1. HITSMART Alphonso Carty - EE Patrick Shickel - CpE Daniel Padron - EE
Julien Missial - CpE
Julien
Group 3

2. MOTIVATION
During a typical training session, a boxer has no insight into their progress
Endurance, power, form, and calories burned are metrics of interest, yet not easily tracked
Tracking these statistics is vital to improving performance
Julien

3. GOALS AND OBJECTIVES
Accurately detect and record punch metrics using multiple sensing mechanisms
Observe session information instantly on a smartphone
Track progress over time in an intuitive and engaging way
Count, speed, and force
Calories burned, form metrics (tentative)
Offer a “competition” mode wherein two users compete [Nice to have :) ]
Julien

4. APPROACH AND IMPLEMENTATION
Small, lightweight, fingerless gloves
Fingerless gloves will have
Four force sensors over knuckles
Our custom PCB with accelerometer mounted around wrist area
Heart rate sensor touching wrist (tentative)
Allows portability (use system with any set of punching gloves)
Julien

5. SPECIFICATIONS AND REQUIREMENTS
System battery life of at least 2 hours of continuous operation (Avg power consumption = 70mAh)
Easily accessible batteries
System weight must not exceed 15% of the glove’s weight
Accurate sensor readings and calculations to within ± 5%
The system must not interfere with the normal fit and operation of the punching glove
The system must be capable of operating in a moist environment
Battery life a continuous operation of 2 hrs
we think this is reasonable for a training sessions
as well as user replaceable.
Total circuity weighing less than 15% of whole glove and
small enough to not interfere with the training
We are also aiming for a 5% tolerance in accuracy for our sensor
In addition it must be able to tolerate the sweaty environment of a hard session

6. SYSTEM BLOCK DIAGRAM
Neatly laid out diagram of our project. Project consists of our sensors which are then sent to the mobile app through the Bluetooth module

7. FORCE SENSOR We will be using the Flexiforce series of force sensors
These are thin, light and flexible
We will be using the Flexiforce A401 Sensor
Capable of forces up to 1000lb
Much more than the 200lb ranges we need for punch force detection
"Meeting the requirements of our specification size specification"
Property of Tekscan

8. FORCE SENSOR CALIBRATION
Sensors will be connected in the configuration as shown
Ideal for low-power, single source devices like HitSmart
Voltage is linear with applied force
Known weights will be placed on sensor and voltage reading will be plotted.
We must calibrate the sensors so that we have a sending range up to 300lb
Voltage reading range of 0 to 5V
the nice thing about tekskan sensors is that voltage reading is linear with force. (when set up in a single source mode as shown)
this makes is simple to calibrate. By placing known weights and plotting all the way linearly to 300b at 5V
Property of Tekscan

9. HEART RATE SENSOR (TENTATIVE)
Pulse rate reading will allow for more useful and accurate calorie calculations
Using the user’s body type information along with heart rate and exercise duration
Pulse reading will be taken from wrist where other circuitry is located to minimize extraneous cabling
User does not have to set up pulse sensor, only slip on the fingerless gloves
Cool thing about this is more accurate calorie burning statistics for the user.
In addition if we implement this sensor we would make sure it would not interfere with the training session. Data would we taken from wrist
Property of World Famous Electronics

10. PCB
Our Custom made PCB will sit on top the the previously mentioned Adafruit Bluetooth module as a “Shield”
This will be done for simplification of final assembly and cost reduction of electrical components.
Our PCB will incorporate:
ATtiny84 microprocessor
Accelerometer IC chip (ADXL377 based)
Boost converter module (TI TPS61090 based)
Easily accessible pinouts for connections to our various sensors
Pinouts for programming the MCU
Our PCB: basically everything but the Bluetooth module

11. ACCELEROMETER
Alphonso

12. ACCELEROMETER
We will be using a triple axis accelerometer (ADL377) as well as the force sensors with our product.
With this we can gather all information regarding velocity, impulse, motion changes, and even orientation.
The multiple axis readings from the accelerometer can also give us the data we will need to even detail the form of the user’s strikes (this is a tentative function).
Alphonso

13. ACCELEROMETER
Property of Analog Devices
Alphonso

14. POWER
Alphonso

15. POWER Lithium Metal coin cell batteries Battery output 250mAh
Part Per Glove
Estimated Current Draw Per Glove
ATtiny84 MCU
50mA
Force Sensor (x2)
1.5mA
Accelerometer
300 µA
Pulse monitor
4mA
Bluetooth LE
7-15mA
Estimated total current draw:
70mA
Images property of Sparkfun Electronics
Alphonso
2 hr continuous operation is satisfied

16. VOLTAGE REGULATOR AND BOOST CONVERTER
Our microcontroller and other electronics all revolve around 3.3 and 5 Volt inputs.
To satisfy this, we will use a boost converter to step up the voltage to 5V for the microcontroller’s inputs and a voltage regulator to regulate down to 3.3V for the accelerometer.
Alphonso

17. COMMUNICATIONS
Patrick

18. BLUETOOTH Bluefruit LE nRF8001 Shield for our PCB SPI interface
Range < 10 meters
Images property of Adafruit
Patrick

19. COMMUNICATIONS
Patrick

20. COMMUNICATIONS
Patrick

21. MCU
Patrick

22. MCU SOFTWARE
Patrick

23. MCU SOFTWARE
Patrick

24. MOBILE APPLICATION
Julien

25. DESIGN AND DEVELOPMENT DECISIONS
Why iOS?
More experience
We already have MacBooks, iPhones, and a Developer account
Better support (nRF)
> > (Lol)
Julien

26. DESIGN AND DEVELOPMENT DECISIONS
XCode, Objective C & Swift:
Xcode is the default IDE for native iOS Development
Created by Apple
Supports C, C++, Objective C, Objective C++, Java, AppleScript, Python, Ruby, etc...
Objective C and Swift are the main/only languages
Both created by Apple
Object-oriented (Objective C is the same level as C)
Julien

27. DESIGN AND DEVELOPMENT DECISIONS
Adafruit Bluefruit LE nRF8001 SDK/Framework
Simple documentation
Easy implementation

28. DESIGN AND DEVELOPMENT DECISIONS
Parse and Parse SDK:
MBaaS provider (Mobile Backend as a Service)
Acquired by Facebook in 2013
Parse SDK provides
Push Notifications
Social Network Integration
Cloud Storage
Easy step-by-step integration
Good documentation
We will be using Parse for logging in, and possible storage
Julien

29. CORE FEATURES Record a session Save a session Access old session data
Share online through social media
Challenge Mode (tentative)
Julien

30. CLASS DIAGRAM
Julien

31. GUIS
Drop-down Menu Start Session Running a Session
Julien

32. STANDARDS IEC60071 Insulation coordination IPC-2221
Generic standard on printed board design
IPC-6011
Generic performance specification for printed boards
IPC-2615
Printed circuit board dimensions and tolerances
IPC-D-325
Documentation requirements for printed circuit boards
Bluetooth Core Specification 4.2 / IEEE
Bluetooth communication protocol specification
SPI
Serial Peripheral Interface standard
I2C
Serial port communication standard
UL 4200A
Standard for Safety for Products Incorporating Button or Coin Cell Batteries of Lithium Technologies
IEC60478
Stabilized power supplies, DC output
Patrick

33. PROJECT SCHEDULE
Patrick

34. Force sensors and power
WORK DISTRIBUTION
Carty
Padron
Shickel
Missial
Mobile App Software
Secondary
Primary
Microcontroller
PCB and Accelerometer
Force sensors and power
Patrick

35. PROGRESS
Alphonso

36. PROTOTYPING BUDGET Part Cost Boxing Gloves $28 Force Sensor (x4) $8 ea
ADXL377 Accelerometer (x2)
$40 ea
ATTiny (x2) $5
Adafruit nRF8001 Bluetooth Module (x2)
$20 ea
Coin-cell Batteries (x8)
$2 ea
Boost Converter (x2)
$10 ea
Grand Total
$226

37. ISSUES / UNEXPLORED Connecting multiple bluetooth devices to app
Interpretation of data
Data coming in from the sensors must be interpreted to be useful in the real world
Weight and size of parts
Moisture level of environment
Alphonso

38. QUESTIONS?