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Wi-Fi Interface for
medical devices
Academic Supervisor- Prof.Karen Reynolds
Industrial 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)
Client
host
Testing of Evaluation Board
Testing of Evaluation Board
My Project
PROTOTYPE
Computer with simple
terminal
Block Diagram
+
SPI
Battery
oscillator
Flinders
Biomedical
Built sensors
Eg-temperature,
ECG
ADC
Gain Span
GS1011M
(slave)
PIC18F13K22
Master
Adhoc
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
Continue- Specifications
 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
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=?
AT+NSUDP=10;
Set the IP address
of wireless
connection to the
same subset mask
AT+WA=IBSS ;
Set the IBSS,
note the
SSID used
Flow chart for Sending Data
Command
Processing
Esc U
Read
CID
NO
Valid?
Yes
Input Sensors
Read
Characters
Esc C
Transmit
Data
SPI
SPI – used as communication protocol
start
Set up variables
Configure SPI
Load SSPBUF
With Data to send
Check if SPI transfer
complete
NO
Did the SPI transfer YES
Complete
Increment counter
&
Wait
Read & Clear
Data in SSPBUF
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