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6. Device operation
6.1. Initialization
In the following, we show a symbolic design of the MobECG application, because the actual
implementation is Android OS dependant.
6.1.1. Activating the MobECG service
Upon installation, the MobECG service is activated with tap on the application icon. When
activated, the MobECG application icon will appear on the top task bar of the PDA. For transfer
of the measurements from the Savvy sensor to the PDA, MobECG requires that the Bluetooth
on the PDA is activated. If not, the application displays a warning that it wants to turn on
Bluetooth. Make sure you allow for the Bluetooth to be turned on.
At start-up, the overview screen of MobECG is displayed (Figure 9a). This is considered as the
main screen where you can control the measurements (start and stop), and where details about
the measurement and paired Savvy sensors are displayed. All other options of the application
are available by clicking on the menu at the top left corner (Figure 9b), will appear.
NOTE: The main application screen is the only one that cannot be rotated.
(a) (b)
Figure 9: MobECG symbolic design of (a) the main overview screen and (b) the application menu.
6.1.2. Selection of Savvy sensor
The first step after starting MobECG is to connect the Savvy sensor placed on the body with the
application. Click on “Select Savvy” in the application menu. The application will open a screen
where it scans for wireless devices in the vicinity of the PDA (Figure 10). The scanning is
automatically refreshed with the devices with the highest signal strength floating at the top of
the list. You can pause the sorting of list items by clicking on the button named “STOP SORTING”.
To select your Savvy sensor, identify its name and MAC address on the list and click on it. A
Savvy sensor authorization windows pops up (Figure 10b). Enter the 4-digit PIN provided at the
end of this User’s manual and click “OK”. After successful authorization, the Savvy sensor is
highlighted yellow (Figure 10c).
NOTE: The PIN is requested only the first time when the Savvy sensor is paired with the PDA.