize DTMF tones to

respond to the menu selections, and,

of course, interface to the telephone

line in order to answer incoming calls.

The MC13192-EVB PCB that came

with the contest kit is the main part of

the base unit. It’s mounted on a proto-

typing perfboard, where the rest of the

circuitry was constructed with point-to-

point wiring techniques (see Photo 1).

The MC13192-EVB provides 5 V to

the rest of the circuitry with a tap

into the S106 power switch leads (see

Figure 1, p. 32). The I/O from J107 is

connected to the prototyping board via

a ribbon cable. The serial port at J103

is connected to the perfboard with a

D-sub connector to interface to the

speech synthesizer module.

A Grand Idea Studio Emic text-to-

speech module (distributed by

Parallax) provides the speech synthesis

functions. The module supplies high-

quality speech synthesis, and it inter-

faces with a standard TTL serial inter-

face at 2,400 bps. Its connections to the

microcontroller include a SERIAL IN, a

SERIAL OUT, and a BUSY line to indi-

cate when the module is busy speak-

ing and cannot respond to commands.

The Emic uses TTL voltage levels

for the serial input and output rather

than the full RS-232 voltage levels

output by the MC13192-EVB. This

Photo 1

—The base unit’s MC13192-EVB and EMIC

module were mounted on a standard perfboard. The

rest of the unit was built with point-to-point wiring tech-

niques on the perfboard.

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