DIGITAL THERMOMETER WITH 8051

This is the project about sensing the temperature from environment and display it in LCD. We use 16x2 LCD for display.


LM35 :-
                We use LM35 temperature sensor for sensing the temperature from environment. It gives 10 milivolt on 1°C temperature when operating on 5 volts.






ADC0804 :- 
                    LM35 gives the analog signal for converting this into digital signal we use a 8 bit ADC IC ADC0804.










16x2 LCD :-
                       16x2 LCD is used to display the Temperature.   see more here......                                                                    
   LCD INTERFACING WITH 8051


8051 :-

           
Circuit Digram :-
       

pink lines - 12v
red lines - 5v
black lines - ground
blue lines - data

download this image and zoom in then you can see clearly all the connections.

Components Required :-

1N4007 diode - 1
330 0HM RESISTANCE - 2
10K OHM RESISTANCE - 2
10K OHM VARIABLE RESISTANCE - 2
150PF CAPACITOR - 1
33PF CAPACITOR - 2
10UF CAPACITOR - 1
1000UF CAPACITOR - 1
11.0592 MHZ CRYSTAL OSCILLATOR - 1
GREEN LED - 1

RED LED - 116X2 LCD - 1
12 volt battery upto 1.5 amp. -1
P89V51RD2 MICROCONTROLLER - 1
PUSH BUTTON - 1
ADC0804 IC - 1

LM35 - 1
7805 IC - 1
16x2 LCD - 1
MALE AND FEMALE CONNECTORS LINES
CONNECTING WIRES.

Code :-

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//Program to display temperature in Celsius and Farenheit scale.

#include<reg51.h>
#define sec 100
sbit rs = P3^0;
sbit rw = P3^1;
sbit e = P3^2;

sbit wr= P3^3;
sbit rd= P3^4;
sbit intr= P3^5;

int x=0, y=0,z[10],a[3]={0,0,0};

void delay(unsigned int msec )
{
    int i ,j ;
    for(i=0;i<msec;i++)
        for(j=0; j<1275; j++);
}

void lcd_cmd(unsigned char item)    // Function to send commands to LCD
{
    P2 = item;
    rs= 0;
    rw=0;
    e=1;
    delay(1);
    e=0;
    return;
}

void lcd_data(unsigned char item)    // Function to send data to LCD
{
    P2 = item;
    rs= 1;
    rw=0;
    e=1;
    delay(1);
    e=0;
    return;
}

void lcd_data_string(unsigned char *str)  // Function to string to LCD
{
    int i=0;
    while(str[i]!='\0')
    {
        lcd_data(str[i]);
        i++;
        delay(10);
    }
    return;
}

void shape()        // Function to make the shape of degree symbol
{
    lcd_cmd(64);
    lcd_data(2);
    lcd_data(5);
    lcd_data(2);
    lcd_data(0);
    lcd_data(0);
    lcd_data(0);
    lcd_data(0);
    lcd_data(0);
}
       
void convert()     // Function to convert the values of ADC into numeric value to be sent to LCD
{
    int    s;
    lcd_cmd(0x81);      
    delay(2);
    lcd_data_string("TEMP:");
    y=(((9*x)/5)+32);
    s=y/100;
    y=y%100;
    lcd_cmd(0x88);
    if(s!=0)
    lcd_data(s+48);
    else
    lcd_cmd(0x06);
    s=y/10;
    y=y%10;
    lcd_data(s+48);
    lcd_data(y+48);
    lcd_data(0);
    lcd_data('F');
    lcd_data(' ');

    y=x;
    lcd_cmd(0xc1);        //Setting  cursor to first position of first line
    delay(2);
    lcd_data_string("TEMP:");
    s=y/100;
    y=y%100;
    lcd_cmd(0xc8);
    if(s!=0)
    lcd_data(s+48);
    else
    lcd_cmd(0x06);
    s=y/10;
    y=y%10;
    lcd_data(s+48);
    lcd_data(y+48);
    lcd_data(0);
    lcd_data('c');
    lcd_data(' ');
    delay(2);
}

void main()
{
    int i,j;
    P1=0xff;
    lcd_cmd(0x38);        //2 Line, 5X7 Matrix display
    lcd_cmd(0x0c);        //Display On, Cursor blinking
    delay(2);
    lcd_cmd(0x01);        // clear screen
    delay(2);

    while(1)
    {
        for(j=0;j<3;j++)
        {
            for(i=0;i<10;i++)
            {
                delay(1);
                rd=1;
                wr=0;
                delay(1);
                wr=1;
                while(intr==1);
                rd=0;
                lcd_cmd(0x88);
                z[i]=P1/10;
                delay(1);
                intr=1;
            }
            for(i=0;i<10;i++)
            a[j]=z[i]+a[j];
        }

        a[0]=a[0]/3;
        a[1]=a[1]/3;
        a[2]=a[2]/3;
        x=a[0]+a[1]+a[2];
        shape();
        convert();
    }
}

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Calculations in above program are standard.

Pictures :-

Videos :-

 

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CELLPHONE OPERATED ROBOT

Description :-
                            Our mobile keypad generate a DTMF (dual tone multi frequency) signal. These dual tone multi frequencies can be transferred via headphone to the microcontroller with the help of DTMF decoder IC(HT9170). This IC decode the DTMF signal into 4-bit binary data which can be further processed by microcontroller.
                              This project can be made wireless using two mobiles. Just connect the a mobile on robot using headphone and make a call on the mobile on the robot, receive the call once and operate the robot wirelessly with infinite range.

DTMF Decoder(HT9170) :-

     

This DTMF decoder IC decodes the DTMF signal into 4-bit binary data which can be further processed by                             microcontroller for making decisions for motors and LCD.

1. Pin 15(DV data valid): The data valid pin is become high when the dtmf decoder receive a valid data or this pin hold's the 5v when the key is pressed.

2. Pin 10(OE output enable): This pin is use to enable the output when this pin is high the data pin are active and the decoded output is sent to the decoded pin.

3. Pin 11-14(D0-D3 data pins): These are the data pins which makes the 4 bit data after pressing a key on the mobile such as 0001 for pressing the key 1 and other are shown into the picture shown.

4. Pin X1 or X2: These pin's are use for providing the oscillation to the ic basically a xtal of 3.579 MHz is used here. for more details download the HT9170 datasheet.

.
 Motor driver circuit :-  The IC-l293d  is well known as motor driver this is 12v motor driver we use the motor driver IC because our micro-controller is work on 5v and the motor have different operating voltage. So to meet with these parameter we use these driver IC there are so many other IC available for different configuration. 

LCD Interfacing :- 

                               We interface the The lcd here for showing that what operation is performed on actuators. Know about lcd interfacing click here

 LCD INTERFACING WITH 8051 IN 8-BIT MODE

8051 :-

Horn :-

               We also connect a horn(speaker) here for make the feeling like a car.

Headphone :- 

                         Buy a headphone/earphone of 3.5 mm jack. Now cut the speaker(only one ) of earphone. Now burn the small length of wire head at the speaker end you found 2 wires at inner side of headphone wire. Scrub the wires for remove the coating. Now connect that  wires as shown in circuit diagram :-

cut only one speaker

use only one wire or ground another

Circuit Diagram :-

                          

open or download this image, zoom in the circuit then you can see clearly

blue lines - data lines

red lines - +5v line

black lines - ground line

pink line - +12 v line

CODE IS GIVEN BELOW

Components Required :-

1N4007 diode - 1
330 0HM RESISTANCE - 3
10K OHM RESISTANCE - 1
10K OHM VARIABLE RESISTANCE - 1
300K OHM RESISTANCE - 1
100k OHM RESISTANCE - 2
0.1UF CAPACITOR - 2
33PF CAPACITOR - 4
10UF CAPACITOR - 1
100UF CAPACITOR - 2 (ON MOTORS FOR CONTINUITY)
1000UF CAPACITOR - 1
3.579 MHZ CRYSTAL OSCILLATOR - 1
11.0592 MHZ CRYSTAL OSCILLATOR - 1
RED LED - 2
GREEN LED - 1
SPEAKER(SMALL) - 1
16X2 LCD - 1
12 volt battery upto 1.5 amp. -1
P89V51RD2 MICROCONTROLLER - 1
PUSH BUTTON - 1
HT9170 IC - 1
L293D IC - 1
100 RPM 12V DC MOTORS - 2
7805 IC - 1
HEADPHONE WITH 3.5MM JACK - 1
MOBILES (atleast one support 3.5mm jack) - 1
MALE AND FEMALE CONNECTORS LINES
CONNECTING WIRES.



CODE :-

----------------------------------------------------------------------------------------------------------------------------------


#include<reg51.h>
int i,j,k,l,m,n,o; //declaration of variables
sbit RS=P1^4;   //port 1 pins as indvidual switches
sbit RW=P1^5;
sbit EN=P1^6;
sbit i1=P1^0;
sbit i2=P1^1;
sbit i3=P1^2;
sbit i4=P1^3;
void lcd_cmd(unsigned char value); //declation of command function of lcd
void lcd_data(unsigned char value); //declation of data function of lcd
void delay();
char a[7]="forward";
char b[8]="backward";
char c[5]="right"; //declaring string arrays for lcd 
char d[4]="left";
char e[4]="horn";
char f[9]="headlight";
void main()
{
 P1=P2=P3=0x00;   //initialisation of ports
while(1)
{
lcd_cmd(0x38);   //
delay();
lcd_cmd(0x0e);   //
delay(); //intializing lcd
lcd_cmd(0x06);
delay(); //
  lcd_cmd(0x01);
delay();
  if(i2==1&&i1==0&&i3==0&&i4==0) //conditions for motors
{
P2=0x0a;

}
else if(i3==1&&i1==0&&i2==0&&i4==0)
{
P2=0x08;

}
else if(i2==1&&i3==1&&i1==0&&i4==0)
{
P2=0x02;

}
else if(i4==1&&i1==0&&i2==0&&i3==0)
{
P2=0X25;

}
else if(i1==1&&i3==1&&i2==0&&i4==0)
{
P2=0X40;

}
else if(i1==1&&i2==0&&i3==0&&i4==0)
{
P2=0x10;
}



else
{
P2=0x00;
}
if(i2==1&&i1==0&&i3==0&&i4==0)  //condition for lcd
{
for(i=0;i<7;i++)
  {
    lcd_data(a[i]);
}
}
if(i3==1&&i1==0&&i2==0&&i4==0)
{
for(j=0;j<4;j++)
  {
    lcd_data(d[j]);
}
}
if(i2==1&&i3==1&&i1==0&&i4==0)
{
for(k=0;k<5;k++)
  {
    lcd_data(c[k]);
}
}
if(i4==1&&i1==0&&i2==0&&i3==0)
{
for(l=0;l<8;l++)
  {
    lcd_data(b[l]);
}
}
if(i1==1&&i3==1&&i2==0&&i4==0)
{
for(m=0;m<4;m++)
  {
    lcd_data(e[m]);
}
}
if(i1==1&&i2==0&&i3==0&&i4==0)
{
for(o=0;o<9;o++)
  {
    lcd_data(f[o]);
}
}
}
}
void lcd_cmd(unsigned char value) //definition of command function
   {
     RS=0;
RW=0;
P3=value;
EN=1;
delay();
EN=0;
   }
void lcd_data(unsigned char value) //definition of data function
   {
     RS=1;
RW=0;
P3=value;
EN=1;
delay();
EN=0;
   }
void delay()
   { //definition of delay function
    for(n=0;n<2;n++)
    {
      TMOD=0X01;
      TH0=0X4B;
      TL0=0XFD;
      TR0=1;
      while(TF0==0);
      TF0=0;
      TR0=0;
    }
  }    

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Pictures :-
                     

Videos :-

                   

IF YOU HAVE ANY QUERY THAN CONTACT US OR GIVE YOUR QUERY IN THE QUERY OPTION.      

                                                            GOOD LUCK

More embedded projects >>....                                                More MAT LAB projects>>...

 c, c++, java programs>>...