MtM+ / Mbed OS Mt05_MtSense03

51 52 with same code

Dependencies:   BMA250E BMG160

readme.md@1:b8bbe971b26d, 2018-04-27 (annotated)

Committer:
johnathanlyu
Date:
Fri Apr 27 09:56:41 2018 +0000
Revision:
1:b8bbe971b26d
Parent:
0:e71874215e23 
51 52 with same code

Who changed what in which revision?

UserRevisionLine numberNew contents of line
johnathanlyu 0:e71874215e23 1 This example creates and updates a standard Battery Level service containing a single
johnathanlyu 0:e71874215e23 2 GATT characteristic.
johnathanlyu 0:e71874215e23 3
johnathanlyu 0:e71874215e23 4 The [battery service transmits](https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.battery_service.xml) a device's battery level in percentage, with 100% being a fully charged battery and 0% being a fully drained battery.
johnathanlyu 0:e71874215e23 5
johnathanlyu 0:e71874215e23 6 Although the sample application runs on a BLE device, it doesn't show the device's real battery level (because that changes very slowly and will make for a dull example). Instead, it transmits a fake battery level that starts at 50% (half charged). Every half second, it increments the battery level, going in single increments until reaching 100% (as if the battery is charging). It then drops down to 20% to start incrementing again.
johnathanlyu 0:e71874215e23 7
johnathanlyu 0:e71874215e23 8 # Running the application
johnathanlyu 0:e71874215e23 9
johnathanlyu 0:e71874215e23 10 ## Requirements
johnathanlyu 0:e71874215e23 11
johnathanlyu 0:e71874215e23 12 The sample application can be seen on any BLE scanner on a smartphone. If you don't have a scanner on your phone, please install :
johnathanlyu 0:e71874215e23 13
johnathanlyu 0:e71874215e23 14 - [nRF Master Control Panel](https://play.google.com/store/apps/details?id=no.nordicsemi.android.mcp) for Android.
johnathanlyu 0:e71874215e23 15
johnathanlyu 0:e71874215e23 16 - [LightBlue](https://itunes.apple.com/gb/app/lightblue-bluetooth-low-energy/id557428110?mt=8) for iPhone.
johnathanlyu 0:e71874215e23 17
johnathanlyu 0:e71874215e23 18 Hardware requirements are in the [main readme](https://github.com/ARMmbed/mbed-os-example-ble/blob/master/README.md).
johnathanlyu 0:e71874215e23 19
johnathanlyu 0:e71874215e23 20 ## Building instructions
johnathanlyu 0:e71874215e23 21
johnathanlyu 0:e71874215e23 22 Building instructions for all samples are in the [main readme](https://github.com/ARMmbed/mbed-os-example-ble/blob/master/README.md).
johnathanlyu 0:e71874215e23 23
johnathanlyu 0:e71874215e23 24 ## Checking for success
johnathanlyu 0:e71874215e23 25
johnathanlyu 0:e71874215e23 26 **Note:** Screens captures depicted below show what is expected from this example if the scanner used is *nRF Master Control Panel* version 4.0.5. If you encounter any difficulties consider trying another scanner or another version of nRF Master Control Panel. Alternative scanners may require reference to their manuals.
johnathanlyu 0:e71874215e23 27
johnathanlyu 0:e71874215e23 28 1. Build the application and install it on your board as explained in the building instructions.
johnathanlyu 0:e71874215e23 29 1. Open the BLE scanner on your phone.
johnathanlyu 0:e71874215e23 30 1. Start a scan.
johnathanlyu 0:e71874215e23 31
johnathanlyu 0:e71874215e23 32 ![](img/start_scan.png)
johnathanlyu 0:e71874215e23 33
johnathanlyu 0:e71874215e23 34 **figure 1** How to start scan using nRF Master Control Panel 4.0.5
johnathanlyu 0:e71874215e23 35
johnathanlyu 0:e71874215e23 36 1. Find your device; it should be named `BATTERY`.
johnathanlyu 0:e71874215e23 37
johnathanlyu 0:e71874215e23 38 ![](img/scan_result.png)
johnathanlyu 0:e71874215e23 39
johnathanlyu 0:e71874215e23 40 **figure 2** Scan results using nRF Master Control Panel 4.0.5
johnathanlyu 0:e71874215e23 41
johnathanlyu 0:e71874215e23 42 1. Establish a connection with your device.
johnathanlyu 0:e71874215e23 43
johnathanlyu 0:e71874215e23 44 ![](img/connection.png)
johnathanlyu 0:e71874215e23 45
johnathanlyu 0:e71874215e23 46 **figure 3** How to establish a connection using Master Control Panel 4.0.5
johnathanlyu 0:e71874215e23 47
johnathanlyu 0:e71874215e23 48 1. Discover the services and the characteristics on the device. The *Battery service* has the UUID 0x180F and includes the *Battery level* characteristic which has the UUID 0x2A19.
johnathanlyu 0:e71874215e23 49
johnathanlyu 0:e71874215e23 50 ![](img/discovery.png)
johnathanlyu 0:e71874215e23 51
johnathanlyu 0:e71874215e23 52 **figure 4** Representation of the Battery service using Master Control Panel 4.0.5
johnathanlyu 0:e71874215e23 53
johnathanlyu 0:e71874215e23 54 1. Register for the notifications sent by the *Battery level* characteristic.
johnathanlyu 0:e71874215e23 55
johnathanlyu 0:e71874215e23 56 ![](img/register_to_notifications.png)
johnathanlyu 0:e71874215e23 57
johnathanlyu 0:e71874215e23 58 **figure 5** How to register to notifications using Master Control Panel 4.0.5
johnathanlyu 0:e71874215e23 59
johnathanlyu 0:e71874215e23 60
johnathanlyu 0:e71874215e23 61 1. You should see the battery level value change every half second. It begins at 50, goes up to 100 (in steps of 1), resets to 20 and so on.
johnathanlyu 0:e71874215e23 62
johnathanlyu 0:e71874215e23 63 ![](img/notifications.png)
johnathanlyu 0:e71874215e23 64
johnathanlyu 0:e71874215e23 65 **figure 6** Notifications view using Master Control Panel 4.0.5
johnathanlyu 0:e71874215e23 66
johnathanlyu 0:e71874215e23 67 If you can see the characteristic, and if its value is incrementing correctly, the application is working properly.
johnathanlyu 0:e71874215e23 68