Group #44

PROJECT: SURFING MITTENS

Members:Dhananja JayalathRyan MannNeil OlijChris Wiebe

Consultant:Dr. Hiren Patel

OUTLINE

• Introduction

• Problem

• Solution

• Risks And Mitigation

• Block Diagram Implementation plan and details

• Questions

PROBLEM

• Inexperienced gym members often perform exercises incorrectly• Unproductive• Leads to injury

• Experienced gym members have trouble maintaining a balanced workout schedule• Paper and pencil is impractical• Easy to lose track

• Personal training is expensive

SOLUTION

• EMG sensors integrated into workout clothing

• Detects muscle activation

• Displays real-time activation data to user

• Logs exercise repetitions over time

• Advantages:

• Unobtrusive

• Affordable

• Intuitive

RISKS AND MITIGATION

• Noise and interference – must reject common mode

• Contact motion

• ECG interference

• AC coupling

• Involuntary or unforced muscle activation – use calibration

• Physical integration of sensors into suit – use flexible PCB

Rectification

Differential Electrode

Instrumentation Amplifier

Microcontroller

ADC

GPIO

Processing

BlueTooth® Module

.

.

.

Sensors

Data Display Unit

Data TX and User Interface

Instrumentation Amplifier

Integration20-500 Hz Band-pass

filter

Rectification Integration20-500 Hz Band-pass

filter

Differential Electrode

SIGNAL ACQUISITION• Differential dry-electrodes

• Instrumentation (differential) amplifier

• Band-pass filter (20 – 500 Hz) with 40 dB/dec roll-off

• Rectifier

• Integrator – low pass envelope

Amplified/Filtered

Gerdle, B., Karlsson S., Day, S., Djupsjobacka, M. Analysis of the Surface Electromyogram. Modern Techniques in Neuroscience. Chapter 26, 732

Rectified/Envelope

PROOF OF CONCEPT

• Analog multiplexing

• Analog to Digital Conversion (ADC)

• STM32 ARM Cortex A3 Microcontroller

• Bluetooth module

DATA AGGREGATION & PROCESSING

USER INTERFACE• Custom Android application

• User-defined rep objectives

• Real-time data visualization

• Updated rep counting

• Reviewable rep history

QUESTIONS?