Transcript Scrolling LED Project - - iDesign

Scrolling LED Project
Michael Turovskiy
IME 458
Dr. Jianbiao Pan
6/5/2013
My Scrolling LED
My Scrolling LED
• I purchased a starter kit from Carl’s Electronics
at the beginning of the quarter because I
thought that a Scrolling LED was something
that I would actually use.
– I didn’t realize how much work it was going to be,
but I really enjoyed every minute of working on it.
• Especially, since IT WORKED!!
My Scrolling LED
• The purpose of this project was to become more
familiar with microelectronics components and layouts.
• Through this project I was able to accurately measure
and draw out the various components that will go on
my PCB. I was able to make a functioning schematic
and layout. I used the program DipTrace to accomplish
these tasks.
• Finally, I was able to assemble all of the necessary
parts, and found out that I had a skill for soldering
small components to a PCB without any issues.
My Scrolling LED Schematic
My Scrolling LED Layout
My PCB
My PCB
• In total my PCB has 42 components!!
• The 8x8 LED matrix is able to work using only 3
shift regulators because each row of LED’s is
connected to each other. This allows each
regulator to control the 8 rows on each LED
matrix.
– There is actually a function on the Scrolling LED to
show how this works!!
– You can see how the LED is rastering the various rows,
but it does it so quickly that your eye can not detect a
change.
My Scrolling LED
Demonstration!!!
Hopefully you can see it!! 
My Scrolling LED
• If you missed that… it said…
• “Hi, my name is Michael and this is my
Scrolling LED Project for IME/MATE 458. Thank
You!! ”
– This message can be changed at any time using
the 4 tact switches on the front of the board.
The Front of My Scrolling LED
The Front of My Scrolling LED
• The majority of my components (and everyone’s
components) are on the front of my PCB.
– I did my best to orient my components so that they would
take up the least amount of space on the board.
• I included 4 mounting holes on each corner of the
board.
• I included 3 fiducials on three corners of the board.
• I also have a silk screen on the board that lays out
exactly where all of the components should go, and
which orientation they needed to be in to function
correctly.
• The board is run through a 9V battery
The Front of My Scrolling LED
• Bill Of Materials
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1 18 pin PIC microcontroller
3 8x8 LED Array’s
8 470 Ω resistors
9 2222 A transistors
1 LM317 regulator
2 0.1 µF ceramic capacitors
1 1 kΩ resistor
4 10 kΩ resistors
1 7805 regulator
4 tact switches
1 680 Ω resistor
1 22 µF electrolytic capacitor
1 power input (1.3x2.5 mm jack)
The Back of My Scrolling LED
The Back of My Scrolling PCB
• You will notice that I have components on
both the back and front of my PCB.
– This was done to reduce space on the PCB.
• The 3 parts you see on the back are the 3
74AC164 shift registers controlling the 3 8x8
LED array’s on the front.
Conclusion
• This project was extremely beneficial in my
growing understanding of electronic
components. I may not know exactly how my
Scrolling LED project works, but I feel that it is
a huge step that I was able to start from
scratch (almost) and create a functioning PCB.
Future Work
• The starter kit came with 2 more resistors, and it would be
interesting to see how the LED’s function differently based
on which resistor is used.
• It would be beneficial to order original parts from Digi-key
and see if they work the same way as the components sent
by Carl’s Electronics.
• It would also be a great challenge to try to make the PCB
for this Scrolling LED project even more condensed.
– There is some “white space” where components could
potentially fit.
• Making a package, such as a belt, to encapsulate the
Scrolling LED and make it even super COOLER than it
already is!!
Thank You!!
• Questions?