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University of MinhoSchool of EngineeringDep. Industrial Electronics
A Bluetooth-based Wireless Distributed
Data Acquisition and Control System(1)Ezequiel Coelho, (1)Paulo Carvalhal, (1)Manuel Ferreira, (2)Luís Silva, (2)Heitor Almeida, (1)Cristina Santos and (1)José Afonso
(1)Department of Industrial Electronics(2)Department of Mechanical Engineering University of Minho, Guimarães, Portugal
http://aiva.dei.uminho.pt
University of MinhoSchool of EngineeringDep. Industrial Electronics
motorflaps flaps
ailerons ailerons
rudder
elevator elevator
GPSIMU
attitude
motor
Conventional Cable Approach
•High computational power•Functional & requirement upgrades are difficult
•High volume cabling & potential cabling problems•Complex electronics
University of MinhoSchool of EngineeringDep. Industrial Electronics
Snapshot
motor motorflaps
flapsailerons ailerons
rudder
elevador elevador
GPSIMU
attitude
•Easy upgrades•Simpler electronics•High modularity
•Cable elimination•Flexible architecture
University of MinhoSchool of EngineeringDep. Industrial Electronics
Global aircraft architectureon board instrumentation
GPS Inertial Measurement Unit 6 point aero-dynamical probe
Wind speed, α β angles, altitude, barometric pressure Radio Altimeter (automatic landing system) Temperature (Onboard electronic modules) Servo Actuators
2 Flaps 2 Ailerons 2 Elevators 2 Rudders
2 Electric Motors for aircraft propulsion
University of MinhoSchool of EngineeringDep. Industrial Electronics
Global system architecture on board architecture
BluetoothPiconet
master
EVS
Producer/Consumer
Producer/Consumer
Earth Station
Bidirectional Ground Station Communications
Link
DataLogger&
EarthLink
Flight Controller
Local multi-access Interconnect
University of MinhoSchool of EngineeringDep. Industrial Electronics
Global system architectureCommunications model
Physical platform
AIVA application
Transport services
Flight Controller
Ground LinkGround Link
Physical platform
AIVA application
Transport services Telemetry
Monitor Simulator
Local network communications
Ground Station
Bluetooth Network
MasterSlave(s)
Layered architectureFlexible projectReduce maintenance and future upgrades
University of MinhoSchool of EngineeringDep. Industrial Electronics
Global system architectureVirtual machine advantage
Master
Slave 7
Slave 6
Slave 5
Slave 4
Slave 3
Slave 2
Slave 1
Bluetooth stack interaction at application levelBluetooth complexity details can be ignoredBetter function integrationDesigner focus is on wireless application only
point-multipoint approach(Wireless MultiDrop)
Performance is affectedLimited functionality
University of MinhoSchool of EngineeringDep. Industrial Electronics
Global system architecture Experimental results
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Sampling Rate (Hz)
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Sampling Rate (Hz)P
acke
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oss
Rat
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•Experimental setup: 6 slaves, uplink constant bit rate traffic, 15 byte packets, balanced mode.•The developed system is able to reach a sampling rate of 200 Hz for all slaves simultaneously without performance degradation.
University of MinhoSchool of EngineeringDep. Industrial Electronics
Global system architecture Experimental resuslts
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Sampling Rate (Hz)
Del
ay (
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Mean Minumum Maximum Std. Dev.
•The delay is not adversely affected by a rise in the offered load, as long as the network operates below the saturation point.•The mean delay is around 27 ms.•The delay is lower than 90 ms for 99% of the samples.
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Delay X (ms)
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bab
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