ESE Lab

Computer based Temperature Control

Sid Deliwala, ESE Labs

http://www.waltonemc.com/Newsletter_Archive/2002_02February.htm

Computer based temperature control

Advantages Adjustable software controlled

temperature range Logging of all acquired data Graphical interface Several sensors can be connected to

the controller

Requirements

Temperature sensor with a voltage output

A device to convert sensor output voltage to digital format (daq board)

Software (LabVIEW) A hardware interface to turn the

heater on/off

Project Description

Power supply Circuit to turn

on/off heater and measure temperature

Data acquisition board installed in the PC

LabVIEW software

Power Supply

Protoboard Connections

Test the 47ohm resistor

Circuit building, temperature sensor

LM34

1 microfaradcapacitor

Circuit building, heater control

LM741 op amppinout

5 volt relay pinout

DC fan

Final Circuit

Computer Interface

DataAcquisitionConnectionOn PC

DAQ board and analog to digital conversion

LabVIEW files have extension .VI (virtual instruments)

LabVIEW control diagram

What you will get..

Protoboard, jumper wires Parts packet PC based Temperature Control.VI

file on the desktop of the PC