Project

# Title Team Members TA Documents Sponsor
54 Affordable Portable MIDI Keyboard Synthesizer
 David Gutzwiller
Richard Engel
Sujay Murali
 Akshatkumar Sanatbhai Sanghvi design_document2.pdf
final_paper1.pdf
photo1.jpg
photo2.jpg
photo3.JPG
presentation1.pptx
proposal1.pdf
video
Team Members:
- Richard Engel (reengel2)
- Sujay Murali (sujaym2)
- David Gutzwiller (davidjg3)

# PROBLEM

One desirable quality for musical production instruments is portability. For many production setups, it can be difficult for musicians to take all of their gear with them, so it's convenient for them to own a robust portable synthesizer keyboard. However, another issue is the cost. There are many options available for compact portable synthesizers, but they tend to be hundreds or even thousands of dollars. This is especially intimidating for anyone trying to get into music production.

# SOLUTION

Our proposal is for a low-cost keyboard synthesizer. The instrument is both simple enough to save on cost, but also has enough features to be highly versatile for musicians. The keyboard would feature two octaves of range with an octave changer and pitch bend wheel, along with input knobs for volume, waveform synthesis, and ADSR envelope. These features would be enough to make this a cheap but robust portable instrument for any producer.

# SOLUTION COMPONENTS

## USER INPUT
User input would consist of one octave of keyboard keys, an octave changer and pitch bend wheel, and nine input knobs. One knob would be for volume, four would be for basic waveform synthesis (sine, square, sawtooth, triangle), and the last four would control an Attack Decay Sustain Release (ADSR) envelope for the notes. Each key will have two sensors: one sensor or switch to detect when a key is pressed, and one sensor to read the velocity of that key when pressed. Each input knob would be a potentiometer. The octave changer would also have switches to activate, and the pitch bend wheel would be bought off the shelf.

## CONTROL
A microcontroller would take in the input values and velocities from key presses along with the volume, waveform, and ADSR knobs to generate and output sound and midi messages.

## OUTPUT
The output would consist of both a built-in speaker that can directly transmit sound from the device and a USB port that can hook up to a computer that would transmit MIDI messages from the instrument.

## POWER
Power would be provided either by a rechargeable battery built into the instrument or by a power supply plugged into the wall that would both power the device and charge the battery. There would also be an LED indicator displaying battery life/charging.

# CRITERIA FOR SUCCESS
- All keys, knobs, ports, and indicators are functional
- Outputs audio through a built-in speaker
- Outputs MIDI via USB to computer
- Battery lasts at least 3 hours

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.