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

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

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);
}

Enjoy it on video...