Data Acquisition Using ARM7

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DRK College of Engineering &Technology

DATA ACQUISITON USING ARM

Project-19-4-2012

Department of Electronics & CommunicationEngineering

DATA ACQUISITON USING ARM




DATA ACQUISITION USING ARM7

Project-19-4-2012


Data acquisition is the process of sampling signals that

measure real world physical conditions and converting theresulting samples into digital numeric values that can be

manipulated. Data acquisition systems abbreviated with

the acronym DAS or DAQ





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The components of data acquisition systems include:

•Sensors

•Signal conditioning

•Analog-to-digital converters

•Display unit

Components of Data Acquisition System





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SIMPLE DAS





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ARM7

TDMI

LPC2148

Temperature

Sensor

Humidity

Sensor

Power Supply

16 X 2

LCD unit

MAX-232

IC

Computer

Block Diagram





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230v ACmainssupply

12v DCRegulatedpowersupply

Power Sup

ply





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ARM

ARM is a 32-bit reduced instruction set computer (RISC)

Instruction set architecture (ISA) developed by ARM Holdings

It was named the Advanced RISC Machine and, before that, the Acorn RISC

Machine.

On April 26th, 1985, ARM was first developed by Acorn Computers





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Why ARM??

Core Performance-ARM 7 and ARM 9 support 300

MIPS (Million Instructions per Second)

Wide Support

Low Power Consumption

Various special features





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ARM Versions

Architecture Family

ARMv1 ARM1

ARMv2 ARM2,ARM3

ARMv3 ARM6,ARM7

ARMv4 STRONG ARM, ARM7 TDMI, ARM9 TDMI

ARMv5 ARM7EJ, ARM9E, ARM10E, XSCALE

ARMv6 ARM11, ARM CORTEX-M

ARMv7 ARM CORTEX-A, ARM CORTEX-M, ARM CORTEX-R

ARMv8 No cores are available. Will supports 64-bit data and

addressing





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ARM7 Family





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ARM7 TDMI

• The ARM7 TDMI is based on ARM7 Core

– 3 Stage Pipeline

– Von Neumann Architecture‐

T – Thumb instruction Sets

D – Includes debug extensions

M – Enhanced Multiplier, yield a full 64-bit resultI – Core has Embedded ICE logic extensions


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BLOCK DIAGRAM





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PIN DIAGRAM





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Low Profile Quad Flat Pack (LQFP) packages

On-chip static RAM 32kB

On- chip Flash Program memory 512kB

Two 10-bit ADCs provide a total of 14 analog inputs, with conversion times as low as

2.44 μs per channel.

Two 32-bit timers/external event counters (with four capture and four compare

channels each)

USB 2.0 Full-speed compliant device

Features





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Interrupt controller

10-bit DAC

Two UART’S

I2C –bus I/O Controller SPI controller

SSP Serial I/O controller

Watch Dog timer

Real Time Clock PWM

Crystal Oscillator 1-25 MHz





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RM7 is a 32 bit architecture‐

a Paths and Instructions (ARM) are 32 bits wid

Von Neumann Architecture‐

– Instructions and Data usesame bus

• Thumb Mode

– Subset of 16 bit instructions‐





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Processor Modes• Unprivileged Mode

• Most tasks run on this mode

•

Entered when a high priority Interrupt is occurred

•

Entered when a low priority interrupt (normal) is

occurred

• Entered on Reset





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• ARM has 37 registers all of which are 32 bits long1 dedicated Program Counter

1 dedicated Current Program Status Register (CPSR)

5 dedicated Saved Program Status Register (SPSR)

30 General Purpose Register

Registers





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Status Register





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ADC





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Implements Binary search algorithm

Initially, DAC input set to midscale (MSB =1)

VIN < VDAC , MSB remains 1

VIN > VDAC , MSB set to 0

Algorithm is repeated until LSB

End of algorithm, DAC [input] = ADC [output]

N cycles required for N-bit conversion

ADC





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FLOW CHART





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TEMPERATURE SENSOR

LM35

Features

Calibrated directly in ° Celsius (Centigrade)

Linear +10.0 mV/°C

Scale factor is 0.01V/ oC

Rated for full -55° to +150°C range

Less than 60 µA current drainLow self-heating, 0.08°C in still air

Nonlinearity only ±¼°C typical

DRK





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BLOCK DIAGRAM OF TEMPERATURE SENSOR

DRK





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DRK ll f i i





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HUMIDITY SENSOR

Capacitive type Humidity Sensor

SY-HC-01

DRK C ll f E i i &





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SPECIFICATION VALUE

Rated Voltage AC 1V max (at 1 KHz)Rated Power AC 0.26 mW

Operating Temperature 0-60ºC

Operating Humidity 20-95%RH

Storage Temperature -35 ~ 80 ºC

Humidity Accuracy ±5%RH(at 25ºC, 60%RH)

SY-HC-01

DRK C ll f E i i &





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OPERATING RANGE OF SENSOR

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UART

RDR TDR

RSR TSR 0

BAUD Rate

Generator

Receiver

Control

Transmitter

Control

SCCR

SCSR

RxD

TD

RE

RD

RF PE FE

BClk

Ld

1

SEL

2

SEL

1

SEL

0TIE RIE

3

8Data Bus

8

Receiver

Transmitter

TxD

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UART Frame

Start Bit Always 0

Parity bit As per parity selected / None

Stop Bit Always 1

Data Bits 7 bits(with parity) / 8 bits (with no parity)

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Create in 1960 and up19-4-2012d in 1969

Logic 1 : -3 to -25 volt

Logic 0 : 3 to 25 volt

The baud rate of the must match with the baud

rate of the pc

PC standard baud rate (hyper terminal

configuration)

2400-4800-9600-14400-19200…….

1 DCD

2 RD

3 TD

4 DTR

5 GND

6 DSR

7 RTS

8 CTS

9 RI

RS232 Standard

RS-232 TTL Logic

-25V … -3V +2V … +5V High

+3V … +25V 0V … +0.8V Low

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MAX-232

RS-232 TTL Logic

-25V … -3V +2V … +5V High

+3V … +25V 0V … +0.8V Low

DRK C ll f E i i &





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LCD

DRK College of Engineering &





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LCD Pin No Function Name

1 Ground (0V) Ground

2 Supply voltage; 5V (4.7V – 5.3V) Vcc

3 Contrast adjustment; through a variable resistor VEE

4 Selects command register when low; and data register when high Register Select

5 Low to write to the register; High to read from theregister

Read/write

6 Sends data to data pins when a high to low pulse isgiven

Enable

7 8-bit data pins DB0

8 DB1

9 DB210 DB3

11 DB4

12 DB5

13 DB6

14 DB7

15 Backlight VCC (5V) Led+

16 Backlight Ground (0V) Led-

Schematic



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Schematic

Sta t

Flow chart



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Convert the data in to ASCIIDisplay the values of temperature in LCD

unit

Start

Initialize LCD and

UART

Acquire analog valuesfrom sensors and

convert them to digitalvalues

Transmit the data(ASCII) through UART1 to Serial Port of PC

Transmit the data(ASCII) through UART1 to Serial Port of PC

Flow chart






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Software tools used

KEIL µ-VISION

FLASH MAGIC

HYPER TERMINAL






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HYPERTERMINAL






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APPLICATIONS

General Research

Manufacturing Industries

Food Processing

Monitoring in Buildings

Automotive

Civil Engineering

Environmental Monitoring

Real Time observation






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FUTURE SCOPE

This project can be further implemented through wireless technology.

Wireless is one of the most promising technologies for data acquisition.

Monitoring and control can also be done by including buzzer alarm.

Remote Data acquisition and monitoring is possible.






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CONCLUSION

This project is used for industrial applications for data acquisition and monitoring

of various parameters. By using this ARMLPC2148 microcontroller, this project is

successfully implemented.

It can be used in various industries for constant monitoring over a wide

range of temperature and humidity’s for various purposes. Data logging of

values acquired from serial port to text file can also be done from Hyperterminal

where off-line analysis can be done further using the data acquired.






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Data Acquisition Using ARM7

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