smart dust - university of california, berkeleypister/presentations/...smart dust engineering...
TRANSCRIPT
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SMART DUST
SMART DUSTEngineering systems in a cubic millimeter and beyond
Kris PisterBerkeley Sensor & Actuator Center
Electrical Engineering & Computer SciencesUC Berkeley – [email protected]
(on leave to start Dust Inc – [email protected])
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SMART DUST
Outline
• Brief History• “COTS” Dust• Optical Communication• Miniaturization• Mobility
Interdisciplinary Research• Engineering: Electrical, Mechanical, Chemical, Aerospace• Computer Sciences• Chemistry, Physics• Biology and Bioengineering• Nanotechnology
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SMART DUST
Ken Wise, U. Michigan
http://www.eecs.umich.edu/~wise/Research/Overview/wise_research.pdf
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SMART DUST
Bill Kaiser, UCLA
• http://www.janet.ucla.edu/WINS
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SMART DUST
Wireless dawn sensor
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SMART DUST
Computation
Difference EngineCharles Babbage, 1822
Steve Smith, UCB
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SMART DUST
Multi-hop message passing
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SMART DUST
Lots of exponentials
• Digital circuits• Speed, memory• Size, power, cost
• Communication circuits• Range, data rate• Size, power, cost
• MEMS Sensors• Measurands, sensitivity• Size, power, cost
CommunicationComputation
Sensing
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SMART DUST
Smart Dust Goal
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SMART DUST
COTS Dust - RF Motes
• Simple computer• Cordless phone radio• Up to 2 year battery life
N
S
EW 2 Axis MagneticSensor
2 AxisAccelerometer
Light IntensitySensor
Humidity Sensor
Pressure Sensor
Temperature Sensor
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SMART DUST
Open Experimental Platform toCatalyze a Community
Small microcontroller
- 8 kb code, 512 B data
Simple, low-power radio
- 10 kb
EEPROM storage (32 KB)
Simple sensors
WeC 99“Smart Rock” Mica 02
NEST open exp. platform
128 KB code, 4 KB data
50 KB radio
512 KB Flash
comm accelerators
Dot 01
Demonstratescale
Rene 00
Designed forexperimentation
-sensor boards
-power boards
TinyOS
Networking
Services
David Culler, UCB
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SMART DUST
TinyOS/COTS-Dust Platform Users
• INTEL CORPORATION• INTEL RESEARCH• JPL• KENT STATE UNIVERSITY• LAWRENCE BERKELEY NAT'L• LLNL• LOS ALAMOS NATIONAL LAB• MARYLAND PROCUREMENT• MIT• MITRE CORP.• MSE TECH. APPLICATION INC• NASA LANGLEY RESEARCH CTR• NAT'L INST OF STD & TECH• NICK OLIVAS LOS ALAMOS NA• NORTH DAKOTA STATE UNIV• PENNSYLVANIA STATE UNIV• ROBERT BOSCH CORP.• RUIZ-SANDOVAL, M.E.• RUTGERS STATE UNIVERSITY• SANDIA NATIONAL LABS• SIEMENS BUILDING TECH INC• SILICON SENSING SYSTEMS• SOUTHWEST RESEARCH• TEMPLE UNIVERSITY
• ACCENTURE• ALLEN, ANTHONY• ALTARUM• BAE SYSTEMS CONTROLS• BALBOA INSTRUMENTS• BOSCH• BUDNICK, LARRY• CARNEGIE MELLON UNIV• CENTRID• CLEVELAND STATE UNIV• CORNELL UNIVERSITY• DARTMOUTH COLLEGE• DOBLE ENGINEERING
COMPANY• DUKE UNIVERSITY• FRANCE TELECOM R&D• GE KAYE INSTRUMENTS, INC• GEORGE WASHINGTON UNIV.• GEORGIA TECH RESEARCH INT• GE• GRAVITON, INC• HRL ABORATORIES
• UNIV SOUTHERN CALIFORNIA• UNIVERSITY OF CALIFORNIA• UNIVERSITY OF CINCINNATI• UNIVERSITY OF COLORADO• UNIVERSITY OF ILLINOIS• UNIVERSITY OF IOWA• UNIVERSITY OF KANSAS• UNIVERSITY OF MICHIGAN• UNIVERSITY OF NOTRE DAME• UNIVERSITY OF SOUTHERN CA• UNIVERSITY OF TEXAS• UNIVERSITY OF UTAH• UNIVERSITY OF VIRGINIA• US ARMY CECOM• USC INFORMATION SCIENCES• VANDERBILT UNIVERSITY• VIGILANZ SYSTEMS• VITRONICS INC• WASHINGTON UNIVERSITY• WAYNE STATE UNIVERSITY• WILLOW TECHNOLOGIES LTD• WJM, INC• XEROX
30 Universities8 Govt./National Labs
68 Total
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SMART DUST
800 node demo at Intel Developers Forum
4 sensors$70,000 / 1000Concept to demo in 30 days!
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SMART DUST
Structural performance due to multi-directional ground motions (Glaser & CalTech)
.
Wiring for traditional structural instrumentation+ truckload of equipment
Mote infrastructure1
5
1
3
1
46
5
`
1
5
1
18
Mote Layout
129
Comparison of Results
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SMART DUST
Cory Energy Monitoring/MgmtSystem
• 50 nodes on 4th floor• 5 level ad hoc net• 30 sec sampling• 250K samples to database over 6 weeks
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SMART DUST
29 Palms Sensorweb Experiment
• Goals• Deploy a sensor network onto a road from an unmanned
aerial vehicle (UAV)• Detect and track vehicles passing through the network• Transfer vehicle track information from the ground network
to the UAV• Transfer vehicle track information from the UAV to an
observer at the base camp.
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SMART DUST
Flight Data
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SMART DUST
Dragon WagonFrom UAV
Dragon Wagon
HMMWVFrom UAV
HMMWV
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SMART DUST
Last 2 of 6 motes are droppedfrom UAV
• 8 packaged motes loadedon plane
� Last 2 of six being dropped
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SMART DUST
Detection algorithm
bAx
t
t
t
t
t
v
p
p
p
p
=→
=
4
3
2
1
4
3
2
1
/1
1
1
1
1
δ
Each vehicle V(v,δt) has two parameters:1) Speed (v)2) Time at beginning of network (δt)
The n-node network is described by an n-entry pattern vector p:The jth entry is the time we expect that node j will see V(1,0)
Times when nodes detect V are collected in the t vector
Linear least-squares guess at v and δt
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SMART DUST
Room to spare!
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SMART DUST
Volcano UAV
• Fully autonomous• 14’ wingspan• 30-90 mph, 50 mph cruise• 25 lb airframe, 75+ takeoff weight
• 5000 km range, no payload• 1000 km = 100 motes (today)
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SMART DUST
Bald Camel
• 50 motes• Microphone• Magnetometer• Micro-impulse radar
• 2 satellite phones• Deployed from a Predator
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SMART DUST
Available Sensors
• Demonstrated w/ COTS Dust• Temperature, light, humidity, pressure, air flow• Acceleration, vibration, tilt, rotation• Sound• GPS• Gases (CO, CO2)• Passive Infra-red• Contact/touch
• Available• Images, low-res video• Gases (VOCs, Organophosphates, NOx…)• Neutrons
Demonstrated Actuators• Motor controllers• 110 VAC relays• Audio speaker• RS232: LCD, …
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SMART DUST
Optical Communication
• SALT – steered agile laser transceiver• Dust
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SMART DUST
Video Semaphore Decoding
Diverged beam @ 5.2 km
In shadow in evening sun
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SMART DUST
~8mm3 laser scanner
Two 4-bit mechanical DACscontrol mirror scan angles.
~6 degrees azimuth, 3 elevation
1Mbps
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SMART DUST
CMOS Imaging Detector
Photosensor
Signal ProcessingA/D Conversion
SIPO ShiftRegister
CRC CheckLocal Bus Driver
Off ChipBus Driver
Pixel Array
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SMART DUST
Goal 1:1 Mbps, 5 km, 1 cm3
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SMART DUST
Goal 2: 1Mbps, 5km between UAVs
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SMART DUST
Optical Limits: ExamplesPixelArray
ReceiverFOV
ReceiverAperture
TransmitterHWHM
LinkRangeBit Rate
8 ×××× 890 °°°°10 mm5 °°°°10 m100 Mbps
16 ×××× 165 °°°°20 cm0.2 mrad500 km1 Mbps
8 × 810 °10 mm1 mrad5 km1 Mbps
Common Parameters:
Ptrans = 5 mW (opt.) Optical SNR > 20 dB Recv’d Power > -54 dBmλ = 830 nm ∆λ = 10 nm Rphoto = 0.25 A/W
MAV/MAV
Sensor/LEO
office
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SMART DUST
Looking East from Berkeley Marina
~1 steradian
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SMART DUST
+/- 10 degrees
Cory Evans Campanile
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SMART DUST
5.1 km link test
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SMART DUST
Data from 5.1 km link
• 15mW, 1mrad, 1Mbps TX• 2cm RX aperture• 40nW optical power received• Low link availability due to turbulence
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SMART DUST
Smart Dust Electronics
13 state
FSMcontroller
ADC100kS/s2uW
ambient lightsensor
Photodiode
Sensor input
Oscillator
Power input PowerTX Drivers0-100kbpsCCR or diode
Optical Receiver1 Mbps, 11uW
1mm
330µ
m
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SMART DUST
Isolation trenches are etched throughan SOI wafer and backfilled with nitrideand undoped polysilicon.
Smart Dust MEMS
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SMART DUST
Power, sensor, motor fab
Solar cells and circuits are createdby ion implantation, drive-in, oxidation,contact etching, aluminum sputteringand etching.
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SMART DUST
Actuators are deep reactive ion etchedthrough device layer.
Power, sensor, motor fab
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SMART DUST
Optional backside etch (would actually precede front side etch)
Power, sensor, motor fab
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SMART DUST
Solar Cell Results
Solar Array Performance
-0.4
-0.3
-0.2
-0.1
0.0
0.1
0.2
0 5 10 15 20 25 30
Voltage (V)
Cu
rren
t(u
A)
0.5 to 100 V demonstrated10-14% efficiency
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SMART DUST
Closing in on 1mm3
2.8mm2.
1mm CCR
Accelerometer
Solar Cells
CMOS IC
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SMART DUST
Smart Dust - Integration
Solar Cell Array CCR
XL
CMOSIC
16 mm3 total circumscribed volume~4.8 mm3 total displaced volume
SENSORS ADC FSMRECEIVER
TRANSMITTER
SOLAR POWER1V 1V 1V 2V3-8V
PHOTO 8-bits
375 kbps
175 bps
1-2V
OPTICAL IN
OPTICAL OUT
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SMART DUST
Mote with Micro-battery from Lee & Lin, UCB
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SMART DUST
~2 mm^2 ASIC
RF mote
• CMOS ASIC• 8 bit microcontroller• Custom interface circuits
• External components
uP SRAM
RadioADC
Temp
Ampinductor
crystal
battery
antenna
~$1
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SMART DUST
First Prototype Layout
• IO Pads• RAM blocks• MMU logic• Debug logic• ADC• CPU Core• RF Place Holder
2mm
Fabbed, functional
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SMART DUST
Second Prototype
8 bit uP, 3kB RAM8 bit ADCData encryption900 MHz RF TX
Talking to Blue moteat 19.2kbps, 10m
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SMART DUST
Working mote, happy grad student
Jason Hill
Jason’s mote
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SMART DUST
Power and Energy
• Sources• Solar cells ~0.1mW/mm2, ~1J/day/mm2
• Combustion/Thermopiles
• Storage• Batteries ~1 J/mm3
• Capacitors ~0.01 J/mm3
• Usage• Digital computation: nJ/instruction• Analog circuitry: nJ/sample• Communication: nJ/bit
10 pJ20 pJ/sample
11 pJ RX, 2pJ TX (optical)
10 nJ/bit RF
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SMART DUST
Energy and Lifetime
• 1 mAh ~= 1 micro*Amp*month (µµµµAm)• Lithium coin cell: 220 µµµµAm (CR2032, $0.16)
• AA alkaline ~ 2000 µµµµAm
• 100kS/s sensor acquisition: 2µµµµA• 1 MIPS custom processor: 10µµµµA• 100 kbps, 10-50 m radio: 300µµµµA
• 1 month to 1 year at 100% duty• 10 year lifetime w/ coin cell � 1% duty
• Sample, think, listen, talk, forward…2 times/second!
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SMART DUST
Mike Sailor’s Smart Dust
M. SailorUCSD Chemistry
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SMART DUST
Integrated Microwatt Transceiver,Howe/Rabaey, UCB
fclock
Rejects non-linear LNA componentsShapes LNA thermal noiseSelects System Frequency Bands
Prefilter: micro-machined LC passive
RF Filter(Low Q)
A
DLNA
NM Filter
NM Filter
NM Filter
•Radios need filters•The best filters are electromechanical•Power is related to size
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SMART DUST
Nano Dust?
• Nanotube sensors• Nanotube computation• Nanotube hydrogen storage• Nanomechanical filters for communication!
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SMART DUST
Mobility
• Walking• Hopping• Flying
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SMART DUST
Mobility
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SMART DUST
Power from MEMS CombustionPower from MEMS Combustion
Thermopiles
Nozzle(w/ igniter)
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SMART DUST
Milli-Millennium Falcon
Increase the thrust andIncrease the thrust anddecrease the mass,decrease the mass,while controllingwhile controllingthermal lossesthermal losses
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SMART DUST
Thrust Measurements vs. Theory
0
5
10
15
20
25
0 0.5 1 1.5 2 2.5
Time (sec)
Th
rus
t(m
illin
ew
ton
s)
Predicted altitude: 50 m
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SMART DUST
Rocket in Action
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SMART DUST
Synthetic Insects(Smart Dust with Legs)
Goal: Make silicon walk.
•Autonomous•Articulated•Size ~ 1-10 mm•Speed ~ 1mm/s
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SMART DUST
2 Degree of Freedom Legs
1st LinkMotor
2nd LinkMotor
1mm
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SMART DUST
Silicon Inchworm Motors
1mm
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SMART DUST
Current Layout for Motor and Legs
Legs
7.6 mm
Sola
rCel
ls
Motor
Motor
CM
OS
Linkages
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SMART DUST
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SMART DUST
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SMART DUST
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SMART DUST
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SMART DUST
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SMART DUST
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SMART DUST
Solar Powered Robot Pushups
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SMART DUST
Big Products from Small Workers
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SMART DUST
The Dark Side
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SMART DUST
Conclusion
• Tremendous promise• More new questions than answers