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AT24C02 EEPROM Interfacing with ATmega32 and LCD Display

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EEPROM stands for electrically erasable programmable read only memory. It is a secondary storage device that once written (programmed) can hold data even when the power is removed. The EEPROM is a class of read only memory that can be electrically erased and reprogrammed. Compare this with a CD R disks they can be recorded only once. A small amount of EEPROM is also available internally on the AVR Microcontrollers. So if the volume of data you want to store is small (say few user names and password) then you can use it. The internal eeprom makes design small and simple.

But if the amount of data you want to store is large, say in order of few tens of kilobytes then you have to interface a External EEPROM chip with your AVR Microcontroller. You can store pictures, sound and long texts in these eeproms. Their are many kinds of EEPROM chip available from many manufactures. One very common family is 24C series serial EEPROMs. They are available upto 128KB in size. They uses I2C interface with host controller (Microcontroller) which is a very popular serial communication standard.

In this project, we will learn How to interface a AT24C02 EEPROM with AVR ATmega32 microcontroller and LCD Display. Here, we will write a byte of data into the AT24C02 EEPROM memory and then we will read this one byte of data from the AT24C02 EEPROM memory and we will display the read value in a 16X2 alphanumeric LCD Display. AT24C02 has a storage capacity of 2Kbit(256 bytes). The 256 byte memory is divided into pages of 8 byte each. The data communication between AVR ATmega32 microcontroller and AT24C02 EEPROM takes place through TWI communication protocol. The AVR ATmega32 microcontroller will write a byte of data(in our case ASCII value of capital letter A) into the 0x00 memory location of AT24C02 EEPROM memory through TWI communication. Then it will read the one byte data from the 0x00 memory location of AT24C02 EEPROM memory through TWI communication and it will display the read value in the 16X2 alphanumeric LCD.

Softwares Required

Hardwares Required

Name Quantity
AVR Trainer Board-100 with ATmega32 1pc
AVR Trainer Board-100 with ATmega16 1pc
12V, 1A DC SMPS Adaptor 1pc
EEPROM & RTC Board with AT24C02 1pc
RG1602A 16X2 Alphanumeric LCD Green 1pc
1 to 1 Connector-Female to Female 3pc
10 to 10 FRC Female to Female Connector 3pc

Circuit Diagram

Video

Connection Guide

The step-by-step connection guide for AT24C02 EEPROM Interfacing with ATmega32 and LCD Display is as follows

  • Steps - 1 ( 0f 9 )

    Insert the DC Pin of 12V, 1A DC Adapter to the DC Socket of AVR Trainer Board-100.

  • Steps - 2 ( 0f 9 )

    Connect PortB header with LCD data header in AVR Trainer Board-100 with a 10 to 10 FRC Female Connector.

  • Steps - 3 ( 0f 9 )

    Connect RS, RW & EN pins of LCD control header with PD0, PD1 & PD2 pins of PortD header respectively in AVR Trainer Board-100 with 1 to 1 Connectors.

  • Steps - 4 ( 0f 9 )

    Connect the 16X2 Alphanumeric LCD to the LCD header of AVR Trainer Board-100.

  • Steps - 5 ( 0f 9 )

    Connect the EEPROM & RTC header of EEPROM & RTC with PortC header of AVR Trainer Board-100 with a 10 to 10 FRC Female Connector.

  • Steps - 6 ( 0f 9 )

    Connect the ISP header of AVR Trainer Board-100 with AVR USB Programmer header of AVR USB Programmer with a 10 to 10 FRC Female Connector.

  • Steps - 7 ( 0f 9 )

    Connect the AVR USB Programmer to the PC/Laptop's USB Port directly or with the help of USB AM-AF Cable.

  • Steps - 8 ( 0f 9 )

    Switch on the power with the help of Power Switch of AVR Trainer Board-100.

  • Steps - 9 ( 0f 9 )

    Download AT24C02 EEPROM Interfacing with ATmega32 and LCD Display Hex file to AVR Trainer Board-100 with the help of SinaProg Hex downloader and AVR USB Programmer.

  • Insert the DC Pin of 12V, 1A DC Adapter to the DC Socket of AVR Trainer Board-100.

    Steps - 1 ( 0f 9 )

  • Connect PortB header with LCD data header in AVR Trainer Board-100 with a 10 to 10 FRC Female Connector.

    Steps - 2 ( 0f 9 )

  • Connect RS, RW & EN pins of LCD control header with PD0, PD1 & PD2 pins of PortD header respectively in AVR Trainer Board-100 with 1 to 1 Connectors.

    Steps - 3 ( 0f 9 )

  • Connect the 16X2 Alphanumeric LCD to the LCD header of AVR Trainer Board-100.

    Steps - 4 ( 0f 9 )

  • Connect the EEPROM & RTC header of EEPROM & RTC with PortC header of AVR Trainer Board-100 with a 10 to 10 FRC Female Connector.

    Steps - 5 ( 0f 9 )

  • Connect the ISP header of AVR Trainer Board-100 with AVR USB Programmer header of AVR USB Programmer with a 10 to 10 FRC Female Connector.

    Steps - 6 ( 0f 9 )

  • Connect the AVR USB Programmer to the PC/Laptop's USB Port directly or with the help of USB AM-AF Cable.

    Steps - 7 ( 0f 9 )

  • Switch on the power with the help of Power Switch of AVR Trainer Board-100.

    Steps - 8 ( 0f 9 )

  • Download AT24C02 EEPROM Interfacing with ATmega32 and LCD Display Hex file to AVR Trainer Board-100 with the help of SinaProg Hex downloader and AVR USB Programmer.

    Steps - 9 ( 0f 9 )

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