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Biomedical Wireless Sensors to Biomedical Wireless Sensors to Control a Spinal Slope AngleControl a Spinal Slope Angle
Alina TurokAlina Turok1
BackgroundHealth and Rehabilitation Research Institute at North Shore campus holds experiments in order to learn to control bending and prevent harm.
Slide 2
Slide 3
An average person bends a lot of times during the day: exercising, picking up fallen objects, working.
Background
For every person the point when the bending angle becomes harmful is different.
• Industry made Shimmer Sensors
Existing Sensors
• Project 2013 – Wired Sensors
Slide 4
Project Purpose
The aim of this project is to advance the
concept of wireless sensors:
convenient to use
stable data stream
accurate final output
Slide 5
Project Purpose
Slide 6
First Approach
soldering of the USB dongle + JTAG connector – ready to be programmed
second set of wired sensors to be developed
To embed radio modules into the existing devices and modernize the code in order to get wireless modules to talk to each other.
part of the code is missing – the concept is impossible to fulfill
Slide 7
Standard Bluetooth,
IEEE 802.15.1
WiFi,
IEEE 802.11(a,b,g)
ZigBee (XBee-PRO),
IEEE 802.15.4
Transmission Range 10 meters 50-100 meters 60-3200 metersSignal Rate 723 kbps 11; 54 Mbps 250 kbpsNumber of Channels 79 14 (2,4 GHz) 16Channel Bandwidth 3 MHz 22 MHz 2 MHzOperating Frequency 2,4 GHz 2,4 and 5,8 GHz 868/915 MHz
2,4 GHzPower Consumption medium high very lowSleep Power 8 uW 10 uW 4 uWNumber of Nodes on Network 8 32 65000+
Network Topology Options star point to hub peer-to-peer, star, mesh
Latency up to 10 s up to 3 s up to 30 ms
Security 64, 128 bit encryption authentication Service Set ID (SSID), WEP
128 AES, application layer security
Stability low high HighComplexity of Implementation a bit complex complex very simple
Cost low high High
Wireless technologies’ comparison
Excellent
Poor
Satisfactory
Slide 8
XBee-PRO® ZB RF Module
Mesh network
Self-healing
SMT with PCB antenna
Up to 3200 m range
2.2 x 3.4 cm
Slide 9
Small, thin
Measurement mode 40uA
Standby mode
0.1uA
Digital data output
SPI
ADXL345
Slide 10
ZegBee Network Design
ZigBee network includes three items:
Coordinator (only one per network)
Routers
End Devices
All nodes can transmit and receive, but to be on one network each should have:
Unique PAN ID
Assigned channel
Slide 11
Final Product Design
Slide 12
The set of wireless modules is comprised of:
Two Sensors: XBee module + microcontroller + accelerometer + battery
XBee USB Dongle: XBee module + UART + USB connector
Block Diagrams
Slide 13
XBeeModule(Router)
MCADXL345
IC +
Crystall
JTAG
SPISPI UARTUART
Battery
UART USBXBee
Module(Coordinator)
:USB dongle
Sensors:
Modules Configuration
XBee® ZigBee SMT RF Module Development Kit
Multi-platform XCTU application Available for download from
Slide 14
Programmable Modules
XBeeModule
ADXL345
SPI
New block diagram with programmable XBee
XBee-PRO® ZB Programmable Development Kit
XBPP24CZ7PIS-004
XBee-PRO
Programmable Professional
NO SPI hardware coming out of the module
Slide 15
Prototype Development
Slide 16
Data from ADXL345 in a console window of ARDUINO
Final Testing
Slide 17
X, Y, Z coordinates highlighted
Data Packet From ADXL345
Slide 18
To display an output in decimal numeration to an application responsible for calculations (LabView).
Develop a final product on the basis of the prototype.
Another variation of networks with greater amount of end devices and routers to work in 3D dimension.
Next Steps
Slide 19