4- channel data acquition system

PROJECT ASSOCIATES

D.VINEESH KUMAR REDDY(08911A04C0)

CH.RAVI(08911A0474)SYED P MINELLA(08911A04A2)

PROJECT GUIDE: K.PAVANI

AIM

The main aim of this project is to acquire data from four different sensors and display those values on the LCD

• The purpose of data acquisition is to measure an electrical or physical phenomenon such as voltage, current, temperature, pressure, or sound.

• Many times it is required to monitor physical phenomena such as temperature, pressure, humidity, light intensity, sound intensity, force, etc. Such physical phenomena can be monitored by digital systems employing sensors.

In this project we are interfacing four different sensors to the microcontroller with the help of ADC. To implement this over all project components required are:MicrocontrollerMCP3204Temperature sensorSmoke sensorVariable resistorLCDLDRLEDs

BLOCK DIAGRAM

AT89S52

LCD

MCP 3204

SENSOR1

LED2

SENSOR2

SENSOR3

SENSOR4

LED1

LED3

LED4

LCD Pin description

at89s52Compatible with MCS ®51 products8Kb of ISP flash memory256x8 bit internal RAM32 Programmable I/O linesThree 16 bit timer/countersFull duplex UART serial channel

Pin diagram of at89s52

LM35The LM35 series are precision integrated-circuit temperature sensors, whose output voltage is proportional to the Celsius temperature

•LM35 operates from 4 to 30 volts•It has low self heating

Ldr(Light dependent resistor)•The resistance of LDR is normally high and when they are illuminated by light the resistance falls dramatically.

Mq-2 Gas sensor•Sensitive material of MQ-2 gas sensor is SnO2

which has lower conductivity in clean air•When target combustible gas exist, the sensor’s conductivity is higher with the gas concentration raising.

•MQ-2 gas sensor has high sensitivity to Propane, LPG and Hydrogen.

mcp3204•MCP3204/3208 devices are successive approximation 12-bit A/D converters with on board sample and hold circuit.

•The MCP3204 is programmable to provide 4 single ended inputs.

Isp programmer•In-System Programming (abbreviated ISP) is the ability of some programmable logic devices, microcontrollers, and other programmable electronic chips to be programmed while installed in a complete system, rather than requiring the chip to be programmed prior to installing it into the system.

Advantages & applications

• Low cost• Flexible• Low power consumption

APPLICATIONS:• Can be used in industries • Can be used in Nuclear plants• Can be used in mines

reference

• “The 8051 Microcontroller and Embedded Systems” by Muhammad Ali Mazidi and Janice Gillispie Mazidi, Pearson Education.

• ATMEL 89S52 Data sheets

THANK YOU