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Week 3

The objective of the third week

During this week, our group mainly studied the iBeacon, which used for indoor positioning and research the relationship between the distance and the RSSI produced by Ibeacon.

The process of the third week

Firstly, we download an APP called LightBlue which can change the major, minor, name, etc. it is shown in figure blow.
Figure 1:The LightBule application
Then, we entered to the LightBlue and find the name of the iBeacon in the Peripherals nearby list. when we put the iBeacon nearly to phone .the signal will be strong and when we put the iBeacon a little far will cut down and changed the name of iBeacon: anchor 0, anchor 1, anchor 2, anchor 3. It should be noted that we must pay attention to the correct password before changing. The password is marked on the back of iBeacon. At the same time, we change the TX power. When we set TX power high, it will cost much power , but the distance range will be long.
Finally, we changed the broadcast time interval, we wrote the value from APP and wrote decimal of the value >100(0x64) Set time_data_package= 100. Our group wrote 1 (0x01) from APP , that’s means the broadcast time interval = 1*100 ms=100ms.
Next we made actual measurements and measured the RSSI between each iBeacon and the phone at different distances. The measurement process is shown below.
Figure 2: The measurement process 
Then we got the image which is shown blow.
Figure 3:The curve of the measured RSSI
Because there are a lot of measurement pictures, because it is inconvenient for readers to read, it is organized into forms for people to watch. 

Figure 4:The measurable data of the RSSI and distance

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