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2 Mar 2011

8×8 Bicolor LED Matrix. Columns controlled by MAX6964 (17 LED PWM Controller), Rows by 74HCT138 (3-8Mux). Interfaced to ATMega32 via I2C.

8×8 Bicolor LED Matrix – [Link]

2 Mar 2011

konstant.in writes:

Several old 27C256 EPROMS were lying around unused. So I thought about a purpose for them. As I also had some 8×8 LED matrices, a little animated display came to mind. With each frame consisting of 8×8 pixels the 32kByte EPROM can hold 4096 frames. Each byte holds one line of the display, eight bytes one frame.

EEPROM animation display – [Link]

24 Feb 2011

Tact switches are widely used as digital input devices. Normally one tact switch requires one digital I/P pin of a microcontroller but if you want to interface a matrix of such switches (say a 16 digit keypad), assigning a digital I/O pin for each key won’t be a good idea. You need to think about the way to minimize the required number of digital I/O pins of microcontroller. A very popular method is a keypad matrix where the keys are arranged into rows and columns so that a 4×4 (16) tact switches can be interfaced to a microcontroller using only 4+4 = 8 I/O pins. [via]

Theory of Matrix Keypad – [Link]

21 Feb 2011

A matrix keypad uses rows and column arrangement of keys to reduce the required number of I/O pins for interfacing with a microcontroller. This article shows how you can use a 555 Timer IC to interface a keypad with just 2 connections. The 555 timer is configured in astable multivibrator where the output frequency changes with each key press. Based on how many times the Timer module overflows, the information about the pressed key is determined.

2-Wire Keypad Interface with a 555 Timer – [Link]

15 Feb 2011

Syst3mX writes:

In this instructable I will show you how to build a quite fancy 8 by 10 L.E.D matrix(with scrolling text and animations) using the Arduino and 4017 decade counter. This type of matrix is easy to make and program and it is a good way learn how to multiplex.

Make a 8×10 L.E.D Matrix – [Link]

15 Feb 2011

Syst3mX writes:

After making a 8X10 matrix a lot of people asked me about expanding the matrix to some thing bigger, and some wanted to write stuff to the matrix via a PC, so one day I looked at a pile of LEDs that I had leftover from a LED cube projected and I decided to make a bigger matrix with all the things people wanted.

So what are you waiting for? Get those LEDs out and heat up your soldering iron because we are about to make a 24X6 LED matrix!

Make a 24X6 LED matrix – [Link]

31 Jan 2011

The project is an array of 256 LEDs which is capable of displaying a massive amount of information. [via]

Matrix with 256 LEDs - [Link]

24 Jan 2011

Fabien Royer writes:

As part of a netduino hacking tutorial that I’m authoring with my friend Bertrand, I wrote a set of classes designed to drive an 8×8 LED matrix relying on persistence of vision.

The code and details are located here. The netduino tutorial is located here.

Driving an 8×8 LED matrix with a netduino using persistence of vision – [Link]

21 Jan 2011

This project shows how to build a 5×8 LED matrix controlled by Arduino and placed on a Jacket. View details on the link below.

Arduino Lilypad – 5×8 LED Jacket – [Link]

13 Jan 2011

Jer writes:

Recently, I tested the 0832 LED Matrix Board that I purchased from Sure Electronics. Since I have a simple AVR microcontroller breakout board and a PIR sensor that senses motion, I decided to make something fun using the 0832 LED Matrix Board.

Motion Activated Message Display – [Link]





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