# Title Team Members TA Documents Sponsor
37 Musicians' Essential Link for Optimized Digital Instrument Connection (MELODIC)
Colin Devenney
Macrae Wilson
Ryan Libiano
Koushik Udayachandran design_document1.pdf

Team Members:
- Colin Devenney (colinfd2)
- Ryan Libiano (libano2)
- Macrae Wilson (macraew2)

# Problem

A common problem associated with live performing is the rats nest of audio and control cables required to run front of house equipment, digital effects, and instruments, to name a few. However, in recent times UHF, VHF and ISM systems have taken mainstay in the industry to overcome this problem. For a large performance, a $10,000+ rack dedicated to wireless audio systems make sense. For the performing musician on a budget, such as a small house band or a coffee shop artist, current budget products (<$300) suffer from problems such as data packet collisions, limited audio quality, and lack features such as frequency hopping and diversity.

# Solution

A wireless system designed to connect two audio devices (keyboard to speaker, guitar to amp) using two MELODICs. The idea is a pair of devices using Texas Instruments’ CC8530 RF SOC’s as the microcontroller/host for peripheral devices, such as the CC2590 range extender and the TLV320AIC3204 audio codec. The main components of the system include a power subsystem using a 9V battery, an audio system (codec, control), and digital RF (CC8530, range extender). We will create two identical devices which can be used interchangeably (as master or slave).

# Solution Components

## Subsystem 1 - Power

9V battery with buck converter to account for 3.3V required for CC8530. Additionally, a linear regulator may need to be used to account for voltage rippling.

## Subsystem 2 - Audio

This includes the audio codec chip TLV320AIC3204 and buttons for controlling the power and pairing. Additionally, the TLV320AIC3204 chip communicates with the CC8530 through an I2C bidirectional bus for control processing and I2S for audio processing. The CC8530 also includes software from Texas Instruments which allows for easy programming. The TLV320AIC3204 allows for Line-in and Line-out ports for use with musical and audio devices. These will be connected to ¼ inch TRS jacks so the device can act as either a master or a slave depending on the programmed firmware.

## Subsystem 3 - Digital RF

RF processing is done through the CC8530 chip as well as the CC2590 range extender. These two chips will be coupled with a microstrip line, and associated circuitry for balancing and matching the antenna will be connected to an SMA port on the output of the CC2590 range extender. The CC8530 chip, which will manage all the peripherals over I2C and I2S digital communication protocols. The chip features a Cortex Arm-M3 Microcontroller and associated radio and audio co-processing hardware needed for the digital and analog RF front end. The chip also handles the clocking, framing and transmission of the wireless data packets as well as the clock, audio transmission and control for TLV320AIC3204 audio codec. Using Texas Instruments Configuration tool we can set the chip to autonomously run on its own, without need for control from an external master.

# Criterion For Success
-All buttons (for now, power and pairing) should work as intended.

-System should allow for monitoring power levels in each device (LEDs).

-Line-in line-out connection compatible with instruments.

-Coexistence with existing 2.4GHz protocols such as bluetooth and WLAN.

-Able to transmit lossless CD quality audio. Human-friendly enclosure with battery status LEDs and control buttons.


Srinija Kakumanu, Justin Naal, Danny Rymut

Featured Project

**Problem:** When working out at home, without a trainer, it’s hard to maintain good form. Working out without good form over time can lead to injury and strain.

**Solution:** A mat to use during at-home workouts that will give feedback on your form while you're performing a variety of bodyweight exercises (multiple pushup variations, squats, lunges,) by analyzing pressure distributions and placement.

**Solution Components:**

**Subsystem 1: Mat**

- This will be built using Velostat.

- The mat will receive pressure inputs from the user.

- Velostat is able to measure pressure because it is a piezoresistive material and the more it is compressed the lower the resistance becomes. By tracking pressure distribution it will be able to analyze certain aspects of the form and provide feedback.

- Additionally, it can assist in tracking reps for certain exercises.

- The mat would also use an ultrasonic range sensor. This would be used to track reps for exercises, such as pushups and squats, where the pressure placement on the mat may not change making it difficult for the pressure sensors to track.

- The mat will not be big enough to put both feet and hands on it. Instead when you are doing pushups you would just be putting your hands on it

**Subsystem 2: Power**

- Use a portable battery back to power the mat and data transmitter subsystems.

**Subsystem 3: Data transmitter**

- Information collected from the pressure sensors in the mat will be sent to the mobile app via Bluetooth. The data will be sent to the user’s phone so that we can help the user see if the exercise is being performed safely and correctly.

**Subsystem 4: Mobile App**

- When the user first gets the mat they will be asked to perform all the supported exercises and put it their height and weight in order to calibrate the mat.

- This is where the user would build their circuit of exercises and see feedback on their performance.

- How pressure will indicate good/bad form: in the case of squats, there would be two nonzero pressure readings and if the readings are not identical then we know the user is putting too much weight on one side. This indicates bad form. We will use similar comparisons for other moves

- The most important functions of this subsystem are to store the calibration data, give the user the ability to look at their performances, build out exercise circuits and set/get reminders to work out

**Criterion for Success**

- User Interface is clear and easy to use.

- Be able to accurately and consistently track the repetitions of each exercise.

- Sensors provide data that is detailed/accurate enough to create beneficial feedback for the user


- Designing a circuit using velostat will be challenging because there are limited resources available that provide instruction on how to use it.

- We must also design a custom PCB that is able to store the sensor readings and transmit the data to the phone.