Wi-Fi Interface for medical devices

Academic Supervisor- Prof.Karen ReynoldsIndustrial Supervisor- Mrs Jodie Hobbs

AIM-To send the physiological data wirelessly into the iPhone /iPad / computer with the help of Wi-Fi

FBE built sensors e.g. ECG, temperature

Why using Wi-Fi communication?

Four different ways to send data into iPod /iPad

By using 30 pin dock connector

Headphone jack

Bluetooth

Wi-Fi

Application

Evaluation Board( Serial2 Wi-Fi)

host

Client

Testing of Evaluation Board

Testing of Evaluation Board

My Project

Computer with simple terminal

PROTOTYPE

Block Diagram

+

PIC18F13K22Master

Gain Span GS1011M

(slave)

Battery

FlindersBiomedical

Built sensorsEg-temperature,

ECG

Adhoc

oscillator

ADC

SPI

Specification of Wi-Fi module(GS1011M)

Power- 3.3V (low power)

Processor -2.4GHz

Data Rate- 11,5,2,1Mbps

Standard= 802.11b/g/n

Interface-SPI (master/slave mode), UART ,ADC

Operation mode- Adhoc, infrastructure

Crystal oscillator-44 MHz XTAL

Compatible with any 8/16/32 microcontrollers

Power consumption-

Standby/Deep sleep- 7μA/150μA

Receive @ 11Mb/sec- 140mA

Transmit @11Mb/sec-150mA

Cost- $29.95 (US)

Availability

Continue- Specifications

Specifications of PIC18F13K22

Voltage – (max:5.5V,min:1.8V)

Clock frequency – 64MHz

Interface- SPI, I2C, EUSART

Flash Memory Size- 8KB

Cost- $6.87 (AUD)

At 3.3V , the oscillator can run 64 MHz Frequency between (-40 to 85 degree C)

Current = 15.4mA (Run Supply mode at 64 MHz Internal oscillator)

Setting an Adhoc Network

In an Adhoc network ,the stations are directly connect to each other.

AT+NDHCP=0;AT +NSET=?

Set the IP address of wireless

connection to the same subset mask Set the IBSS,

note the SSID used

AT+WA=IBSS ;AT+NSUDP=10;

Flow chart for Sending Data

Command Processing

ReadCID

Valid?

Read Characters

Transmit Data

Input SensorsSPI

NO

Yes

Esc U

Esc C

SPI – used as communication protocol

start

Set up variables

Configure SPI

Load SSPBUFWith Data to send

Check if SPI transfercomplete

Did the SPI transfer Complete

Read & Clear Data in SSPBUF

Increment counter&

Wait

NO YES

Conclusion

Low power and high- performance wireless data communication system will be designed with the help of low- power transceiver.

Allows medical parameters transmission

Accurate

Easy to use

Timely data to users

Any Questions ?

Thankyou