Remote Sensor Control

1
Remote Sensor Control Communication --Light
monitor and control subsystem

• ECE 445
• Yongpo Zhang
• 04/26/2007

2
Agenda

• Introduction of remote sensor network
• Project description
• Solution
• Sensor - Moteiv tmote Sky
• Design
• Advantage and disadvantage
• Demo

3
Sensor Network
4
Project Description

• Collection outdoor sunlight information
• Determine sunlight density
• Output signal to control equipment related to
  light

Data processing center
5
Project Description - characteristic

• MOTE should be cheap ? system should be designed
  reliable
• Data fluctuation
• Break down
• Large amount of sensor
• Low power

6
TMOTE Introduction

• Tmote Sky has connections for two photodiodes.
  Moteiv currently uses photodiodes from Hamamatsu
  Corporation
• Photo sensitivity vs. wavelength

7
Project Description-schematic
sensor
Road Lamp
Control signal
Light data
sensor
Data processing
Decision made
Receive data
Control signal
Light data
House equipment
Light data
sensor
Control signal
Base sensor
Light data
Other Equipment
sensor
8
Project Description Special cases

• Data fluctuation for each node
• Imprecise sense data produced by sensor
• Outside noise
• 10,10,10,10,10,40,10,10,10,10,
• Break down of certain node
• 40,40,40,40,40,40,40,40,40,40,
• 10,10,10,10,10,40,10,10,10,10,
• 40,40,40,40,40,40,40,40,40,40,
• 40,40,40,40,40,40,40,40,40,40,
• Long period interference for certain node
• 40,40,40,40,40,40,40,40,40,40,
• 10,10,10,10,10,40,10,10,10,10,
• 40,40,40,40,40,40,40,40,40,40,
• 40,40,40,40,40,40,40,40,40,40,

9
Solution-each light sense node
10
Solution processing data received from one
source node
Flag1
Threshold
Receive data
Moving window average
Flag0
11
Solution data processing control for all the
source node
Control signal
Final Decision
flag2
Node 2 data processing
Bright
Check nodeID
flag3
Node 3 data processing
Ambiguous
..
flagn
Node n data processing
Dark
12
Solution - Two level sense mechanism (proposal)

• Level_1 sense first
• Get decision ? done
• Ambiguous ?
• Base sensor broadcast request to sleep sensors
• sleep sensors is woken up
• sleep sensors send data
• Make decision again

Data processing center
13
Design Benefit

• Robust
• Noise immunization
• Fault tolerance/reliability for entire network
• Low power
• Scalability
• scale to a large number of sensor nodes
• intelligent management of high densities of nodes
• Topology
• Random or deliberate placement of nodes
• Sensor mobility
• Traffic patterns
• Event-driven applications
• Query-driven applications

14
Demo

• Blue ? bright red ? dark
• Demo cases
• All three sensor exposed in sunlight ? blue
• One of the sensor suffer dark for short term
  ?blue
• 1 of 3 sensor suffer dark ? blue
• 2 of 3 sensor suffer dark ? red

15
Thanks

• Any question?