Transcript Review_paper191

Wireless Sensor Network Research
and Application
In Agricultural Environment
Monitoring
Meng Hao
Gu Lichuan
Sun Fukang
School of Information and Computer of Anhui Agricultural University, Hefei, China
School of Computer of Anhui University of Architecture, Hefei,China
Instructor : Professor Frank Y.S. Lin
Presented by Ray J.P. Lo
Agenda
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Introduction
System Structure
Software
Conclusion
Introduction
Introduction
 Recently, many researches have been
involved in wireless sensor networks.
 To establish practical application systems,
there are many technological difficulties
needed to be solved, such as :
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Production cost of systems
Volume of sensors
Power support time
Network protocols
Introduction (cont’d)
 In the application of agricultural informatics,
there are wide application requirements in
data transmissions by using wireless
sensors.
 This research focus on the agricultural
environment data collection and application
by using 433MHz with one direction data
transmission wireless sensors.
System Structure
System Structure
 This research wants to use normal digital
elements with smaller volume to monitor
the environment in connected greenhouse
by wireless sensor network.
 They uses 433MHz ASK modulation radio
signal to transfer data from front sensors.
 The nodes uses the superheterodyne
receiver with the same frequency to gather
data and then transfer data to the upper
computer by GPRS.
 According to above, the whole system can
be used almost anywhere.
System Structure (Cont’d)
 The wireless sensor module is
consisted of :
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Low-power consumption MCU
Data acquisition circuit
Radio circuit
Power system
System Structure (Cont’d)
 The low-power MSP430F149, MSP series
MCU is 1.8v~ 3.6v working condition, and
the power consumption is decided by the
working mode.
 Five low power working modes can be selected.
 By controlling the pins working mode, the
batteries can be used for longer time.
 In terminal systems, MSP430 can complete
A/D, data saving, coding, and other control
work.
System Structure (Cont’d)
 Considering the environment monitoring
based on light, temperature, and soil
humidity in a greenhouse, they uses lightsensitive diode, temperature diode, and soil
humidity sensor to detect illumination
intensity, air temperature, and soil humidity,
respectively.
 All the signals can be connected to MSP430
MCU A/D pins.
 The data are converted and coded for
transferring to the nodes by the radio signal.
System Structure (Cont’d)
 They use the time sharing protocol
which is a base of data transmission of
the system.
 The MCUs in the nodes and terminals
can control sharing time period to
transfer and receive data.
System Structure (Cont’d)
 The radio circuit can work in UHF
wave band, and 433MHz can be used
freely.
 Because the 433MHz radio transmitter
can use built-in antenna and only one
direction transmission circuit, the whole
volume can be designed smaller and
easily built in a small box.
 433MHz ASK mode signal can reach
100 to 400 meters.
System Structure (Cont’d)
 The node is consisted of
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Radio data receiver
Embedded software system
GPRS model
ARM MCU
Power
Antenna
System Structure (Cont’d)
 Radio data receiver is a demodulating
circuit.
 This signal can be amplified and
demodulated, and then output data.
 By using RX3310A, receiver
sensitivity can be -100~102dbm.
System Structure (Cont’d)
 RX3310A is an integrated circuit produced by Taiwan
Hmark Company.
 It is designed specially for ASK remote control, data
transmission, and data receiving.
 It is consisted of
 Low-noise and high-frequency amplifier
 Frequency mixer
 Local oscillator
 Intermediate frequency amplifier
 Intermediate filter and comparer
 Its working frequency is 150-450MHz and maximum
rate of data transmission is 9.6Kbps.
System Structure (Cont’d)
 The monitor device of this system is consisted of
 PC
 Receiving module
 PC fulfils the main data processing and display tasks.
 It can receive the data from the nodes to analyze the
situation and then transmit the instructions to the
related devices, such as
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Sun visors
Lights
Temperature devices
spraying pumps
 Receiving module is consist of GPRS with TCP/IP, and the
received data is transferred to PC from RS232.
Software
Software
 Wireless sensor terminal software can
be divided into data receiving,
encoding, and transmission.
 MSP430 can realize super low power
consumption in Working and Stand-by
mode, so the software design must
consider about reducing power
consumption.
Software (cont’d)
 Sensor terminal work flow
Transmission ↙
Software (cont’d)
 The monitoring software is designed by
LabVIEW.
 It can be used conveniently in
controlling and programming.
 The powerful display function can be
used in displaying graphs (especially
on tendency chart) and processing
data.
Software (cont’d)
 Monitor system work flow
↘ Receive
Send ←
Conclusion
Conclusion
 They use MSP430 MCU sensor terminal
design and reduces system working power.
 Two button batteries can monitor for 2
years by recording 20 times per day and
0.4 sec per time.
 Using MSP430 MCU chip kernel circuit
covered with thick film, the volume is
similar to the size of 9V battery.
 The production cost can be limited in tens
of Yuan.
In my opinion
 Terrible English.
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need
in ?
 Unclear and incomplete content.
 Ex: No concrete experimental results.
 Poor structure.
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Comment Report
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Summary of contribution (shown to the authors)
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Detailed comments (shown to the authors)
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The authors applied wireless sensor networks to real agricultural
environments.
They considered volume, lifetime, and producing cost of the sensors
when designing their system.
There is too many syntactic and spelling errors in this paper.
Some content of this article is incomplete.
The structure of this article can be rearranged clearer.
There is no investigation into related works, so there is no evidence for
telling the audience that this paper really provides a new solution or
application in this area. Besides, there is also no other work to be
compared with the solution proposed by this paper.
Candidate for the best paper
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No.
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1 → Reject !
Final score (form 1 to 5)