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Guys,

I wanna share my experiment on creating a message flasher with
ATMEGA128 and LCD 16x2,
It can be done on your weekend....

Step 1: Prepare the Components

I prepare all the components below,

The most importants are
ATMEGA128 TQFP 64 and LCD 16x2

Another one,
1  trimpot 1K or a 1K resistor connected to VEE on LCD 16x2 and into GND.


And this is the rest ,please have a look on the screenshot.:

Step 2: The Schematic

Here's the schematic,
I separate them, because I can not put one screen on one time screenshot...
I assume, you guys have the ability on drawing the PCB since I don't include the PCB drawing here.
Next step is creating the code and compile it...

Step 3: The Code and Uploading to Your Board

In this step,

We create the code for this experiment,
I used AVR Studio for it and uploaded with USBASP, see the photo

complete code :
#include <avr/io.h>
#include <util/delay.h>

// structure to allow bit field operations, name conversions: PORTA.0 -> PORT_A.b0  PORTB.7 -> PORT_B.b7
typedef struct{ uint8_t b0:1;
                uint8_t b1:1;
                uint8_t b2:1;
                uint8_t b3:1;
                uint8_t b4:1;
                uint8_t b5:1;
                uint8_t b6:1;
                uint8_t b7:1; } bits;

// define all the ports of your microcontroller, add more ports depending on the available mcu ports
#define PORT_D (* (volatile bits *) &PORTD)
#define PIN_D (* (volatile bits *) &PIND)
#define DDR_D (* (volatile bits *) &DDRD)

#define PORT_G (* (volatile bits *) &PORTG)
#define PIN_G (* (volatile bits *) &PING)
#define DDR_G (* (volatile bits *) &DDRG)

//Mention Clock frequency here
#define _XTAL_FREQ 8000000

#define lcd_data_pin PORTA

#define en PORT_D.b0
#define rs PORT_D.b1
#define rw PORT_D.b2


void lcd_init();
void lcd_data(unsigned char data1);
void lcd_cmd(unsigned char cmd);
void lcd_control(unsigned char cmdordata);
void lcd_string(unsigned char *str);


void lcd_init(){
   
    lcd_cmd(0x30);
_delay_ms(10);     
    lcd_cmd(0x38);
_delay_ms(10);     
    lcd_cmd(0x0F);
_delay_ms(10);
    lcd_cmd(0x80);
_delay_ms(10);

}

void lcd_data(unsigned char data1)
{
    
   
    lcd_data_pin = data1;// & 0x0F;
      en=1;
        rs=1;
        rw=0;
        _delay_ms(10);
        en=0;
       
}

void lcd_cmd(unsigned char cmd){
    lcd_data_pin = cmd ;
    
  en=1;
        rs=0;
        rw=0;
        _delay_ms(10);      
        en=0;
       
}



void lcd_string(unsigned char *str){

    while(*str){
        lcd_data(*str++);      
    }

}




int main(){

    DDR_D.b0 = 1;
DDR_D.b1 = 1;
DDR_D.b2 = 1;
    DDRA = 0xFF;

    lcd_init();
   
   
    while(1){
    _delay_ms (10);
  lcd_cmd(0x80);//put the cursor into the first row
        _delay_ms (10);
        lcd_cmd(0x01);//Clear display
     _delay_ms (10);
        lcd_cmd(0xC0);//goto second row
        _delay_ms (10);
       lcd_cmd(0x01); //Clear display

    lcd_cmd(0x80);//put the cursor into the first row
        _delay_ms (10);
        lcd_cmd(0x01);//Clear display
     _delay_ms (10);
       lcd_string("Message");
    lcd_cmd(0xC0);//goto second row
       lcd_string("Flasher");
    _delay_ms(1000);
     //next screen
      
    lcd_cmd(0x80);//put the cursor into the first row
        _delay_ms (10);
        lcd_cmd(0x01);//Clear display
     _delay_ms (10);
    lcd_string("With ATMEGA128");
    lcd_cmd(0xC0);//goto second row
       lcd_string("By arick");
    _delay_ms(1000);
    //next screen
   
    lcd_cmd(0x80);//put the cursor into the first row
        _delay_ms (10);
        lcd_cmd(0x01);//Clear display
     _delay_ms (10);
       lcd_string("Published on");
    lcd_cmd(0xC0);//goto second row
       lcd_string("Instructable.com");
    _delay_ms(1000);
    //next screen
    lcd_cmd(0x80);//put the cursor into the first row
        _delay_ms (10);
        lcd_cmd(0x01);//Clear display
     _delay_ms (10);
       lcd_string("Made in");
    lcd_cmd(0xC0);//goto second row
       lcd_string("AUSTRALIA");
    _delay_ms(1000);


     
    }
   
    return (0);
}

Step 4: Test It and Enjoy Your Message Flasher ==> Video ;)

Test it and enjoy your message flasher ==> Video ;)

About This Instructable

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