Tag Archives: led matrix


Arduino sound direction locator

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This Arduino-based sound direction locator uses a Pac-Man like ghost that runs towards the direction of the origin of sound. It uses three microphones amplifier modules arranged in a triangle to locate the direction of the sound and an 8×8 LED grid display for output. The Arduino Uno senses the incoming audio levels from the three microphones and moves the ghost in the direction with the loudest sound detected by turning on the appropriate LEDs on the grid.

Arduino sound direction locator

Arduino sound direction locator

Check out this video showing it in action.

Embedded Lab wishes you a very happy new year

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Christmas is over and we are now geared up to say good bye to 2014 and welcome to 2015. Embedded Lab would like to wish all of our readers, supporters, and contributors a very happy and prosperous new year. May 2015 bring you all the great things in your life.

And here is the last discount coupon for this year. The discount offer starts now and will run until Jan 1st, 2015.

15% OFF using the code: 6BCF43D

Applicable to all serial seven segment LED displays, Easy Pulse sensor, and cascadable LED matrix displays.

If you are not familiar with latest Easy Matrix displays, check out this cool Bluetooth controlled scrolling LED matrix display project using these modules.

Easy Matrix display

Scrolling Easy Matrix display with Bluetooth control

Thanks a lot for your support!

Introducing Easy Matrix: A cascadable 8×8 LED dot matrix display module

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Easy Matrix is an easily cascadable 8×8 monochromatic LED dot matrix display module with onboard MAXIM’s MAX7219 LED driver chip. The MAX7219 allows you to drive the LED matrix using only three I/O pins of Arduino or any other microcontroller. The LED matrix module used in Easy Matrix has a bigger dot size (5mm) and has the overall display dimensions of 60.2mm x 60.2mm (2.4″x2.4″). It is easily cascadable in series with the help of precisely aligned male and female header pairs located on the left and right sides of the display module. With lots of freely available Arduino libraries for MAX7219 chip, this module is easy to use in any Arduino project for displaying basic text and animation.

Easy Matrix: Cascadable LED matrix display module

Easy Matrix: Cascadable LED matrix display module

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Portable Bluetooth-enabled scrolling LED matrix display- Part 2

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In Part 1 of this project, we described the construction of Easy Matrix, which is a cascadable 8×8 LED matrix display with MAX7219 chip on board. We developed an Arduino sketch for scrolling text display, whereby the Arduino receives text messages from its serial port and displays the message on a 8×40 LED matrix constructed by daisy-chaining five Easy Matrix modules. The Arduino firmware is also capable of receiving user commands for controlling the scrolling speed and brightness level of the display. In this part, we will discuss about extending the project to cascade 8 Easy Matrix modules and control the display over a Bluetooth connection.

My 3 year old son uses this often to learn alphabets and numbers

My 3 year old son loves to watch scrolling alphabets and numbers on the display

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Portable Bluetooth-enabled scrolling LED matrix display- Part 1

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LED matrix displays are great fun. They are visually charming, and readable from a far viewing distance with a much wider angle of view as compared to many other types of electronics displays. They can display all kinds of information, including text, graphics, and animation. This project is about making a portable Bluetooth-controlled 8×64 monochromatic LED matrix (total 512 LEDs) for displaying scrolling text message. I made this display to use at home parties or other occasions for displaying greeting messages. The text data to be displayed can be sent from a smartphone using the Bluetooth connection. The display is Arduino-controlled and uses the HC-06 Slave Bluetooth transceiver module for receiving data from the smartphone. I am also using the Bluetooth SPP Pro (freely downloadable) App (developed by Jerry.Li) on my HTC One Android smartphone for sending text message to the matrix display. The complete project has got a nice enclosure made by myself using furring strip boards bought from the Home Depot. We looked at a similar project earlier made by Jollyfactory, who used bi-color LED matrices, which required two MAX7219 devices per 8×8 matrix.

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Bluetooth-enabled scrolling LED matrix display

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