Heart-rate-monitoring-system-using-pic-controller-

pic 16F877A

#include <xc.h> #define _XTAL_FREQ 4000000

// LCD Connections #define RS RB4 #define EN RB5 #define D4 RB0 #define D5 RB1 #define D6 RB2 #define D7 RB3

// Function Prototypes void Lcd_Init(); void Lcd_Command(unsigned char); void Lcd_Char(unsigned char); void Lcd_String(const char *); void Lcd_Set_Cursor(unsigned char, unsigned char); void Lcd_Clear(); void delay();

unsigned int pulse_count = 0;

void main(void) { TRISB = 0x00; // LCD PORT TRISC = 0xFF; // Input for IR receiver TRISA = 0xFF; // Sensor input PORTB = 0x00;

Lcd_Init();
Lcd_Set_Cursor(1, 1);
Lcd_String("Heart Rate:");

while (1) {
    pulse_count = 0;
    // Count pulses for 15 seconds (simulate)
    for (int i = 0; i < 15000; i++) {
        if (RC0 == 1) { // IR Pulse Detected
            pulse_count++;
            __delay_ms(20); // Debounce
        }
    }

    unsigned int heart_rate = pulse_count * 4;
    
    Lcd_Set_Cursor(2, 1);
    Lcd_String("BPM: ");
    if (heart_rate < 100)
        Lcd_Char(' ');
    if (heart_rate < 10)
        Lcd_Char(' ');
    Lcd_Char((heart_rate / 100) + 48);
    Lcd_Char(((heart_rate / 10) % 10) + 48);
    Lcd_Char((heart_rate % 10) + 48);

    __delay_ms(1000);
    Lcd_Clear();
    Lcd_Set_Cursor(1, 1);
    Lcd_String("Heart Rate:");
}

}

// LCD Functions void Lcd_Init() { Lcd_Command(0x02); Lcd_Command(0x28); Lcd_Command(0x0C); Lcd_Command(0x06); Lcd_Command(0x01); }

void Lcd_Command(unsigned char cmd) { RS = 0; D4 = (cmd >> 4) & 0x01; D5 = (cmd >> 5) & 0x01; D6 = (cmd >> 6) & 0x01; D7 = (cmd >> 7) & 0x01; EN = 1; __delay_ms(2); EN = 0;

D4 = (cmd >> 0) & 0x01;
D5 = (cmd >> 1) & 0x01;
D6 = (cmd >> 2) & 0x01;
D7 = (cmd >> 3) & 0x01;
EN = 1;
__delay_ms(2);
EN = 0;

}

void Lcd_Char(unsigned char data) { RS = 1; D4 = (data >> 4) & 0x01; D5 = (data >> 5) & 0x01; D6 = (data >> 6) & 0x01; D7 = (data >> 7) & 0x01; EN = 1; __delay_ms(2); EN = 0;

D4 = (data >> 0) & 0x01;
D5 = (data >> 1) & 0x01;
D6 = (data >> 2) & 0x01;
D7 = (data >> 3) & 0x01;
EN = 1;
__delay_ms(2);
EN = 0;

}

void Lcd_String(const char *str) { while (*str != '\0') { Lcd_Char(*str); str++; } }

void Lcd_Set_Cursor(unsigned char row, unsigned char column) { if (row == 1) Lcd_Command(0x80 + column - 1); else if (row == 2) Lcd_Command(0xC0 + column - 1); }

void Lcd_Clear() { Lcd_Command(0x01); __delay_ms(2); }