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DIY AVR Programmers

For those who are trying to make AVR kit at home, an AVR programmer which can be simple to make will be really useful, as it'll avoid buying the programmer!! Here I'm giving a few webpage links on how to make a programmers yourself. - Here is a simple AVR serial programmer, works with PC serial port, easy to make For complete info check out the webpage: AVR Serial programmer from Extremeelectronics.co.in - ...

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Multitasking in AVR (A demo to run 7 tasks on an atmega32)

Introduction:      Switching multiple tasks on a same CPU is the one of the major function of an operating system. What I did now is a time sharing multitasking (time multiplexing) on an AVR. Here an atmega32 is configured to use Round-Robin Multitasking. Round-Robin allows quasi-parallel execution of several tasks. Tasks are not really executed concurrently but are time-sliced (the available CPU time is di ...

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An attempt to show grayscale images on an LED dot matrix display with software PWM using PIC16F877A

Introduction: This is just a time pass hobby project, I am trying to display some pictures (JPEG/PNG/BMP etc) on my 8x8 led dotmatrix display.  You can see photos of my 8x8 led dotmatrix display showing some grayscale pictures. The main thing which you may notice is that the brightness of each led depends on the picture information respective to the scaled(8x8) pixel of the original picture.The original pic ...

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AVR based monochrome signal generation for a PAL TV using atmega16 micrcontroller

Introduction: I have learned some thing about TV in one of my B.tech semester but I forgot most of them. Now I refreshed a few basics and tried to implement a monochrome PAL TV signal generator using an AVR micrcontroller. I was using PIC earlier but later I jumped to AVR because I loves the USBASP programmer, the free avr-gcc compiler and the user friendly architecture of AVR microcontroller .Also at any t ...

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Drawing geometric figures on a PAL TV using ATmega32 (128×64 resolution)

Introduction: I am interested to draw lines, square, rectangle, circle etc on my TV screen. At first I was confused where to start. While thinking about it, a pencil and an eraser came to my mind. If we have a good pencil, eraser and a paper, then we can draw on it according to our own logic. If we use the pencil with compass and scale, we can draw circle, line, box etc on the paper. This is the basic idea ...

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Running PYTHON (pymite-09) on an Arduino MEGA 2560 using atmega16 micrcontroller

Now it is the first time I am using an arduino board. Arduino mega 2560 is really a great product. The chip got a flash of 256KB, RAM of 8KB and EEPROM of 4KB. Also, the data sheet of Atmega2560 says that we can extend the RAM (by external) upto 64KB. Another most important feature of this stuff is that it have 54 Digital I/O pins (of which 14 provide PWM output). It is clocked with a 16MHz crystal osc. Als ...

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Generating AUDIO ECHO using Atmega32 microcontroller

Introduction: But now I can do this very easily by a simple digital signal processing using a microcontroller. It's concept is very simple, ie we need to apply a proper delayed feedback in digital samples with in a circular buffer. I did this using an atmega32 microcontroller and it worked fine. This is simple but really an interesting project. Not only an echo, but we can do a lot of fun with this type of ...

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