Industrial Automation Using Data Acquisition 2

8/3/2019 Industrial Automation Using Data Acquisition 2

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WHAT IS DATA ACQUISITION?

y Data acquisition is the sampling of the real world togenerate data that can be manipulated by a computer.

y Sometimes abbreviated DAQ or DAS, data acquisitiontypically involves acquisition of signals and waveformsand processing the signals to obtain desiredinformation.

yThe components of data acquisition systems includeappropriate sensors that convert any measurementparameter to an electrical signal, which is acquired bydata acquisition hardware.


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BLOCK DIAGRAM

TEMPERATURE

TRANSDUCER

CIRCUIT

HUMIDITY

TRANSDUCER

CIRCUIT

LIGHT

TRANSDUCER

CIRCUIT

PRESSURE

TRANSDUCER

CIRCUIT

PROXIMITY/

LEVEL

TRANSDUCER

CIRCUIT

D

E

M

U

X

A

D

C

8

0

5

1

R

S

2

3

2PC

LIGHT

CONTROL

SYSTEM

TEMP.

CONTROL

SYSTEM

HUMIDITY

CONTROL

SYSTEM

PRESSURE

CONTROL

SYSTEMPROXIMITY/LEVEL

CONTROL

SYSTEM


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DEVELOPMENT OF PROJECT

The project is developed in following stages:

# Software Development:8051 Progrmming: KEILC

User Interface:VISUAL BASIC,MATLAB

# Hardware Development

PCB Design:Express PCH ,Eagle

We are using TDD(Test Driven Development) methodology forthe development of project, where we first develop the code, test

and simulate it and then burn it on the hardware.


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ANALOG INTERFACE SECTION OF THE

DATA ACQUISITION SYSTEM


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CIRCUIT DIAGRAM


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DISPLAYING MEASURED TEMPERATURE

y Using 8051 kit,the program written for sensing the

temperature was burnt on it and the output was observed onHyperterminal.

y For this purpose,we set the baud rate of 8051 to the baud

rate of PC.

yThe ambient temperature, and temperature of the loadresistor were all monitored via the data acquisition system.

After logging the octal numbers to a text file viaHyperTerminal.


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CODE FOR READING & DISPLAYING

TEMPERATURE

RD BIT P2.5

WR BIT P2.6

INTR BIT P2.7

MYDATA EQU P1

MOV P1, #OFFHSETB INTR

BACK: CLR WR

SETB WR

HERE: JB INTR, HERE

CLR RD

MOV A, MYDA TAACALL CONVERSION

ACALL DA TA_DISPLAY

SETB RD

SJMP BACK


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CONVERSION: MOV B, #10

DIV ABMOV R7, B

MOV B, #10

DIV AB

MOV R6, B

MOV R5, A

R

ET

DATA_DISPLAY: MOV P0, R7

ACALL DELAY

MOV P0, R6

ACALL DELAY

MOV P0, R5

ACALL DELAY

RET


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HYPERTERMINAL INTERFACE


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SETTINGB

AUDRATE


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The plot below shows the results of loading the supply with three different values ofload resistors. As expected the supply voltage sags with decreasing resistance. The

output current changes from 400mA to about 1A over the three different resistors.

Finally, the temperature of the load resistor peaks at about 55 degrees Celsius. This

simple application example shows the utility and some of the capabilities of the data

acquisition system.


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MICROCONTROLLER INTERFACING

WITH RS-232 STANDARD DEVICES


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IMPROVEMENTS REQUIRED AT

CURRENT STAGEy This data acquisition system, while functional, could be improved.

y An improved voltage measurement input is also desired.

y Currently, the system can only measure positive ground referencedvoltages. With a true differential amplifier input, positive and negativevoltages could be read without the fear of shorting a measurementchannel to ground.

y On the software side two major improvements are warranted.

y First, the capability to display real-time values of the captured datawould greatly increase the utility of the data acquisition system.


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y Next, an integrated capture and display program would greatly simplifydata capture.

y The current system requires capturing data via HyperTerminal .

y The current solution is far from a one-click data capture. Withdedicated software it is possible that a single click would enable a userto view live data and concurrently save the trend data to a file.


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FUTURE PLAN

y 8051 microcontroller along with ADC 0808 has been used so farfor the design of the project. Additionally, it would be necessaryto learn the development environment, compiler, and device

programmer.

y We plan to use a Visual Basic interface to show the calculatedtemperature,pressure and humidity.

y Also ,for making in automated project,several hardware such asautomatic switching fan and automatic humidity & pressurecontrolled devices will be integrated using Interrupts of 8051Microcontroller.


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FEW SNAPSHOTS OF OURTESTING SESSION


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THANK YOU!!!

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Industrial Automation Using Data Acquisition 2