Revisimo

Remote Vital Sign Monitor

TM

About us

Dr. Thomas Morris

Advisor

Cory Zywno

EE

•Coordinator•Thermo- Dynamics•Calibration

MatthewGalloway

EE

•Temperature Conversion•Thermo- Dynamics •Calibration

MatthewGallups

EE

•Alarm•Battery Life•SPI Interface

AaronCheeseman

EE

•User Interface•PCB design•Battery Life

PaulJang

CPE

•RFD•SPI Interface•User Interface

Overview

• Problem/Solution• Constraints

– Technical– Practical

• Testing– Hardware– Software– System

• Future Goals• Questions

Problem

• Market (oral, tympanic, scanning)– Inaccurate & No Programmable Alarm– Difficulty of Continuously Monitoring

• Hospital equipment– Expensive– Mobility is Restricted– Hard to use

Solution• What is Revisimo?

– Digital wireless Thermometer

• Bandage• Wireless• Temperature

Sensing Device• Monitor

• Alarm• Temperature set

by the user

System Overview

Constraints

Technical Constraints

Battery Life Revisimo must have a minimum battery life of seven days.

Wireless The bandage and monitor must communicate with

each other within a 100-foot radius (indoors). Alarm System The alarm must be triggered if a user defined

temperature is reached. Also, the alarm must be audible from at least 30 feet away.

Temperature Precision

Revisimo must calculate the core body temperature within 0.5 °F. Revisimo must read temperatures within the range of 65 °F to 110 °F.

Visual Distance The display must present data to the user at a distance of up to 3 feet.

Manufacturability

• The bandage must fit on the temple and the monitor must be handheld.

Political

• Revisimo must abide by Federal Communications Commission regulations and allocations of the radio spectrum (9kHz to 3THz).

Battery Life

• Current Draw (Low Power Mode): 5.1 mA

• Current Draw (Active Mode): 35.6 mA

• 4ms transfer time

• mA-h= 855.01+.27= 855.28 mA-h

• A coin cell battery of 900 mA-h to 1000 mA-h will be sufficient.

Hardware Testing

Operating Range

Description Displacement Pass/Fail

Case 1 Same Floor (Line of Site) 163 Feet Pass

Case 2Same Floor, 1 Hall (Non Line of Site) 152 Feet Pass

Case 3Same Floor, 2 Halls (Non Line of Site) 59 Feet Pass

Case 4 1 Floor up (Non Line of Site) 164 Feet Pass

Case 5 1 Floor up, 1 Hall (Non Line of Site) 115 Feet Fail

Case 6 2 Floors Down (Non Line of Site) 44 Feet Pass

Case 7 3 Floors Down (Non Line of Site) 31 Feet Fail

Alarm Audibility

• The alarm was tested for audibility from thirty feet away.

• The alarm operates at 245 Hz and approximately 3Vpp

Display Readability

• The monitor was setup three feet away from the user.

• The test concluded that the LCD could lucidly be seen from three feet away.

Software Testing

User Interface (UI)

Display

Display

Display

Temperature Calibration

Measured Voltage (V) Calculated Temp (F) IR Temp (F) Thermocouple Temp (F) Calculated/IR Average Constant

0.654 95.07 96.2 96 1.0118 1.0288

0.64 96.18 99.6 98 1.0355

0.605 99.31 102.3 102 1.0301

0.586 100.67 104.5 104 1.0380

Measured Voltage (V) Calculated Temp (F) IR Temp (F) Thermocouple Temp (F) Calculated/IR Average Constant

0.679 93.13 96 96 1.0308 1.0415

0.64 96.18 100.4 99 1.0438

0.623 97.56 101.8 102 1.0434

0.602 99.31 104.1 104 1.0482

Thermistor 1 Calibration

Thermistor 2 Calibration

sbss

bc TTTh

hT

Digital Thermometer (F) Skin Thermistor 1 (F) Skin Thermistor 2 (F) Buried Thermistor 1 (F) Calculated Core Body Temperature (F)

98.9 95.57 97.96 91.38 102.15

95.28 97.98 91.09 102.17

95.45 97.96 90.95 102.46

95.5 97.86 90.93 102.43

1399.s

b

h

h

Temperature Calibration

Thermal Conductivity of Bandage and Skin

Temperature Calibration

Digital Thermometer (F)

Calculated Core Body Temperature (F)

Temperature Difference (F)

98.4 96.1 2.3

97.4 1.0

96.2 2.2

96.0 2.4

95.8 2.6

IR Thermometer (F) Surface Temperature 1 (F) Surface Temperature 2 (F) Difference (F)

105.0 102.8 104.3 .7

102.5 103.9 1.1

102.8 103.9 1.1

102.9 103.9 1.1

Hot Plate Results

Temple Region Results

System Testing

System Tests

Sunny Day Case

Rainy Day Case

Future Plans

• Increase Temperature Accuracy• Control Layer PCB

– Antenna– Battery– Microcontroller

• Monitor PCB– Antenna– Battery– User Interface– Microcontroller

Questions

Reference

• [1]http://www.accesshealth.com.au/sample/107/122/Meas_Therm_Reister_Tympanic_250_x_489_1024.jpg

• [2]http://ec2.images-amazon.com/images/P/B00004C8SV.01._SS400_SCLZZZZZZZ_V1057215662_.jpg

• [3]http://ecx.images-amazon.com/images/I/312EW9VHJNL._SL500_AA280_.jpg

• [4]http://www.tmhfoundation.com/images/fundraisingobjectives_pic3.jpg

• [5]http://en.wikipedia.org/wiki/File:US-FCC-Seal.svg