Campbell HydroSense II Podręcznik Użytkownika Pobierz pdf (Strona 18)

HydroSense II Soil Moisture Measurement System

7.4 Connecting via Bluetooth

The steps to forming a successful Bluetooth connection are as follows:

Start the HydroSense II software.

Turn on the HydroSense II display by holding the Power button for 3

seconds.

Using the software, click the Discover button to find Bluetooth devices

within range.

Once the HydroSense II has been discovered, click the “Connect”

button.

The first time that the HydroSense II is used with a new computer is necessary to

“pair” the computer and the HydroSense II before a connection can be made.

The pairing code is “1234”.

For more information, please refer to the HydroSense II Software User Guide

While a Bluetooth connection is open, the HydroSense II will not shut down. It is

important to disconnect the Bluetooth once data has been collected or settings

updated to avoid unduly shortening the battery life. Once the Bluetooth

connection is closed the device will power down as normal.

7.5 Collecting data

To collect data it is first necessary to establish a Bluetooth connection (see

above), however data can then be downloaded to the computer by clicking on the

“Synchronise” button in the HydroSense II software. The synchronisation

process will download any new water content data, update the zone table and

configuration settings.

For more information, please refer to the HydroSense II Software User Guide.

8 GPS

The HydroSense II incorporates a receiver for the Global Positioning System

(GPS). This is a group of satellites in medium earth orbit (MEO) maintained by

the US Department of Defense for global navigation. The system provides

extremely accurate time and position information using a relatively inexpensive

radio receiver. In order to calculate position, the GPS module needs to receive

radio time signals from at least 4 satellites simultaneously, and it uses the slight

time shifts in these received signals to calculate the receiver’s position in space.

If the receiver detects signals from more than 4 satellites, it will use the data

from these extra satellites to generate a more accurate position.

8.1 GPS synchronisation

Since the GPS satellites are in orbit at an altitude of approximately 20000 km,

their radio signals are quite weak at the surface of the earth and they do not

penetrate buildings well. It is therefore generally necessary to be outdoors with a

clear view of the sky to reliably receive strong signals from the 4 or more

satellites required to calculate position. When the receiver has an adequate signal

from at least 4 satellites and has resolved the current position it is said that the

GPS has achieved “synchronisation”.

The GPS antenna of the HydroSense II is located inside the case above the LCD

facing upward toward the sky when held upright in a comfortable reading

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Campbell HydroSense II Podręcznik Użytkownika Strona 18

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