Smart Dust

1
Smart Dust Example of an Important
New Wireless Sensor System

• Brainchild of Prof. Kris Pister, EECS, UC
  Berkeley
• Small devices that can collect information from
  on-board sensors and transmit it over a wireless
  network that automatically sets itself up
• Possible sensors include temperature, relative
  humidity, illumination, acceleration, magnetic
  field, pressure, chemical vapors, camera,
  microphone,
• These motes have memories, microprocessor,
  radio receiver and transmitter
• Commercially available

2
Background

• SmartDust ultimate size

Passive CCR
comm
.
MEMS/
polysilicon
Active beam steering laser
comm
.
MEMS/optical quality
polysilicon
Analog I/O, DSP, Control
COTS CMOS
Sensor
Power capacitor
MEMS/bulk, surface, ...
Multi
-
layer ceramic
Solar cell
CMOS or III
-
V
Thick film battery
Sol/gel V
O
2
5
1
-
2
mm
3
Power

• Battery can last up to 7 days for radio mote, and
  2 days for laser mote under full duty cycle (i.
  e., on all the time)
• Radio mote battery can last up to 2 years under
  1 power duty cycle
• Solar cell can be used outdoors to support
  continuous power on

4
Sensors

• Temperature
• Pressure
• Humidity
• Light Intensity
• Accelerometer
• Magnetometer

5
RF MacroMote rev4 / weC Mote

• Sleep mode power drain 1?W (1 microwatt 10-6
  watts) wake mode power drain 30 mW (milliwatts
  10-3 watts)
• Radio communication frequency 916.5 MHz (MHz
  megahertz 106 cycles per second) like your
  portable telephone
• 150KHz clock
• Serial connection 9600 bps (bits per second)

6
Applications FingerMote Smart Access,
TreeMote, Burrowing Bird Monitor, Weather
Station, Child Behavior Monitor, Smart
Wherehouse Chartless Hospital Instant LAN
7
Professor Locator