Sample Codes

16X2 Alphanumeric LCD Interfacing with ATmega16

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LCD (Liquid Crystal Display) screen is an electronic display module and find a wide range of applications. These modules are preferred over seven segments and other multi segment LEDs. When you start working with LCD modules you will start feeling the real power of MCU and your imaginations will be touching sky. The alphanumeric LCD that we are going to interface is a 16X2 alphanumeric LCD. It means the LCD can display 16 characters in each row and it has two rows. It is a HD44780 controller based LCD. There are two methods to interface any alphanumeric LCD with AVR ATmega16 microcontroller: 8-bit and 4-bit interfacing method. In 8-bit interfacing method, all the eight data pins of the alphanumeric LCD are used and in 4-bit interfacing method, only the upper 4 data pins (D4, D5, D6 and D7) of the alphanumeric LCD are used to send 8-bit data (or command) to the alphanumeric LCD from the microcontroller. In 8-bit method, the 8-bit data (or command) is sent at a time using the 8 data lines of the alphanumeric LCD but in 4-bit method, the 8-bit data (or command) cannot be sent at a time to the alphanumeric LCD. So, the upper 4 bits of data (or command) are sent first and the lower 4 bits are sent later.

In this project, we will learn How to interface a 16X2 alphanumeric LCD with AVR ATmega16 microcontroller using 8-bit interfacing method. Here, we will display “ABLab Solutions” in 1st row and “www.ablab.in” in 2nd row of the 16X2 alphanumeric LCD.

Softwares Required

• AVR Studio 4 Software
• WinAVR 2010 Software
• SinaProg Hex Downloader Software
• USBasp Driver

Hardwares Required

Name	Quantity
AVR Trainer Board-100 with ATmega16	1pc
AVR USB Programmer	1pc
RG1602A 16X2 Alphanumeric LCD Green	1pc
12V, 1A DC SMPS Adaptor	1pc
1 to 1 Connector-Female to Female	3pc
10 to 10 FRC Female to Female Connector	2pc

Video

Connection Guide

The step-by-step connection guide for 16X2 Alphanumeric LCD Interfacing with ATmega16 is as follows