Project

# Title Team Members TA Documents Sponsor
34 NAND/NOR Logic Gate Replacement Training Tool
 Jeremy Diamond
Matthew Lagreca
 Xinrui Zhu appendix0.zip
design_document0.pdf
design_document0.pdf
final_paper0.pdf
other0.png
presentation0.pptx
proposal0.pdf
This proposal is an adaptation to the Logic Circuit Teaching Board from Spring 2015 (#3).

Our group both benefited from an early start to the engineering learning process in high school through Project Lead the Way (PLTW) courses. There were classes in a variety of different engineering fields, but the one that led us to ECE was the Digital Electronics class. Here we got exposure to basic laws of circuits, such as KVL and KCL, as well as to circuit implementation of Boolean logic.

In our introductory classes in ECE, we covered the conversion of certain logic gates to their NAND equivalent with the goal of reducing the number of necessary IC chips in a circuit. The project we are proposing is a two-part board, with pieces representing two input-one output logic gates. One side holds the original implementation using AND, OR, and Inverter gates, while the other side holds either NAND or NOR gates. The goal is to match the resulting outputs of the two sides, which will be displayed by some sort of indicator.

To track the logic that is currently plugged into each side of the circuit, we will display the truth tables of the given setup.

Parts of the project:
-Casing and board design simulating up to a 3-input and 2-output circuit
-Power supply from the wall
-Control circuit that displays the truth table based off the circuit plugged in
-Comparator circuit that will see if the truth tables for both sides match

Electronic Replacement for COVID-19 Building Monitors @ UIUC

Patrick McBrayer, Zewen Rao, Yijie Zhang

Featured Project

Team Members: Patrick McBrayer, Yijie Zhang, Zewen Rao

Problem Statement:

Students who volunteer to monitor buildings at UIUC are at increased risk of contracting COVID-19 itself, and passing it on to others before they are aware of the infection. Due to this, I propose a project that would create a technological solution to this issue using physical 2-factor authentication through the “airlock” style doorways we have at ECEB and across campus.

Solution Overview:

As we do not have access to the backend of the Safer Illinois application, or the ability to use campus buildings as a workspace for our project, we will be designing a proof of concept 2FA system for UIUC building access. Our solution would be composed of two main subsystems, one that allows initial entry into the “airlock” portion of the building using a scannable QR code, and the other that detects the number of people that entered the space, to determine whether or not the user will be granted access to the interior of the building.

Solution Components:

Subsystem #1: Initial Detection of Building Access

- QR/barcode scanner capable of reading the code presented by the user, that tells the system whether that person has been granted or denied building access. (An example of this type of sensor: (https://www.amazon.com/Barcode-Reading-Scanner-Electronic-Connector/dp/B082B8SVB2/ref=sr_1_11?dchild=1&keywords=gm65+scanner&qid=1595651995&sr=8-11)

- QR code generator using C++/Python to support the QR code scanner.

- Microcontroller to receive the information from the QR code reader and decode the information, then decide whether to unlock the door, or keep it shut. (The microcontroller would also need an internal timer, as we plan on encoding a lifespan into the QR code, therefore making them unusable after 4 days).

- LED Light to indicate to the user whether or not access was granted.

- Electronic locking mechanism to open both sets of doors.

Subsystem #2: Airlock Authentication of a Single User

- 2 aligned sensors ( one tx and other is rx) on the bottom of the door that counts the number of people crossing a certain line. (possibly considering two sets of these, so the person could not jump over, or move under the sensors. Most likely having the second set around the middle of the door frame.

- Microcontroller to decode the information provided by the door sensors, and then determine the number of people who have entered the space. Based on this information we can either grant or deny access to the interior building.

- LED Light to indicate to the user if they have been granted access.

- Possibly a speaker at this stage as well, to tell the user the reason they have not been granted access, and letting them know the

incident has been reported if they attempted to let someone into the building.

Criterion of Success:

- Our system generates valid QR codes that can be read by our scanner, and the data encoded such as lifespan of the code and building access is transmitted to the microcontroller.

- Our 2FA detection of multiple entries into the space works across a wide range of users. This includes users bound to wheelchairs, and a wide range of heights and body sizes.