Presentation from Third InDOG Doctoral Conference in Olomouc, Czech Republic. 13. - 16. October 2014

1. PARAMETERS OF WIRELESS SENSOR
NETWORK FOR TEMPERATURE
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MONITORING
Vendula HEJLOVÁ
Department of Geoinformatics, Palacký University in Olomouc
vendula.hejlova@upol.cz

2. Introduction
• Wireless Sensor Network
• Parameters of wireless sensor network that
have to be known at the beginning
• The research area
• Results
• Conclusion
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3. Wireless Sensor Network (WSN)
• new fast evolving technology that can be used in
environmental and socioeconomic domain
• every wireless sensor network consists of:
– nodes equipped with sensors
– gateway (gathering point)
– server (long time storage, visualization)
• every node communicates with the defined node(s)
to direct the measured values to a gateway (depends
on the used topology)
• electromagnetic waves are used for communication
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5. The Research Area
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6. Parameters of Wireless Sensor Network That
Have to be Known at the Beginning
• Application of Wireless Sensor Network
• Capabilities of Wireless Sensor Network
Components
• Terrain Factors
• Weather Conditions of the Research Area
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7. Capabilities of Wireless Sensor
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Network
• the used nodes – four Waspmote Plug&Sense,
produced by Libelium
• used sensors – temperature, relative humidity
• star topology
• communication was carried out on the basis of
802.15.4
– this protocol works in the range of 3.4 GHz, channel
0x0C (2.405 – 2.410 GHz)
• gathering point of data was gateway, Meshlium,
data were stored in local MySQL database
• observation period was from 8th April to 14th April
2014

8. Position of Nodes
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9. Topology of Wireless Sensor Network
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10. Terrain Factors
• related to:
– landcover,
– obstacles in the communication path,
– property conditions,
– security issue,
– measured elements
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11. Terrain Factors
• nodes were fixed at coniferous trees at a
height of 2 metres above the ground
• southwest orientation
• 10 minute recording intervals
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Results
• include the confirmation of transmission
protocol correctness
• visualization of average daily temperatures,
extreme temperatures and temperature
amplitudes

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Results
Average Daily
Temperatures
• the highest average
daily temperature at
place B (4)
• but the highest
average daily
temperature was
computed for place
A (13.79 °C)
• the lowest
15
14
13
12
11
10
9
8
7
6
5
4
3
temperatures mostly
2
occured at place C
1
(4), 4.03 °C 0
8.4.2014 9.4.2014 10.4.2014 11.4.2014 12.4.2014 13.4.2014 14.4.2014
AVERAGE DAILY TEMPERATURE
in the Botanic Garden from 8th to 14th April
A
B
C
D
Day
Temperature [°C]

14. 25
23
21
19
17
15
13
11
9
7
5
3
1
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Results
Extreme Temperatures
8.4.2014 9.4.2014 10.4.2014 11.4.2014 12.4.2014 13.4.2014 14.4.2014
-1
EXTREME TEMPERATURES
in the Botanic Garden in Olomouc
MAX
A
MAX
B
MAX
C
MAX
DAB
CD
MED
A
MED
B
MED
C
MED
D
Day
Temperature[°C]
• the highest number of the
highest daily temperatures
was recorded by node A (4)
• daily maximum
temperatures recorded by
node C were in the most
cases (5) the lowest
• the lowest temperatures
from minimum
temperatures were
recorded by node C (6)
• the highest temperature
values from minimum
temperatures were
obtained by node B (6)

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Results
Temperature Amplitudes
8.4.2014 9.4.2014 10.4.2014 11.4.2014 12.4.2014 13.4.2014 14.4.2014
20
19
18
17
16
15
14
13
12
11
10
0 1 2 3 4 5 6 7 8 9
TEMPERATURE AMPLITUDE
in the Botanic Garden from 8th to 14th April
A
B
C
D
Day
Temperature [°C]
• the highest
temperature
amplitudes were
recorded by node
A (4)
• the lowest
differences in
temperature
values were
recorded by node
D (4)

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Conclusion
• monitoring of temperature using wsn is realized in the real
time and with high density
• differences in measured temperature values are high even in
the small area
• the highest values of temperature amplitudes were recorded
by node A (13.92 °C), the lowest temperature amplitude was
recorded by node D (12.07 °C)
• this was a pilot study for testing of trasmission protocol and
investigating of differences between temperature values
measured under the same conditions in a small area
• measurements in larger area, with more nodes equipped with
more variety of sensors will be carried out during autumn
2014

17. • Thank you for your attention
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