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LED DOT Matrix Pong using ATMega16 Microcontroller

The classic pong game. Two players. Press the buttons to move paddles up/down. Ball bounces back and forth. If you fail to catch it, your opponent gets one point. Score difference is showed with blue LEDs. Blue LED = lead by one point. If you then win another point, you win the game, and your player number ("1" or "2") is displayed.   [caption id="attachment_8761" align="aligncenter" width="563"] DivX ...

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How to control Stepper Motor using AT89C51 Microcontroller

As explained in earlier article, Stepper motor is operated by energizing the stator coils in an ordered sequence. When the input sequence of signal is applied to the motor leads, it starts rotating in steps. AT89C51 microcontroller has a current rating of 50mA. It can neither source nor sink huge current. ULN2003 is high voltage and high current Darlington array IC. Each input-output pair in ULN2003 acts as ...

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LED Menorah using ATtiny13 microcontroller

Last week on hack-a-day I saw their post on an LED Menorah that was powered by a 9v battery with the lights controlled by dip switches. I thought to myself, “gee, that’s not a very creative design”. There was redemption in the minimalist designs linked too showing a menorah soldered to a tiny2313 and one soldered to an LM2913, both without a circuit board. These free formed designs were creative but a littl ...

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PS/2 to C64 Mouse Adapter using ATmega8 microcontroller

A pixel artist friend of mine wanted a mouse to try his skills on a real C64. I thought I could help him by making an adapter that would allow a regular PS/2 mouse to be used with a Commodore 64. The most popular and supported C64 mouse is 1351 mouse which uses analog capabilities of joystick control ports to send movement data. Same mouse also has a joystick compatibility mode that emulates joystick tilt i ...

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MP3 Player using ATMega128 microcontroller

History I decided to do this project for several reasons: first I like music, second I have a huge collection of MP3, and third I wanted to be able to play them anytime in my living room. I began the project with one major restriction, the printed circuit board of MP3 player MUST be single side in order to do it myself.  After 2 months of drawing, I realized this project was in fact ‘feasible’! One major ch ...

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How to drive 595 shift registers with AVR hardware SPI using ATmega168 microcontroller

Driving a shift register using an AVR chip’s built-in hardware is really quite easy. Most of their offerings have an SPI module, or Serial Peripheral Interface. A shift register is exactly that, a peripheral device that communicates via a serial line. All we need to do is hook up our connections and use a few pieces of simple code. Join me after the break to see how that’s done. Just want to know how shift ...

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LED Matrix Display using TD62783 microcontroller

Last Sunday I gave a workshop in TOG as part of it’s Engineers Week 2011 activities. We spent the day assembling a 8×8 Red/Green LED Matrix Display circuit which I designed in strip board. The circuit forms an interface between a micro controller and a 8 by 8 Dual Colour Common Anode LED Module. This type of module has two LEDs per pixel, each row has 8 pixels, with 8 rows. The anodes of each LED in a row a ...

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