View source for Interfacing LCDs with Atmega128 Breakout ← Interfacing LCDs with Atmega128 Breakout

[[category:Atmega128 Breakout]]
In this tutorial let's interface a 16x1,16x2 and 20x4 character display with AVR breakout board.
For this tutorial we will require a [https://www.exploreembedded.com/product/LCD%20Breakout%20Board%20for%2016x1%2016x2%2020x4%20128x64 LCD Breakout].
=Basics=
LCD can be interfaced with Atmega128 breakout in two modes i.e. 8 bit and 4 bit. Let's
interface it in 4 bit mode.We will connect the display in 4 bit mode. You can change it to 8 bit mode making changes in connections and corresponding code. Hardware connections remain same for LCD 16x1,16x2,20x4 as shown in hook up.<br>
Refer [[LCD_16_x_2_Interfacing_with_8051|8051 Tutorial]] for basics of character LCDs
=Hook Up=
[[File:0Interfacing LCDs with Atmega128 Breakout bb.png |none]]

=Code=
=LCD 16 x 1=
<syntaxhighlight>
#include "lcd.h"
int main() 
{
    /*Connect RS->PB0, RW->PB1, EN->PB2 and data bus to PORTC.4 to PORTC.7*/
    LCD_SetUp(PB_0,PB_1,PB_2,P_NC,P_NC,P_NC,P_NC,PC_4,PC_5,PC_6,PC_7);
    LCD_Init(1,16); 
    LCD_DisplayString("Explore");
    while(1);
    return (0);
}
</syntaxhighlight>

=LCD 16 x 2=
<syntaxhighlight>
#include "lcd.h"
int main() 
{
    /*Connect RS->PB0, RW->PB1, EN->PB2 and data bus to PORTC.4 to PORTC.7*/
    LCD_SetUp(PB_0,PB_1,PB_2,P_NC,P_NC,P_NC,P_NC,PC_4,PC_5,PC_6,PC_7);
    LCD_Init(2,16);
    
    LCD_DisplayString("Explore Embedded");
    LCD_DisplayString("Lcd 4-bit Mode");
    while(1);
    
    return (0);
}
</syntaxhighlight>

=LCD 20 x 4=
<syntaxhighlight>
#include "lcd.h"
int main() 
{
    /*Connect RS->PB0, RW->PB1, EN->PB2 and data bus to PORTC.4 to PORTC.7*/
    LCD_SetUp(PB_0,PB_1,PB_2,P_NC,P_NC,P_NC,P_NC,PC_4,PC_5,PC_6,PC_7);
    LCD_Init(4,20);
    
    LCD_DisplayString("Explore Embedded\n");
    LCD_DisplayString("LCD 4-bit Mode\n");
    LCD_DisplayString("20 x 4 \n");
    LCD_DisplayString(":)  :O");
	
    while(1);
    
    return (0);
}
</syntaxhighlight>

=Demo=
The image below shows 16x2 LCD interfaced AVR breakout.
<br/>
[[File:Interfacing LCDs with Atmega128 Breakout 162.JPG|none]]
<gallery>
file:lcd16x1_avr.JPG|16x1 LCD
file:lcd20x4_avr.JPG|20x4 LCD
</gallery>

=Downloads=