Project

# Title Team Members TA Documents Sponsor
17 Shower Music Controller
 Amar Patel
Shalin Joshi
Varnith Aleti
 Eric Tang design_document1.pdf
proposal1.pdf
# Shower Music Controller

Team Members:
- Shalin Joshi (shalinj2)
- Amar Patel (amarcp2)
- Varnith Aleti (valet3)

# Problem

People often like to listen to music when they are in the shower, but it is very inconvenient to control/play specific music with wet hands, foggy screens, and with devices that aren't waterproof. If the person wants to switch the song, it leads to issues of getting the phone wet, having to step out of the shower, or just being stuck with whatever song is being played.

# Solution

The solution is a waterproof device that can be stuck to a shower wall, which allows the user to play, pause, skip, and even search for their playlists/songs from Spotify. This device will act as a Bluetooth remote interface to connect to a phone companion app. The app will be able to call the Spotify API and communicate with the device in order to do each task. The device will include buttons for playback actions and D-Pad buttons to navigate the UI on a screen.

# Solution Components

## Subsystem 1 - Embedded UI (Screen + Buttons)

Displays different menus and music lists (search, my playlists, now playing) and captures user input by using physical buttons. The buttons will be different ones for playback controls (play, pause, skip, volume) and a d-pad to navigate through the menus and songs on the UI. D-pad implemented using 4 tactile switches (UP/DOWN/LEFT/RIGHT) arranged in a cross layout plus a center SELECT switch, all mounted on the PCB and covered through a waterproof silicone membrane.

Components:
- SPI TFT display module using ILI9341 controller
- Tactile Switches

## Subsystem 2 - Microcontroller + BLE Communication

Runs the software for the button controls and has Bluetooth communication with the phone. Sends commands (play/pause, search query, select track) and receives results/status updates from the phone.

Components:
- ESP32 Microcontroller

## Subsystem 3 - Phone Companion App + Spotify Integration

Handles Spotify authentication and all Web API requests. Translates Bluetooth messages from the device into Spotify actions and returns data back to the device. The app will do all the music control and Spotify connections and communicate with the device in order to know which actions to perform

Components:
- Mobile app using Swift or React
- Spotify WebAPI

## Subsystem 4 - Power, Charging, and Water-resistant Enclosure

Provides safe portable power, charging, voltage regulation, and physical waterproofing suitable for shower spray/steam. This subsystem will ensure that the device and its components are water-resistant and have charging capabilities. We will make sure that water doesn’t harm our device by enclosing it in a 3D-printed enclosure. The screen will be covered by a clear acrylic/polycarbonate display window, and the buttons will be lined with a silicone membrane. When the user wants to charge the device, they will remove it from the enclosure and shower and charge it elsewhere.

Components:
- LiPo Battery
- Li-ion charger IC/module (USB powered charging)
- 3.3V regulator for MCU and display
- Waterproof enclosure elements
- 3D printed enclosure for the device board and circuitry
- Clear acrylic/polycarbonate display window
- Silicone membrane for buttons

# Criterion For Success
- From the shower device, the user can successfully perform different playback actions with a maximum 1-2 seconds of delay: Play/Pause, Next Track, Previous Track, Volume Up/Down
- Users can enter a search query using buttons, submit it, receive at least 5 search results on the device screen, select one, and start playback.
- Device can connect through bluetooth to phone companion app and remain connected through the entire duration of a shower
- Device remains functional after 5 minutes of exposure to shower spray/steam.
- Device operates for at least 2 hours of active use on a full charge.

Electronic Mouse (Cat Toy)

Jack Casey, Chuangy Zhang, Yingyu Zhang

Electronic Mouse (Cat Toy)

Featured Project

# Electronic Mouse (Cat Toy)

# Team Members:

- Yingyu Zhang (yzhan290)

- Chuangy Zhang (czhan30)

- Jack (John) Casey (jpcasey2)

# Problem Components:

Keeping up with the high energy drive of some cats can often be overwhelming for owners who often choose these pets because of their low maintenance compared to other animals. There is an increasing number of cats being used for service and emotional support animals, and with this, there is a need for an interactive cat toy with greater accessibility.

1. Get cats the enrichment they need

1. Get cats to chase the “mouse” around

1. Get cats fascinated by the “mouse”

1. Keep cats busy

1. Fulfill the need for cats’ hunting behaviors

1. Interactive fun between the cat and cat owner

1. Solve the shortcomings of electronic-remote-control-mouses that are out in the market

## Comparison with existing products

- Hexbug Mouse Robotic Cat Toy: Battery endurance is very low; For hard floors only

- GiGwi Interactive Cat Toy Mouse: Does not work on the carpet; Not sensitive to cat touch; Battery endurance is very low; Can't control remotely

# Solution

A remote-controlled cat toy is a solution that allows more cat owners to get interactive playtime with their pets. With our design, there will be no need to get low to the ground to adjust it often as it will go over most floor surfaces and in any direction with help from a strong motor and servos that won’t break from wall or cat impact. To prevent damage to household objects it will have IR sensors and accelerometers for use in self-driving modes. The toy will be run and powered by a Bluetooth microcontroller and a strong rechargeable battery to ensure playtime for hours.

## Subsystem 1 - Infrared(IR) Sensors & Accelerometer sensor

- IR sensors work with radar technology and they both emit and receive Infrared radiation. This kind of sensor has been used widely to detect nearby objects. We will use the IR sensors to detect if the mouse is surrounded by any obstacles.

- An accelerometer sensor measures the acceleration of any object in its rest frame. This kind of sensor has been used widely to capture the intensity of physical activities. We will use this sensor to detect if cats are playing with the mouse.

## Subsystem 2 - Microcontroller(ESP32)

- ESP32 is a dual-core microcontroller with integrated Wi-Fi and Bluetooth. This MCU has 520 KB of SRAM, 34 programmable GPIOs, 802.11 Wi-Fi, Bluetooth v4.2, and much more. This powerful microcontroller enables us to develop more powerful software and hardware and provides a lot of flexibility compared to ATMegaxxx.

Components(TBD):

- Product: [https://www.digikey.com/en/products/detail/espressif-systems/ESP32-WROOM-32/8544298](url)

- Datasheet: [http://esp32.net](url)

## Subsystem 3 - App

- We will develop an App that can remotely control the mouse.

1. Control the mouse to either move forward, backward, left, or right.

1. Turn on / off / flashing the LED eyes of the mouse

1. keep the cat owner informed about the battery level of the mouse

1. Change “modes”: (a). keep running randomly without stopping; (b). the cat activates the mouse; (c). runs in cycles(runs, stops, runs, stops…) intermittently (mouse hesitates to get cat’s curiosity up); (d). Turn OFF (completely)

## Subsystem 4 - Motors and Servo

- To enable maneuverability in all directions, we are planning to use 1 servo and 2 motors to drive the robotic mouse. The servo is used to control the direction of the mouse. Wheels will be directly mounted onto motors via hubs.

Components(TBD):

- Metal Gear Motors: [https://www.adafruit.com/product/3802](url)

- L9110H H-Bridge Motor Driver: [https://www.adafruit.com/product/4489](url)

## Subsystem 5 - Power Management

- We are planning to use a high capacity (5 Ah - 10 Ah), 3.7 volts lithium polymer battery to enable the long-last usage of the robotic mouse. Also, we are using the USB lithium polymer ion charging circuit to charge the battery.

Components(TBD):

- Lithium Polymer Ion Battery: [https://www.adafruit.com/product/5035](url)

- USB Lithium Polymer Ion Charger: [https://www.adafruit.com/product/259](url)

# Criterion for Success

1. Can go on tile, wood, AND carpet and alternate

1. Has a charge that lasts more than 10 min

1. Is maneuverable in all directions(not just forward and backward)

1. Can be controlled via remote (App)

1. Has a “cat-attractor”(feathers, string, ribbon, inner catnip, etc.) either attached to it or drags it behind (attractive appearance for cats)

1. Retains signal for at least 15 ft away

1. Eyes flash

1. Goes dormant when caught/touched by the cats (or when it bumps into something), reactivates (and changes direction) after a certain amount of time

1. all the “modes” worked as intended

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