Data Acquisition Using ARM
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DATA ACQUISITON USING ARM Project- Seminar DATA ACQUISITON USING ARM
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Transcript of Data Acquisition Using ARM
DATA ACQUISITON USING ARM
Project- Seminar
DATA ACQUISITON USING ARM
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
Data acquisition is the process of sampling signals that measure real world physical conditions and converting the resulting samples into digital numeric values that can be manipulated. Data acquisition systems abbreviated with the acronym DAS or DAQ
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
The components of data acquisition systems include:•Sensors
•Signal conditioning
•Analog-to-digital converters
•Display unit
Components of Data Acquisition System
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
SIMPLE DAS
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
ARM7
TDMI
LPC2148
ARM7
TDMI
LPC2148
Temperature Sensor
Temperature Sensor
Humidity Sensor
Humidity Sensor
Power SupplyPower Supply
16 X 2
LCD unit
16 X 2
LCD unit
MAX-232
IC
MAX-232
IC
ComputerComputer
Block Diagram
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
230v AC
mains supply
12v DC Regulated
power supply
Power Supply
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
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
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
Why ARM??
Core Performance-ARM 7 and ARM 9 support 300
MIPS (Million Instructions per Second)
Wide Support
Low Power Consumption
Various special features
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
ARM7 TDMI
• The ARM7 TDMI is based on ARM7 Core– 3 Stage Pipeline– Von Neumann Architecture‐T – Thumb instruction SetsD – Includes debug extensionsM – Enhanced Multiplier, yield a full 64-bit resultI – Core has Embedded ICE logic extensions
DATA ACQUISITION USING ARM7
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19-4-2012
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 comparechannels each)
USB 2.0 Full-speed compliant device
Features
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
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
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
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• Entered on Software Interrupt
• To handle memory access violations
• To handle un defined instructions‐
• Privileged mode using the same registers as user mode
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
• ARM has 37 registers all of which are 32 bits long
1 dedicated Program Counter
1 dedicated Current Program Status Register (CPSR)
5 dedicated Saved Program Status Register (SPSR)
30 General Purpose Register
Registers
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
ADC
DATA ACQUISITION USING ARM7
Project- Seminar
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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
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
FLOW CHART
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
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 drain
Low self-heating, 0.08°C in still air
Nonlinearity only ±¼°C typical
DATA ACQUISITION USING ARM7
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19-4-2012
BLOCK DIAGRAM OF TEMPERATURE SENSOR
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
HUMIDITY SENSOR
Capacitive type Humidity Sensor
SY-HC-01
DATA ACQUISITION USING ARM7
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19-4-2012
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
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
OPERATING RANGE OF SENSOR
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
Pin No
Function Name
1 Ground (0V) Ground2 Supply voltage; 5V (4.7V – 5.3V) Vcc3 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 the register
Read/write
6 Sends data to data pins when a high to low pulse is given
Enable
7
8-bit data pins
DB08 DB19 DB2
10 DB311 DB412 DB513 DB614 DB715 Backlight VCC (5V) Led+16 Backlight Ground (0V) Led-
Project- Seminar
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Schematic
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Convert the data in to ASCIIConvert the data in to ASCIIDisplay the values of temperature in LCD
unit
Display the values of temperature in LCD
unit
StartStart
Initialize LCD and UART
Initialize LCD and UART
Acquire analog values from sensors and
convert them to digital values
Acquire analog values from sensors and
convert them to digital values
Transmit the data (ASCII) through UART 1 to Serial Port of PC
Transmit the data (ASCII) through UART 1 to Serial Port of PC
Flow chart
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
Software tools usedKEIL µ-VISION
FLASH MAGIC
HYPER TERMINAL
DATA ACQUISITION USING ARM7
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19-4-2012
APPLICATIONS
General Research
Manufacturing Industries
Food Processing
Monitoring in Buildings
Automotive
Civil Engineering
Environmental Monitoring
Real Time observation
DATA ACQUISITION USING ARM7
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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.
DATA ACQUISITION USING ARM7
Project- Seminar
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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.
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
?? QUERIES ??
DATA ACQUISITION USING ARM7
Project- Seminar
19-4-2012
THANK YOU THANK YOU
