Tag Archives: atmega32

Easy 24C I2C Serial EEPROM Interfacing with AVR Microcontrollers

In this turorial we will see how we can easily interface a 24C series serial EEPROM with AVR microcontrollers. What is an EEPROM? An EEPROM is kinds of novalatile memory, that means it is used for storing digital data permanently without any power suply. EEPROM stands for Electrically Erasable Programmable Read Only Memory. The advantage of these kind of ROMs is that they can be erased Electrically to make them ready for storing new data. 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 chips. 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 MCU. 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 (MCU) which is a very popular serial communication standard. I […]

PWM Signal Generation by Using AVR Timers.

In the last tutorial you saw how the PWM technique helps us generate analog signals from a microcontroller. In this tutorial we will see how PWM generation is implemented with microcontrollers. Before you begin please see Introduction to PWM Introduction to AVR Timers Generation of PWM signals is such a common need that all modern microcontrollers like AVR has dedicated hardware for that. The dedicated hardware eliminates the load of generation of PWM signal from software (thus frees the CPU ). Its like asking the hardware to generate a PWM signal of a specific duty cycle and the task of CPU is over. The PWM hardware with start delivering the required signal from one of its PINs while the CPU can continue with other tasks. In AVR microcontrolers PWM signals are generated by the TIMER units. (See AVR Timer Tutorials) . In this tutorial I will give you the basic idea of how PWM signals are generated by AVR timers. Their are two methods by which you can generate PWM from AVR TIMER0 (for ATmega16 and ATmega32 MCUs). Fast PWM Phase Correct PWM Don’t worry from their names they will become clear to you as we go on. First we will be considering the Fast PWM mode. PWM Generation Fundas We will use the simplest timer, TIMER0 for PWM generation.(Note […]

Using the USART of AVR Microcontrollers : Reading and Writing Data

Till now we have seen the basics of RS232 communication, the function of level converter and the internal USART of AVR micro. After understanding the USART of AVR we have also written a easy to use function to initialize the USART. That was the first step to use RS232. Now we will see how we can actually send/receive data via rs232. As this tutorial is intended for those who are never used USART we will keep the things simple so as to just concentrate on the "USART" part. Of course after you are comfortable with usart you can make it more usable my using interrupt driven mechanism rather than "polling" the usart. So lets get started! In this section we will make two functions :- USARTReadChar() : To read the data (char) from the USART buffer. USARTWriteChar(): To write a given data (char) to the USART. This two functions will demonstrate the use of USART in the most basic and simplest way. After that you can easily write functions that can write strings to USART. Reading From The USART : USARTReadChar() Function. This function will help you read data from the USART. For example if you use your PC to send data to your micro the data is automatically received by the USART of AVR and put in a buffer […]

xBoard™ :: ATmega32 Development Board.

Here are some Videos that demonstrate the xBoard – a easy to use but powerful development system for Atmel AVR ATmega32 microcontrollers. For complete information about the xBoard™ see http://xBoard.eXtremeElectronics.co.in Video #1 xBoard™ :: AVR Dev-Board – Introduction This video tutorial gives you a quick introduction of the xBoard; easy-to-use and powerful Atmel AVR AtMega32 Microcontroller Development Board. Video #2 xBoard™ :: AVR Dev-Board – Hello World In this tutorial we will introduce you to the basic steps needed set-up and develop programs for the xBoard. We’ll write a LED blinking project which is a Hello World project for microcontroller arena. xBoard – a easy-to-use and powerful Atmel AVR AtMega32 Microcontroller Development Board. Video #3 xBoard™ :: AVR Dev-Board – LCD Interfacing This video tutorial teaches you how you can interface a standard 16×2 LCD Module with the xBoard – easy-to-use and powerful Atmel AVR AtMega32 Microcontroller Development Board. Video #4 xBoard™ :: AVR Dev-Board – IR-Remote This video tutorial shows you how to interface a DVD Player Infrared Remote Control with the xBoard, a easy-to-use and powerful Atmel AVR AtMega32 Microcontroller Development Board.