Make Yourself a Speaking ATMEGA128

Guys,

In previous weekend, I made myself a speaking ATMEGA128.
I used ATMEGA128 and LM386 as an amplifier,

Let's get started

These parts are needed for this project :

1. LM386
2.ATMEGA128
3.USBISP
4.AVRStudio
5. Small speaker
6. LCD 16x2

Here's the connection I used for this project :

I connected PB5 as an input for LM386
and for LCD :
#define lcd_data_pin PORTA

#define en PORT_D.b2
#define rs PORT_D.b3
#define rw PORT_D.b4

I used PWM and timer for this project
void pwm_init(void)
{
    /* use OC1A pin as output */
    DDRB = _BV(PB5);

    /*
    * clear OC1A on compare match
    * set OC1A at BOTTOM, non-inverting mode
    * Fast PWM, 8bit
    */
    TCCR1A = _BV(COM1A1) | _BV(WGM10);
  
    /*
    * Fast PWM, 8bit
    * Prescaler: clk/1 = 8MHz
    * PWM frequency = 8MHz / (255 + 1) = 31.25kHz
    */
    TCCR1B = _BV(WGM12) | _BV(CS10);
  
    /* set initial duty cycle to zero */
    OCR1A = 0;
  
    /* Setup Timer0 */

    TCCR0|=(1<<CS00);
    TCNT0=0;
    TIMSK|=(1<<TOIE0);
    sample_count = 4;
    sei(); //Enable interrupts
}

Test and enjoy yourself a speaking ATMEGA128
See and hear the video :