ECE497 Project - LED Matrix Graduation Cap

Revision as of 15:13, 7 November 2018 by Lunaj (talk | contribs) (Work Breakdown)
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thumb‎ Embedded Linux Class by Mark A. Yoder

Team members: Devon Adair, Andrew Lund

Grading Template

I'm using the following template to grade. Each slot is 10 points. 0 = Missing, 5=OK, 10=Wow!

00 Executive Summary
00 Installation Instructions 
00 User Instructions
00 Highlights
00 Theory of Operation
00 Work Breakdown
00 Future Work
00 Conclusions
00 Demo
00 Late
Comments: I'm looking forward to seeing this.

Score:  10/100

(Inline Comment)

Executive Summary

The project that we are doing involves an LED Matrix and the Beagle Bone. We are putting this matrix inside of a graduation cap. An example can be seen here:

<Insert Final Product HERE>

The above image will be inside cap and will display twitter tweets that are tweeted within the SRC during graduation. The cap also will display GIFs and animations.


The final packaged product is the LED matrix with everything wired neatly behind the matrix. There is cardboard to make sure that everything stays in place and supports the cap.

The final product looks like this:

The final circuitry for our project

This cap is powered off a power bank that supports more than 2.4 Amps.

Installation Instructions


The project is located on GitHub here:

The GitHub has a README on how to install the necessary software for this project.


Here are the links for the specific hardware we used for this project.

LED Matrix -

WIFI Dongle -

Power Bank -

Pocket Beagle -

USB Type A Female Connector -

User Instructions

Pocket Scroller Wiring

This table maps the Pocket Scroller for the Pocket Beagle to the pins on the the Pocket Beagle to eliminate the need for the scroller and reduce space.

R1 P2.10
G1 P2.8
B1 P2.6
GND P2.15
R2 P2.4
G2 P2.2
B2 P2.1
GND P1.16
A P2.32
B P2.30
C P1.31
D P2.34
CLK P1.33
LAT P1.36
OE P1.29
GND P1.22

Below is the reference to the Pocket Beagle to map to the pins given above.

Pocket Beagle Pinout



Here is where you brag about what your project can do.

Include a YouTube demo the audio description.

Theory of Operation

Give a high level overview of the structure of your software. Are you using GStreamer? Show a diagram of the pipeline. Are you running multiple tasks? Show what they do and how they interact.

Work Breakdown

List the major tasks in your project and who did what.

Date Milestone
10/28/2018 Have Falcon working without PocketScroller Cape
11/2/2018 Have twitter API reading tweets on PocketBeagle
11/4/2018 Have twitter displaying tweets on LED Matrix
11/6/2018 Figure out how to display tweets as well as sequences on LED Matrix. IE Falcon and our handwritten stuff running at the same time.
11/9/2018 Have everything fitted to cardboard so that we can wear it as well matrix and beagle running off of power bank
11/12/2018 Wrap up final documentation

Also list here what doesn't work yet and when you think it will be finished and who is finishing it.

We tried to get the twitter API to work with Falcon. However, because of a lack of documentation and an unfamiliarity with PHP, we could not get this done. Instead, we tried to get texting to the LED display to work. However, for the same reasons as the twitter API, we also couldn't get this to work! Therefore, we ended up using a weather API that prints out the current conditions of Indianapolis.

Future Work

Suggest addition things that could be done with this project.


Give some concluding thoughts about the project. Suggest some future additions that could make it even more interesting.


thumb‎ Embedded Linux Class by Mark A. Yoder