1

Lakshmi Baddam

Oren Levy

Marc Smith

Marvin Howard

Georgia Institute of Technology

March 15, 2011

2

Project Overview

Workout motivation tool that will manipulate music

Motivate runner to reach target heart rate

Available to iOS mobile users

Purchased in App Store for $1.00

3

Design Goals

User friendly GUI

Heart rate detection using Polar heart rate monitor

Music manipulation

Instantaneous performance data

Previous workout summaries

4

Design Overview

AccelerometerHeart Rate

MonitorMusic Playlist

User-defined Variables

Music

beatRunner

GUI

5

User Input – Settings Screen

Select paired HRM

User defined variables used to calculate target heart rate and calories burned

Enable music algorithm

6

App Features

Cardio

Fat burning Cross training

Select from three workouts

Set workout times

Select a playlist

Main screens navigation buttons

7

Heart Rate Monitor (HRM)

Polar Wearlink+ Heart Rate Transmitter

Paired to iOS mobile device

Transmits heart rate via Bluetooth

Heart beats per minute displayed in GUI

Determine if user is in target heart rate zone

8

Heart Rate Detection Testing

• Unrecognizable packets in serial port terminal

• Experimenting with setup

parameters

9

Workouts and Target Heart Rate (THR) THR zone intensity

      

Workout Type THR Zone Intensity

Fat Burning 60% - 70%

Cardio 70% - 80%

Cross Training 80% - 85%

THR = (Maximum - Resting) * Intensity + Resting

10

Accelerometer

iOS mobile device’s 3-axis accelerometer

UI Accelerometer class in developer library

Receive x, y, z direction values from hardware

11

Accelerometer Testing

Display x, y, z direction values

Strong vs. weak force

Detect a step

Time Stretching Change tempo while preserving pitch

Slow down song: repeat samples

Speed up song: remove samples

Done in milliseconds range

Two algorithm classes: Time Domain – SOLA Frequency Domain – Phase Vocoder

12

SOLA Time Stretching Algorithm

Synchronous-Overlap-Add

Time Domain

Overlapping offset

Window Length

73.9 BPM 60 BPM13

14

Song Selection

Must have the BPM in the ID3 tag

Place in order of BPM

Select based on ± 20 % of desired BPM

Keep play count

14

15

Cost Analysis

Budget: $400

Estimated equipment cost Polar Wearlink+ Heart Rate Transmitter with Bluetooth – $79.95

Development cost $41.27/hour wage: $56,908

125,000 downloads expected at $1.00 per download

Total profit: $68,091

16

Current Status

Problems Controlling music playback speed

Reading heart rate monitor values using terminal

Progress Reading accelerometer data

Detecting the Bluetooth heart rate monitor

Choosing music from the iPod library

17

Future Work

Finish heart rate monitor coding by 3/28/2011

Finish GUI by 3/28/2011

Finish pedometer coding by 3/24/2011

Finish SOLA algorithm by 3/28/2011

Integrate all modules into a single working app by 4/6/2011

Finish testing and debugging by 4/14/2011

18

Did you know...

In 2010, there were 39.989 million iPhone sales

An annual study found that 49.6% of Americans workout at least 30 min, three times a week

A study conducted listening to music boosts weight loss and helps people work out regularly

A study concluded that people who jogged while listening to music covered 24% percent more distance than joggers who did not listen to music

18