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APPLICATION NOTE 104

Application Note 104

Minimalist Temperature Control Demo

FEATURES

DESCRIPTION

instrumentation with

The Minimalist Temperature Control Demo is a closed

loop 1–Wire MicroLAN control system. It consists of a

ready to use printed circuit board (Figure 1), a cable with

two RJ–11 connectors and a disk with software. In addi-

tion to this, the demo requires the DS9097 COM Port

Adapter

To run the demo, connect the circuit board to the

DS9097 adapter using the RJ–11 cable and plug the

adapter into the RS232 serial communication port of

your computer. Load the demo disk into the 3 1/2” disk

drive and start the program TEMPCONT.EXE.

•

Direct–to–digital, direct–to–PC

graphical user interface demo

•

Ready

to use temperature control demonstration

including piezo–sensor for sensing of mechanical

activity and LED to simulate opto–isolators

minimalist sensor chips and 1–Wire line–

powered MicroLAN

networking technique

TMEX–based software automati-

cally identifies devices and assigns communication

port

Addressable Switch as a Sensor/Actuator

•

Features

•

Self–configuring

•

Includes DS1820 1–Wire Thermometer and DS2407

TEMPERATURE CONTROL CIRCUIT BOARD DESCRIPTION

Figure 1

TO PC COM PORT

DS9097

COM–PORT ADAPTER

PIEZO SENSOR

RJ11

AMP LDTO–028K

CONNECTOR

DATA

GROUND

LED GREEN

“COOLER”

DS1820

TEMP. SENSOR

TELEPHONE

CABLE

1–CHANNEL DS2407

FOR PIEZO SENSOR

2–CHANNEL DS2407P

FOR HEATER/

COOLER CONTROL

LED RED

“HEATER”

JUMPER

SOFTWARE OPERATION

The demo program comes up with the Temperature

Control Graphical User Interface Tab (Figure 2). The

actual temperature is displayed in the center of the win-

dow. The value is read from the DS1820 Thermometer

and interpolated to the 0.1°C or

°F

resolution. A short

beep marks every new reading. On startup, the heater

and cooler trip points are close to the actual temperature

and the heater is running. One may change the trip

points up or down by clicking on the arrows. For this

demo, the heater trip point must be at least 1.0°C or

1.8°F lower than the cooler trip point. The demonstra-

tion assumes that one warms up the DS1820 by touch-

ing it with a finger. This will raise its temperature and

eventually switch off the heater, and, after some time,

switch on the cooler.

Movement of the Piezo–Sensor will result in the pro-

gram temporarily switching to the Piezo–Activity Tab

(Figure 3), where the Dallas Skyline appears every time

the piezo–sensor registers activity. To prevent the pro-

gram from automatically switching back to the Tempera-

ture Control Tab, press P. To return back to temperature

control, press T.

More information about the demo program is obtained

by clicking on the question mark or by displaying the

README.TXT file found on the demo disk.

The software will not work if the jumper is removed from

the circuit board.

030998 1/4

APPLICATION NOTE 104

GRAPHICAL USER INTERFACE TEMPERATURE CONTROL TAB

Figure 2

ACTUAL TEMPERATURE DISPLAY

CLICK HERE TO

SWITCH TO THE

PIEZO TAB

CLICK HERE TO

DISPLAY HELP

INFORMATION

CLICK HERE TO

SWITCH ON/OFF

THE SOUND

ACTUAL HEATER

TRIP VALUE

CLICK ON ARROW TO

CHANGE THE COOLER

TRIP POINT IN STEPS

OF 1°C OR 1.8°F

CLICK HERE TO TOGGLE BETWEEN

CELSIUS AND FAHRENHEIT

CLICK ON ARROW TO

CHANGE THE HEATER

TRIP POINT IN STEPS

OF 1°C OR 1.8°F

ACTUAL COOLER TRIP VALUE

GRAPHICAL USER INTERFACE PIEZO–ACTIVITY TAB

Figure 3

CLICK HERE TO

RETURN TO THE

TEMPERATURE TAB

CLICK HERE TO

SWITCH ON/OFF

THE SOUND

CLICK HERE TO

DISPLAY HELP

INFORMATION

030998 2/4

APPLICAITON NOTE 104

DEMO BOARD CIRCUIT DIAGRAM

Figure 4

DATA

RED

LED

RJ–11

GND

PIEZO

DS2407

PIO

DS2407P

PIO–A

PIO–B

GND

GREEN

LED

DS1820

Vdd

JUMPER

MINIMALIST TEMPERATURE CONTROL DEMO CONTENTS

Table 1

KIT PARTS LIST

DESCRIPTION

Demo Board

RJ–11 Cable

DS9097 COM–

Port Adapter

3 1/2” Demo

Disk

QUANTITY

SPECIAL DEVICES ON THE DEMO BOARD

PART NUMBER DISCRIPTION

DS1820

DS2407

DS2407P

LTDO–028K

Direct–To–Digital Temperature Sensor

one–channel Addressable Switch

two–channel Addressable Switch

AMP Piezo Sensor

for info call AMP at (610) 666–3545

QUANTITY

1–WIRE LINE–POWERED MICROLAN

Figure 5

030998 3/4

APPLICATION NOTE 104

DS2407 ADDRESSABLE SWITCH CONTROL PANEL REPRESENTATION OF ALL

RESOURCES AS VIEWED FROM PC

Figure 6

030998 4/4

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APP04.PDF (195 KB)
APP100.PDF (80 KB)
APP104.PDF (499 KB)

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