Universal Internet Interface 2004 Team Time for your check up Shari McNamara Jared Gillis Etana Elegbe Eric Pettersen Shamit Patel

The UII and You ► ► Take a step back in time and bring the doctor to your home   Physician has access to daily physical health via the internet   Medical advice on patients current health   Avoid pain staking checkups ► ► Get the latest in medical monitoring technology with just a push of a button   Simple push button directions to send data   Wireless communication allows for medical monitoring to be mobile   Universal communication on all home medical monitoring devices

Third Generation Senior Design ► Bring cutting edge technology to the old design ► Make overall design simpler and more efficient ► Standardized universal communication protocol between all devices ► Keep product user friendly and convenient for the physician and home owner

Final Design Decisions ► ► User Interface with the UII   Palm Pilot is the only interface display to the UII. It tells the UII who the user is and what information it is receiving from medical peripheral ► ► Database   MySQL ► ► UII Communication Protocol   Communication Protocol between medical devices and UII ► ► ZIGBEE as Interface Between the UII, Palm Pilot, and Medical Devices ► ► Translators   Implement protocol on Freescale development board   Front end utilizes ZIGBEE and back end implements RS-232 ► ► Operating System for UII   Linux

Winter Team Requirements ► ► User friendly and ease of data collection by user ► ► Zigbee Wireless communication ► ► Accurate information transfer throughout the system ► ► Low power wireless development board to convert medical information from peripherals to a form the UII can understand ► ► Capable of temporary data storage ► ► Wireless Communication between Scale and PC ► ► Standard code format for versatile applications ► ► Develop our own bio-medical device

Analysis of Wireless Communication

Challenges Zigbee wireless communication between scale and PC Palm Pilot interface with Zigbee Board Familiarity with Code Warrior IDE Faulty Software tests tools for development board Wireless transmission timing with hand shaking Biomedical Amplifier Effective signal filtration

Overview of System Architecture

Winter Team Architecture

Freescale Development Board ► Motorola HCS08 40-MHz CPU  8 bit microcontroller unit  HCS08 instruction set  Power saving modes ► 64Kbytes Memory  60Kbytes of Flash  4Kbytes of RAM ► High performance  50 nsec minimum instruction cycle down to 20MHz bus  125 nsec minimum instruction cycle down to 8MHz bus ► Communication  Front end ZIGBEE  Back end RS-232  8 Analog to Digital Pins ► Power  9 volt battery  9 Volt AC to DC converter

Freescale Zigbee Development Board Design

Scale ASCII Output ► Baud Rate 2400bps ► 7 Data Bits ► Even Parity

Serial Input Flow Chart

Main Loop Flow Chart

Transmit Flow Chart

Receive Flow Chart

Our very own medical monitoring device… “THE FIFITH ELEMENT” ABOUT the Fifth Element… A two-channel bio-potential amplifier Choice of ECG (electrocardiogram) and EMG (electromyogram) recordings. Use of non-invasive (surface) electrodes- placed at strategic points on user’s body. Monitor the electrical activity of the user’s heart during ventricular activation, and of skeletal muscles.

Some Important Considerations ► Small amplitude signals on the order of about mV…Amplification ► Unwanted signals/noise (60Hz noise from power mains, electrode-skin contact/movement etc.) ► Effective filtering will be needed for correct recording ► 1-100Hz (ECG) ► Hz (EMG) ► User and Circuit protection (from leakage currents, ESD etc)

Simplified Block Diagram

Main Components of the 5 th Element Right leg drive Electrostatic discharge (ESD) protection Pre-amplifier -> Initial amplification prior to filtering Amplifier block Power supply

Right Leg Drive ► User Protection from leakage currents ► Reference/Ground point ► Feedback loop minimizes effect of common- mode voltages

Electrostatic discharge (ESD) protection ► At the channel inputs ► Current limiter ► Prevents destructive voltages from passing through to the rest of the device. ► In addition, an isolation amplifier IC is placed with the power supply.

Amplifier block ► Consists of the Filters 2 identical High Pass filters and one Sallen-Key low pass filter -> Band pass of: 2 identical High Pass filters and one Sallen-Key low pass filter -> Band pass of:  1-100Hz (ECG)  Hz (EMG) 2 Notch Filters  60Hz noise  1 filter per channel  UAF42 Chips ► More signal amplification

Power Supply ► 12V Source  Directly powers UAF42 chips  Through DC-DC converter-> 5V ► 5V  Powers rest of circuitry  Used to derive a buffered 2V bias that prevents output from swinging negative.

~The Design~ ESD Protection circuit Pre- Amplifier Right Leg drive ECG Filters Notch Filter EMG Filters CH. 1 Input (electrodes)

2V Bias Voltage 5V output 12V input Voltage supply

Winter Accomplishments ► Build Bio-potential amplifier ► Implement code structure on Freescale development boards ► Interface Freescale development board with  PC  The Scale ► Make sure PC receives data from the Freescale development board attached to the scale ► Final design write up ► User manual for any work done so next quarter students will have a place to start from

Goals for the Spring ► Interface Freescale development board with:  Blood pressure monitor  ECG  Heart rate monitor  UII ► Install a web server on the UII so information can be accessed via Internet. ► Final design write up continued ► Finish the users manual so anyone can use the project

Thank you! ► Dr. Phillips, as our sponsor and advisor ► The Previous two teams ► Intel ► Freescale ► Metrowerks

Questions?

EXTRA’S

Analysis of Operating Systems Linux Windows CE Embedded

Analysis of Development Boards Ember evaluation kit $ 4, Freescale Development board $ for 2 boards X-Bow mpr2400 Development board $ for 1 board

ZIGBEE is the Answer ► Application focus  Monitoring and control ► Newest standard for short-medium range wireless communication (up to 100m) ► Ease of implementation on UII  RS-232 ZIGBEE module ► Multi-slave compatibility  Network size 2 64 ► 128 bit advanced data encryption standard ► Low power  Battery life 100 – 1000 days