Ok, so this was just a hobby project. I was avid for Arduino projects back in 2015 and this is one of the results of tinkering.
I came by this amazing project from instructables(http://www.instructables.com/id/810-LED-Matrix-with-4017/) and decided to work on it myself.
Outline of the project
Basically, this is just a grid of LEDs. You arrange and solder them so that all the anodes are connected in each row and the cathodes are connected in each column.
As you can see, this involves considerable amount of soldering.
By applying a voltage on one pair of these rows and columns, you can light on a LED that corresponds to the pair.
Actually, in this project, you will light row by row, from top to bottom to make a picture. The refresh rate should be fast enough to make an illusionary effect.
So what you need is the following 4 things.
- Electrically controlled switches. Transistors!
- A device to sequentially pick one row one at a time. A decade counter!
- A device to save row data. A shift register!
- A processor to mediate all these. Arduino UNO!
The above picture is the final assembly on PCB.
You can check out more details about this project from the link below.
The most important thing that I learned from this project was the need of more safe environment to work. I was so lucky to have no accidents.
Also, I found that a good tip for the welder and use of thin single-core solder dramatically increased the quality of the soldering. The wicks were also super useful.
Better documentation of the project could have been helpful.
A heart displayed on the matrix for Tae-yu. I love you Tae-yu 🙂