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Project Notes

#305 KeyboardMatrixModule/LedControl

Demo controlling the LEDs on a simple pushbutton/LED matrix module

Build

Notes

See LEAP#303 KeyboardMatrixModule for details of the module I am testing here.

It features 8 LEDs. I’ll test these with a simple direct-control program running on an Arduino.

8 LEDs

The board features 8 red LEDs with 1kΩ (102) current-limiting resistors and corresponding pins D1-8.

With VCC connected to power, when any pin D1-8 is pulled to ground the corresponding LED will light.

Test Program

The LedControl.ino sketch does no more than switch the LEDs on in order.

Construction

Breadboard

Schematic

Build

Credits and References

About LEAP#305 ArduinoLED
Project Source on GitHub Return to the LEAP Catalog

This page is a web-friendly rendering of my project notes shared in the LEAP GitHub repository.

LEAP is my personal collection of electronics projects, usually involving an Arduino or other microprocessor in one way or another. Some are full-blown projects, while many are trivial breadboard experiments, intended to learn and explore something interesting (IMHO!).

The projects are usually inspired by things found wild on the net, or ideas from the sources such as:

Feel free to borrow liberally, and if you spot any issues do let me know. See the individual projects for credits where due. There are even now a few projects contributed by others - send your own over in a pull request if you would also like to add to this collection.