# Title Team Members TA Documents Sponsor
46 Inventory Tracker
Alex Buchheit
Sara Alabbadi
Sooha Ryu
Jason Zhang design_document2.pdf
## Team Members

Sooha Ryu (soohar2)

Sara Alabbadi (saraa6)

Alex Buchheit (alexwb2)

## Problem

I work as a lab assistant and one of my responsibilities is to restock various supplies in the lab. I have to manually enter supplies into an excel spreadsheet when they are used so the lab supervisor knows when to purchase more. This takes a lot of time and because we do it manually we have many discrepancies in inventory. It would be easier to not have to manually take inventory and have a system that could do that.

## Solution

Our proposed solution is an inventory tracking system. This system would use either RFID or computer vision to check out and return supplies. The user that is checking them out would be assigned a PIN number or scan their iCard to check out supplies. This information would be connected to a website and display that shows each supply being used and what user is using it.

Along with that, supplies stored in drawers or cabinets could be accessed by the user through the PIN or iCard scan. The system would also determine if the drawer had been opened by an unauthorized person and send an alert to the web database.

## Solution Components

## Smart Drawer

The supply drawer could be held shut by a magnet and a current carrying wire to create a magnetic field to hold it shut. Once it is determined through RFID that the correct user wants access to the drawer, power will no longer be sent through the wire, allowing the user to safely open the drawer. A sensor will be attached to the drawer to determine if it is opened. If it is opened and current is still flowing through the wire, this will alert the system that it has been opened by force by an unauthorized person.

Possible Proximity Sensor: HC-SR04

## User Access Control

iCard will be read by an RFID system to “unlock” the drawer they have access to. The user information will be stored in the database to keep track of inventory.

Possible Microcontrollers: ATMEGA328P-AUR, STM32F401RBT6, STM32F103C8T6TR, ATMEGA32U4-AUR, ESP32

## Inventory Tracking

A system to keep track of all items in the drawers using either RFID. All the items in the drawers will have a tag/chip attached to them, so once someone checks it out or returns it, the system will be able to know the items and keep track of the inventory. The data will be updated as inventory changes with information of the user from the user access control.

Possible RFID Reader: RFID READER R/W 13.56 MHZ MOD, RFID Reader ID-12LA


Possible RFID Chip: RF37S114HTFJB, UHF RFID Tags - Adhesive


## Web Database

The database will be updated every time a user checks out or returns an item. It will also keep the records of when and who checked out what and what’s been returned. The database will also have how many items are in stock and display it with the checkout/return records. An alert message will be displayed if anyone forcefully opens the drawer.

Possible Bluetooth Module: ESP32-S3-WROOM-1-N16

## Stretch Goal

If time allows, for keeping track of inventory, we could incorporate computer vision technology instead of an RFID. For using computer vision, we plan to have weight sensors on the drawers to check if there’s been any change of inventory. If there is, the camera would be activated and the user will show the item to the camera and once it recognizes what it is, it will record it to the database and the user will be able to close the drawer. For returning, once the user scans their iCard, they will be able to open the drawers and return the items. Knowing the items that’s been checked out by the user and the change in weight in the drawer, the system will figure out the returned item and record it to the database.

# Criteria For Success

Drawers can be locked and unlocked depending on the user access

System is able to recognize items checked out and returned

The system will display the current amount of items in stock

The system should display items checked out and the users that have checked them out

It should allow supervisors to change the number in stock if they restock supplies

Web database is updated regularly with correct user information

Correctly alerts database if drawer opened by force

Musical Hand

Ramsey Foote, Thomas MacDonald, Michelle Zhang

Musical Hand

Featured Project

# Musical Hand

Team Members:

- Ramesey Foote (rgfoote2)

- Michelle Zhang (mz32)

- Thomas MacDonald (tcm5)

# Problem

Musical instruments come in all shapes and sizes; however, transporting instruments often involves bulky and heavy cases. Not only can transporting instruments be a hassle, but the initial purchase and maintenance of an instrument can be very expensive. We would like to solve this problem by creating an instrument that is lightweight, compact, and low maintenance.

# Solution

Our project involves a wearable system on the chest and both hands. The left hand will be used to dictate the pitches of three “strings” using relative angles between the palm and fingers. For example, from a flat horizontal hand a small dip in one finger is associated with a low frequency. A greater dip corresponds to a higher frequency pitch. The right hand will modulate the generated sound by adding effects such as vibrato through lateral motion. Finally, the brains of the project will be the central unit, a wearable, chest-mounted subsystem responsible for the audio synthesis and output.

Our solution would provide an instrument that is lightweight and easy to transport. We will be utilizing accelerometers instead of flex sensors to limit wear and tear, which would solve the issue of expensive maintenance typical of more physical synthesis methods.

# Solution Components

The overall solution has three subsystems; a right hand, left hand, and a central unit.

## Subsystem 1 - Left Hand

The left hand subsystem will use four digital accelerometers total: three on the fingers and one on the back of the hand. These sensors will be used to determine the angle between the back of the hand and each of the three fingers (ring, middle, and index) being used for synthesis. Each angle will correspond to an analog signal for pitch with a low frequency corresponding to a completely straight finger and a high frequency corresponding to a completely bent finger. To filter out AC noise, bypass capacitors and possibly resistors will be used when sending the accelerometer signals to the central unit.

## Subsystem 2 - Right Hand

The right subsystem will use one accelerometer to determine the broad movement of the hand. This information will be used to determine how much of a vibrato there is in the output sound. This system will need the accelerometer, bypass capacitors (.1uF), and possibly some resistors if they are needed for the communication scheme used (SPI or I2C).

## Subsystem 3 - Central Unit

The central subsystem utilizes data from the gloves to determine and generate the correct audio. To do this, two microcontrollers from the STM32F3 series will be used. The left and right hand subunits will be connected to the central unit through cabling. One of the microcontrollers will receive information from the sensors on both gloves and use it to calculate the correct frequencies. The other microcontroller uses these frequencies to generate the actual audio. The use of two separate microcontrollers allows for the logic to take longer, accounting for slower human response time, while meeting needs for quicker audio updates. At the output, there will be a second order multiple feedback filter. This will get rid of any switching noise while also allowing us to set a gain. This will be done using an LM358 Op amp along with the necessary resistors and capacitors to generate the filter and gain. This output will then go to an audio jack that will go to a speaker. In addition, bypass capacitors, pull up resistors, pull down resistors, and the necessary programming circuits will be implemented on this board.

# Criterion For Success

The minimum viable product will consist of two wearable gloves and a central unit that will be connected together via cords. The user will be able to adjust three separate notes that will be played simultaneously using the left hand, and will be able to apply a sound effect using the right hand. The output audio should be able to be heard audibly from a speaker.

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