Do It Yourself a Heart Beat Monitor With AVR

Guys,

I want to share my weekend project on creating a heartbeat monitor with AVR.
In this experiment I'm using ATMEGA128 and LM358 as the sensor amplifier,

Let's get started

Step 1: Some Components for This Project

1. ATMEGA128
2. LM358
3. Infrared photo transistor
4. LCD 16x2
5. USBASP debugger

Step 2: A Software Developed on Atmel Studio

Then continue on developing the software for it,
Here's the main code...
cli();
   current_rps = rps;
   sei();
   if (minute==1)
    {
      lcd_cmd(0x01);
    sprintf(rps_lcd,"%.3f",current_rps);
    sprintf(rpm_lcd,"%.3f", current_rps * 60.0);

    lcd_xy(0,0);
    lcd_string("BPS = ");
    lcd_string(rps_lcd);

    lcd_xy(1,0);
    lcd_string("BPM = ");
    lcd_string(rpm_lcd);
}