project report on digital tele

8/8/2019 Project Report on Digital Tele

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PROJECT REPORT ON

DIGITAL TELE-

THERMOMETER

Submitted by:Priyanka Nanda

Branch:Biomedical

College:Citm,Faridabad



CONTENTS

Acknowledgement

Introduction

Components Required

Features

Operation

Program

Circuit diagram

Technical Specifications

Bibliography



ACKNOWLEDGEMENT

It is with deep sense of gratitude and

reverence that I express my sincere

thanks to my supervisor Mr. O.P.

Bhatia for their guidance,

encouragement, help and usefulsuggestions throughout. His untiring

and painstaking efforts, methodical

approach and individual help made it

possible for me to complete this workin time. I consider myself very

fortunate for having been associated

with the scholar like her. His affection,

guidance and scientific approachserved a veritable incentive for

completion of this work.



INTRODUCTION

Digital telethermometer is

ideal for continuous

monitoring of temperature in

anaesthesia,cardiac,surgery,hy

perthermia, pyrogen testing

and bioresearch.



COMPONENTS REQUIRED

PCB(printed circuit board) andsoldering

Power supply(+5 volts)

Microcontroller(PIC16F873A)

Potentiometer

Capacitors(22pf)

Resistors(2K,1K,10K)

Sensors(LM 35)

Crystal oscillator)

Buzzer

LCD display

Keys



PCB(PRINTED CIRCUIT BOARD)- A printed circuit

board, or PCB, is used to mechanically support and

electrically connect electronic

components using conductive pathways, tracks,

or traces, etched from copper

sheets laminated onto a non-

conductive substrate. It is also referred to

as printed wiring board (PWB) or etched wiring

board.

Power Supply- This circuit is a small +5V power

supply, which is useful when experimenting with

digital electronics.Small inexpensive wall

transformers with variable output voltage are

available from anyelectronics shopand

supermarket.



Microcontrollers - Microcontrollers are single chip

computers.It was developed by Intel Corporation in

1981.It was called as a system on a chip.

LCD(Liquid Crystal Display)-LCD is a thin ,flat display device

made up of number of colour or monochrome pixels

arrayed in front of a light source or reflector. It is often

utilized in battery powered electronic devices because it

uses very small amounts of electric power.



FEATURES

HIGHLY ACCURATE AND

RELIABLE

SIMPLE TO USE

FAST RESPONSE TIME FOR

QUICKLY INCREASING OR

DECREASING THE

TEMPERATURE

CONTINUOUS DUTY

OPERATION

CHOICE FOR 1 TO 12

CHANNELS



OPERATION

The required number of sensor probes

at different sites are attached to this

instrument .The power switch is put on

.Select the particular sensor probe by

means of keys.On pressing theparticular keys the temperature of dat

room is sensed and displayed on the

lcd.this is done one by one for the

room

after sensing temperature of all the

room the buzzer will beep..again the

room temperature will be displayed on

the lcd.we can continue this as manynumber of times as we want.



PROGRAM#include <pic.h>

#define RS RC7

#define EN RC6

#define LCD PORTB

#define LM351 RA0

#define LM352 RA1

#define LM353 RA2

#define KEY1 RC1

#define KEY2 RC2

#define KEY3 RC3

#define BUZZER RC4

//-----------------------------------------

void delay(unsigned long int);

void lcd_cmd_send(unsigned char);

void lcd_char_send(unsigned char);

void lcd_display(unsigned char *s,unsigned char,unsigned char);

void lcd_num_dis(unsigned int,unsigned char);

unsigned char LM35_Sensor(unsigned char );

//--------------------------------------------

unsigned char temp,dis_status=0;

//---------------------------------------------

void main()

{



ADCON1=0x80;

TRISA=0x0F;

TRISB=0x00;

TRISC=0x0F;

BUZZER=0;

lcd_cmd_send(0x38);

lcd_cmd_send(0x01);

lcd_cmd_send(0x0C);

lcd_display("D.T. THERMOMETER",1,0);

lcd_display("MADE BY:PRIYANKA",2,0);

BUZZER=1;

while(1)

{

while(KEY1==0)

{

if(dis_status!=1)

{ lcd_cmd_send(0x01);

lcd_display("ROOM1 TEMP=__^C",1,0);

}

dis_status=1;

CHS0=0;CHS1=0;CHS2=0; //channe0

temp=LM35_Sensor(0x8B);

delay(30000);

}





}

dis_status=2;



delay(30000);

}

while(KEY3==0)

{

if(dis_status!=3)



}

dis_status=3;



delay(30000);

}

if(dis_status!=4)

{

lcd_cmd_send(0x01);

lcd_display("D.T. THERMOMETER",1,0);

lcd_display("MADE BY:PRIYANKA",2,0);

}

dis_status=4;

}

}



void delay(unsigned long int mdelay)

{

while(mdelay--);

}

void lcd_cmd_send(unsigned char mcmd)

{

LCD=mcmd;

RS=0;

EN=1;

delay(25);

EN=0;

delay(1000);

}

void lcd_char_send(unsigned char mchar)

{

LCD=mchar;

RS=1;

EN=1;

delay(25);

EN=0;

delay(1000);

}

void lcd_display(unsigned char *s,unsigned char lcd_line,unsigned char lcd_posi)

{ unsigned char ilcd=0;

if(lcd_line==1) lcd_cmd_send(0x80+lcd_posi);



if(lcd_line==2) lcd_cmd_send(0xC0+lcd_posi);

while(s[ilcd]!='\0')

{

lcd_char_send(s[ilcd]);

ilcd++;

}

}

void lcd_num_dis(unsigned int lnum, unsigned char lposi)

{ unsigned int lunit,lten,lhun,ltho;

lunit=lnum%10;

lnum/=10;

lten=lnum%10;

lnum/=10;

lhun=lnum%10;

lnum/=10;

// ltho=lnum%10;

lcd_cmd_send(lposi);

// lcd_char_send(ltho+0x30);

// lcd_char_send(lhun+0x30);

lcd_char_send(lten+0x30);

// lcd_char_send('.');

lcd_char_send(lunit+0x30);

}

unsigned char LM35_Sensor(unsigned char tposi)

{

unsigned long int H1,L1,F1;



ADON=1;

delay(10);

ADGO=1;

while(ADGO);

H1=ADRESH;

H1=H1<<8;



CIRCUIT DIAGRAM



TECHNICAL SPECIFICATIONS

Temperature rate : - 50 ° to 150 Celcius.

Accuracy/Resolution : Within + 0.1 °C between 20

°C to 50 °C ; rest of range, within 1°C

Response Time : Initially, one minute for thermal

stabilisation; thereafter within 5 seconds for

subsequent variations

Sensors/Probes : IC probe that is encapsulated in

epoxy; easily sterilisable; available in 2 types:-

(a) Internal type, for Esophageal or rectal use;

(b) Surface type, for skin temperature use.

Each sensor is provided with 15 feet cable

Channel Selection : From 1 to 12 channels, as per

individual customer requirements. Selectable bymeans of Rotary switch.

Power Source : 220 or 110 Volts/50 Hz /1 ampere



BIBLIOGRAPHY

WIKIPEDIA, the free

encyclopedia

INTERNET resources

Advanced Microelectronics

Electronics Manual of EMTECH

Foundation



Thanking you

project report on digital tele

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