Temperature and Pressure Sensor part 2 (C++ code)

05:59:00 Unknown 0 Comments

Voltage regulator:

            It is used to regulate the voltage. We are using 7805which gives us 5 voltage at output that is supply to microcontroller. These ripples can be removed by using voltage regulator it provides us regulated constant voltages. The purpose of a voltage regulator is to keep the voltage in a circuit relatively close to a desired value. Voltage regulators are one of the most common electronic components, since a power supply frequently produces raw current that would otherwise damage one of the components in the circuit. Voltage regulators have a variety of specific functions, depending on their particular application
Buzzer, Oscillor and capacitors:
          We are using buzzer if the input value in greater than the room temperature. We are using 8MHz oscillator and 2 capacitors of 30 microf.
Keypad:
            We are using 3x4 keypad in this project to enter digits.
Potentiometer:
This is used for variable resistance.

C code:
#include
#pragma config OSC = HS, OSCS = OFF
#pragma config PWRT =OFF,LVP =OFF
#pragma config DEBUG = OFF, STVR = OFF
#pragma config WDT=OFF
#define ldata PORTD
#define rs PORTCbits.RC5
#define rw PORTCbits.RC6
#define en PORTCbits.RC7
far rom const char mycom[] = {0x01,0x06,0x0C,0x80,'\0'};
far rom const char mydata13[]="Temperature and\0";
far rom const char mydata14[]="Pressure Sensor\0";
far rom const char mydata15[]="PreSet Temp: \0";
far rom const char mydata10[]="Temperature: \0";   //0=end of stirng
far rom const char mydata2[]="Pressure: \0";
far rom const char Unit[]="kPa \0";
void LCDMSDelay(unsigned int);
void lcddata(unsigned char);
void lcdcmd(unsigned char);
void MSDelay(unsigned char);
unsigned char RBIF_ISR();
void code_enter();
void chk_isr ();
unsigned char z ,cod, code[4] , temp[4], x , i , m ,l, a , b,j ,g, o,cnt=0;
unsigned int nol ,noh , nom , nohh ,c, d, e, h, f, L, p;
unsigned char keypad [4][3]={0x31,0x32,0x33,
0x34,0x35,0x36,
0x37,0x38,0x39,
'*',0x30,'#'};
void chk_isr ();
#pragma code my_hiprio_int =0x0008
void my_hiprio_int(void)
{
_asm
GOTO chk_isr
_endasm
}
#pragma code
#pragma interrupt chk_isr
void chk_isr ()
{
if (INTCONbits.RBIF==1)
RBIF_ISR ();
}
#pragma code
    unsigned char L_Byte,H_Byte;
    unsigned char Bin_Temp,Bin_Pres,m;
    unsigned char z,y = 'l';
void main (void)
{
    i=1;
    TRISAbits.TRISA0=1;
    TRISD=0;
    TRISC=0;
    TRISB=0xF0;
    PORTB=0xF0;
    PORTCbits.RC2 = 0;
    TRISAbits.TRISA0=1;
    TRISAbits.TRISA1=1;
    TRISAbits.TRISA3=1;
    en=0;
    LCDMSDelay(150);
    lcdcmd(0x38);
    LCDMSDelay(150);
 for(z=0;mycom[z]!='\0';z++)
    {
        lcdcmd(mycom[z]);
        LCDMSDelay(10);
    }
 lcdcmd(0x8F);
    for(z=0;mydata13[z]!='\0';z++)
    {
         lcdcmd(0x07);
         lcddata(mydata13[z]);
         MSDelay(60);
    }
   lcdcmd(0x01);
   lcdcmd(0x8F);
    for(z=0;mydata14[z]!='\0';z++)
    {
        lcdcmd(0x07);
        lcddata(mydata14[z]);
        MSDelay(60);
    }
   lcdcmd(0x01);
    for(z=0;mycom[z]!='\0';z++)
    {
        lcdcmd(mycom[z]);
        LCDMSDelay(50);
    }
 lcdcmd(0x01);
 for(z=0;mydata15[z]!='\0';z++)
    {
        lcddata(mydata15[z]);
        MSDelay(6);
    }
    MSDelay(700);
for(j=0;j<2 j="" o:p="">
{
    code_enter();
}
    for(z=0;mycom[z]!='\0';z++)
    {
        lcdcmd(mycom[z]);
        LCDMSDelay(10);
    }
MSDelay(250);
    for(z=0;mydata10[z]!='\0';z++)
    {
        lcddata(mydata10[z]);
        MSDelay(6);
    }
    lcdcmd(0xC0);
    LCDMSDelay(10);
   for(z=0; mydata2[z]!= '\0';z++)
    {
        lcddata(mydata2[z]);
        MSDelay(3);
    }
    while(1)
    {
        lcdcmd(0x8C);
        LCDMSDelay(3);
        ADCON0=0x81;
        ADCON1=0x85;
        MSDelay(10);
        ADCON0bits.GO=1;
        while(ADCON0bits.DONE==1);
        L_Byte=ADRESL;
        H_Byte=ADRESH;
        L_Byte>>=2;
        L_Byte&=0x3F;
        H_Byte<<=6;
        H_Byte&=0xC0;
        Bin_Temp= L_Byte|H_Byte;
        z=Bin_Temp;
        l=Bin_Temp;
        l=Bin_Temp/10;
        l=l+48;
        lcddata(l);
        Bin_Temp=Bin_Temp%10;
        l=Bin_Temp+48;
        MSDelay(1);
        lcddata(l);
        lcdcmd(0x8F);
        MSDelay(1);
        lcddata('C');

        ADCON0bits.GO=0;
        if(code[1] > z/10)
           PORTCbits.RC2=1;
        else
        {
            if(code[1] == z/10)
                if(code[2] > (z % 10))
                    PORTCbits.RC2 = 1;
                else;
        }
        MSDelay(9);
        lcddata(l);
        MSDelay(9);
        lcdcmd(0xCA);
        LCDMSDelay(3);
        ADCON0=0x89;
        ADCON1=0x80;
        MSDelay(1);
        ADCON0bits.GO=1;
        while(ADCON0bits.GO==1);
        L_Byte=ADRESL;
        H_Byte=ADRESH;
        L_Byte>>=2;
        L_Byte&=0x3F;
        H_Byte<<=6;
        H_Byte&=0xC0;
        Bin_Pres= L_Byte|H_Byte;
        m=Bin_Pres;
        m=Bin_Pres/100;
        m=m+48;
        lcddata(m);
        Bin_Pres=Bin_Pres%100;
        m=Bin_Pres/10;
        m=m+48;
        MSDelay(1);
        lcddata(m);
        m=Bin_Pres%10;
        m=m+48;
        lcddata(m);
        MSDelay(1);
for (z=0;Unit[z]!='\0';z++)
{
        lcddata(Unit[z]);
        MSDelay(1);
}

        ADCON0bits.GO=0;
    }}

void lcdcmd(unsigned char value)
{
    ldata= value;
    rs=0;
    rw=0;
    en=1;
    MSDelay(10);
    en=0;
}
void lcddata(unsigned char k)
{
    ldata= k;
    rs=1;
    rw=0;
    en=1;
    MSDelay(10);
    en=0;
}
 void MSDelay(unsigned char itime)
    {
        unsigned char i;
        unsigned char j;
    for(i=0;i
        for(j=0;j<165 j="" o:p="">
    }
 void LCDMSDelay(unsigned int itime)
 {
     unsigned int i,j;
     for(i=0;i
         for(j=0;j<135 j="" o:p="">
 }
 void code_enter()
{
    INTCON2bits.RBPU=0;
    while (PORTB !=0xF0)
{};
INTCONbits.RBIE=1;
INTCONbits.GIE=1;
while(!x)
{};
code[i]=x;
lcddata(code[i]);
code[i] = code[i] - 48;
x=0;
i++;
MSDelay(15);
}
unsigned char RBIF_ISR()
{
unsigned char temp , COL=0, ROW=4 ;
temp=PORTB;
temp ^=0xF0;
if (!temp) return;
while (temp<<=1) COL++;
PORTB = 0xFE;
if(PORTB !=0xFE)
ROW=0;
else
{
PORTB = 0xFD;
if(PORTB !=0xFD)
ROW=1;
else
{
PORTB = 0xFB;
if(PORTB !=0xFB)
ROW=2;
else
{
PORTB = 0xF7;
if(PORTB !=0xF7)
ROW=3;
}
}
}
if(ROW<4 o:p="">
x=keypad [ROW][COL];
MSDelay(250);
while(PORTB !=0xF0) PORTB=0xF0;
INTCONbits.RBIF=0;
} 
Applications of Sensors:
Sensors are used in everyday objects such as touch-sensitive elevator buttons and lamps which dim or brighten by touching the base. There are also innumerable applications for sensors of which most people are never aware. Applications include cars, machines, aerospace, medicine, manufacturing and robotics. Some more applications are in
ü  Pump/motor controller
ü  Level indicator
ü  Medical diagnostics
ü  Pressure switching
ü  Barometers
ü  Altimeters


Project Cost:

Sr. No.
Componets
Rs/-
1
Pic18F452
360/-
2
LM35
65/-
3
3-Potentio Meter
15/-
4
Base for Pic18F452
50/-
5
16x2 LCD
450/-
6
3x4 Keypad
150/-
7
Buzzer
10/-
8
Voltage Regulator 7805
10/-
9
MPx2100
350/-
10
Battery
90/-
11
PCB
60/-
12
FeCl3
200/-
13
Slodering wire, paste
100/-
14
Oscillator,Capacitors
30/-
15
Total Cost
1940/-

I am Mechatronics and Control Engineer from UET, Lahore. Helping Engineering students gives me pleasure.

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