Project

# Title Team Members TA Documents Sponsor
28 Portable Bluetooth Music Player
 Arpan Choudhury
Joseph Yang
Robert Conklin
 William Zhang design_document1.pdf
design_document3.pdf
design_document4.pdf
design_document5.pdf
final_paper1.pdf
other1.pdf
other2.pdf
proposal2.pdf
proposal1.pdf
# Portable Bluetooth Music Player

Arpan Choudhury arpanc2

Joseph Yang josephy2

Robert Conklin rmc2

## Problem :

Current music playback devices are increasing in size to meet the demand for larger and larger screen sizes. Along with this, the weight of these devices is rather large, as a result of using metals and glass to give users a 'premium feel,' and increasing battery size to maximize the charge life of the device. These factors combine to make good smart devices; however, they also lead to bulky/inconvenient device profiles for physical activity, especially activities like running.

## Solution Overview :

A clip-on wireless music player, capable of storing the user's music, and connecting to wireless headphones via Bluetooth while still still being lightweight and convenient to wear while exercising. The music player will use a Cortex-M series microcontroller to interface with a BLE module to communicate with the paired Bluetooth headset, read from flash memory to store and play back audio, and read user input from buttons on the device.
## Solution Components :

### MCU :

For this device, a versatile, low-power, and compact microcontroller is required, as the focus of the project is to design a lightweight, small profile music player. Due to the power-efficient design and low cost of the K32 L2 (K32L2B31VLH0A) MCU, this microcontroller appears to be the current best fit for the design, as it fits all the conditions listed above. Additionally, it has native USB 2.0 support hardware, simplifying the design process, and ensuring that the device will handle USB communication. Along with this, the K32 L2 has a sufficient amount of GPIO pins in addition to the required DMA and I2C connections to handle the flash memory and various peripherals, respectively.

### Bluetooth :

For connectivity to the Bluetooth headphones, a Bluetooth module is required to manage and handle the communication between the headphones and the MCU.

### Memory :

The music player should have enough space so that users can listen to music for the duration of an entire workout. We decided that 2 GB would be a reasonable size for this purpose (roughly 500 songs). While this may be less than the amount of space available on modern smartphones, we only need a few hours of storage capacity at max, and 2 GB is capable of holding significantly more than that.

### Interface :

To reduce weight, size, and cost of production, we decided to use a simple monochrome OLED display and button interface. We can limit pausing, playing, and track selection to to a single button, using double, or triple tapping to skip forward and skip backward respectively. Mapping these functions to the same button would simplify the design, allowing for less space to be used, while still having strong functionality. In addition, there would be power button, to turn on and off the device. Pairing the device could be accomplished using multiple held button presses,

### Battery :

We are planning on using a standard lithium-ion battery and charging system. This is due to the compact and high energy density of these systems, along with the variety of available systems.

### Display :

A small monochrome OLED display, interfacing with the MCU via I2C, allowing for pairing information to be displayed to the user when setting up the Bluetooth connection to a pair of wireless headphones.

## Criterion for Success :

A device capale of receiving and writing audio data to flash memory, and playing back audio from memory via a Bluetooth device. This includes meeting the memory/storage requirements in the design of the device, working user interface to control device, and having electronic components configured compactly enough to fit into a slim exterior profile.

Dynamic Legged Robot

Joseph Byrnes, Kanyon Edvall, Ahsan Qureshi

Featured Project

We plan to create a dynamic robot with one to two legs stabilized in one or two dimensions in order to demonstrate jumping and forward/backward walking. This project will demonstrate the feasibility of inexpensive walking robots and provide the starting point for a novel quadrupedal robot. We will write a hybrid position-force task space controller for each leg. We will use a modified version of the ODrive open source motor controller to control the torque of the joints. The joints will be driven with high torque off-the-shelf brushless DC motors. We will use high precision magnetic encoders such as the AS5048A to read the angles of each joint. The inverse dynamics calculations and system controller will run on a TI F28335 processor.

We feel that this project appropriately brings together knowledge from our previous coursework as well as our extracurricular, research, and professional experiences. It allows each one of us to apply our strengths to an exciting and novel project. We plan to use the legs, software, and simulation that we develop in this class to create a fully functional quadruped in the future and release our work so that others can build off of our project. This project will be very time intensive but we are very passionate about this project and confident that we are up for the challenge.

While dynamically stable quadrupeds exist— Boston Dynamics’ Spot mini, Unitree’s Laikago, Ghost Robotics’ Vision, etc— all of these robots use custom motors and/or proprietary control algorithms which are not conducive to the increase of legged robotics development. With a well documented affordable quadruped platform we believe more engineers will be motivated and able to contribute to development of legged robotics.

More specifics detailed here:

https://courses.engr.illinois.edu/ece445/pace/view-topic.asp?id=30338

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