# Title Team Members TA Documents Sponsor
8 Hearing Damage Detector and Alarm System
Alex Yuan
Jake Fava
Jinzhi Shen
Hojoon Ryu design_document7.pdf
# Hearing Damage Detector and Alarm System

Team Members:
- Alex Yuan (ayuan20)
- Jinzhi Shen (jinzhis2)
- Jake Fava (jfava2)

# Problem

Middle and high school musicians can be subjected to harmful levels of noise on a daily basis between rehearsals, practice sessions, and performances. Cheap and effective hearing protection is available, but many students neglect using it until they start noticing the effects of their hearing damage years later.

# Solution

Our solution is a device that provides live feedback to musicians about their noise exposure in an attempt to encourage more regular use of existing hearing protection equipment.

# Solution Components

## Subsystem 1 - Sensor Interface (Microphone)

To capture the sound pressure levels, we’ll need a microphone that is omni-directional, responsive to the frequencies that the human ear is responsive to (about 10Hz-20kHz), and has a suitably high signal-to-noise ratio (~60dB or above). One microphone that fits these criteria is the TOM-1537L-HD-LW100-B-R.

Accompanying this microphone will be a pre-amp circuit to filter out DC noise and prepare readings to be used by the microcontroller.

## Subsystem 2 - Microcontroller Unit

Our microcontroller will need to be able to take input data from the microphone interface and turn it into useful information for the user. There are two types of feedback we’d like to be able to provide: 1 - instantaneous SPL readings in dB and 2 - integrated SPL over time (also called “sound exposure”) to gauge potential hearing damage accumulated over a session. A potential MCU to use for our device is the ATMega4808, which contains a 10-bit analog-to-digital converter and 48 kB of RAM.

Although a future version of this device could be powered by a rechargeable lithium-ion battery for the sake of portability. Due to time and scope limitations of the course, we will be powering this device via USB.

## Subsystem 3 - User Interface

To present live feedback on instantaneous SPL, the device could feature a series of LEDS that light up in response to recorded dB. They should range from green for safe sound levels up to red for potentially dangerous sound levels.

To present a report of sound exposure over the course of a session, we will plan to pull the data from the device onto a computer (just like the computers that would be located in a practice room or classroom) and perform the necessary integration operation there to conserve system resources. This operation will produce a report detailing the amount of sound exposure and what hearing damage it has the potential to cause.

# Criterion For Success

1. The device needs to be able take a signal from a microphone and accurately calculate SPL from the data.
2. The device needs to be able to display instantaneous SPL data in the form of lit-up LEDs
3. The device needs to be able to upload recorded SPL data to a computer to perform the integration and generate a report.

Modularized Electronic Locker

Jack Davis, Joshua Nolan, Jake Pu

Modularized Electronic Locker

Featured Project

Group Member: Jianhao (Jake) Pu [jpu3], Joshua Nolan [jtnolan2], John (Jack) Davis [johnhd4]


Students living off campus without a packaging station are affected by stolen packages all the time. As a result of privacy concerns and inconsistent deployment, public cameras in Champaign and around the world cannot always be relied upon. Therefore, it can be very difficult for victims to gather evidence for a police report. Most of the time, the value of stolen items is small and they are usually compensated by the sellers (Amazon and Apple are very understanding). However, not all deliveries are insured and many people are suffering from stolen food deliveries during the COVID-19 crisis. We need a low-cost solution that can protect deliveries from all vendors.

Solution Overview:

Our solution is similar to Amazon Hub Apartment Locker and Luxer One. Like these services, our product will securely enclose the package until the owners claim the contents inside. The owner of the contents can claim it using a phone number or a unique user identification code generated and managed by a cloud service.

The first difference we want to make from these competitors is cost. According to an article, the cost of a single locker is from $6000 - $20000. We want to minimize such costs so that we can replace the traditional mailbox. We talked to a Chinese manufacturer and got a hardware quote of $3000. We can squeeze this cost if we just design our own control module on ESP32 microcontrollers.

The second difference we want to make is modularity. We will have a sensor module, a control module, a power module and any number of storage units for hardware. We want to make standardized storage units that can be stacked into any configuration, and these storage units can be connected to a control module through a communication bus. The control module houses the hardware to open or close all of the individual lockers. A household can purchase a single locker and a control module just for one family while apartment buildings can stack them into the lockers we see at Amazon Hub. I think the hardware connection will be a challenge but it will be very effective at lowering the cost once we can massively manufacture these unit lockers.

Solution Components:

Storage Unit

Basic units that provide a locker feature. Each storage unit will have a cheap microcontroller to work as a slave on the communication bus and control its electronic lock (12V 36W). It has four connectors on top, bottom, left, and right sides for stackable configuration.

Control Unit

Should have the same dimension as one of the storage units so that it could be stacked with them. Houses ESP32 microcontroller to run control logics on all storage units and uses the built-in WiFi to upload data to a cloud server. If sensor units are detected, it should activate more security features accordingly.

Power Unit

Power from the wall or from a backup battery power supply and the associated controls to deliver power to the system. Able to sustain high current in a short time (36W for each electronic lock). It should also have protection against overvoltage and overcurrent.

Sensor Modules

Sensors such as cameras, motion sensors, and gyroscopes will parlay any scandalous activities to the control unit and will be able to capture a photo to report to authorities. Sensors will also have modularity for increased security capabilities.

Cloud Support

Runs a database that keeps user identification information and the security images. Pushes notification to end-users.

Criterion for Success:

Deliverers (Fedex, Amazon, Uber Eats, etc.) are able to open the locker using a touchscreen and a use- provided code to place their package inside. Once the package is inside of the locker, a message will be sent to the locker owner that their delivery has arrived. Locker owners are able to open the locker using a touchscreen interface. Owners are also able to change the passcode at any time for security reasons. The locker must be difficult to break into and offer theft protection after multiple incorrect password attempts.

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