ESE Lab

1
ESE Lab

• Computer based Temperature Control
• Sid Deliwala, ESE Labs

2
http//www.waltonemc.com/Newsletter_Archive/2002_0
2February.htm
3
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

4
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

5
Project Description

• Power supply
• Circuit to turn on/off heater and measure
  temperature
• Data acquisition board installed in the PC
• LabVIEW software

6
Power Supply
7
Protoboard Connections
8
Test the 47ohm resistor
9
Circuit building, temperature sensor
LM34
1 microfarad capacitor
10
Circuit building, heater control
5 volt relay pinout
DC fan
LM741 op amp pinout
11
Final Circuit
12
Computer Interface
Data Acquisition Connection On PC
13
DAQ board and analog to digital conversion
LabVIEW files have extension .VI (virtual
instruments)
14
(No Transcript)
15
LabVIEW control diagram
16
What you will get..

• Protoboard, jumper wires
• Parts packet
• PC based Temperature Control.VI file on the
  desktop of the PC