Desmond Chen / Mbed OS mbed-os-example-ble-BatteryLevel_copy_copy

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readme.md@0:8113e6c77cd7, 2016-07-26 (annotated)

Committer:
Vincent Coubard
Date:
Tue Jul 26 14:19:17 2016 +0100
Revision:
0:8113e6c77cd7
Child:
2:18b05b3173a8
Update example at tag mbed-os-5.0.1-rc1

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Vincent Coubard 0:8113e6c77cd7 1 This example creates and updates a standard Battery Level service containing a single
Vincent Coubard 0:8113e6c77cd7 2 GATT characteristic.
Vincent Coubard 0:8113e6c77cd7 3
Vincent Coubard 0:8113e6c77cd7 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.
Vincent Coubard 0:8113e6c77cd7 5
Vincent Coubard 0:8113e6c77cd7 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.
Vincent Coubard 0:8113e6c77cd7 7
Vincent Coubard 0:8113e6c77cd7 8 # Running the application
Vincent Coubard 0:8113e6c77cd7 9
Vincent Coubard 0:8113e6c77cd7 10 ## Requirements
Vincent Coubard 0:8113e6c77cd7 11
Vincent Coubard 0:8113e6c77cd7 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 :
Vincent Coubard 0:8113e6c77cd7 13
Vincent Coubard 0:8113e6c77cd7 14 - [nRF Master Control Panel](https://play.google.com/store/apps/details?id=no.nordicsemi.android.mcp) for Android.
Vincent Coubard 0:8113e6c77cd7 15
Vincent Coubard 0:8113e6c77cd7 16 - [LightBlue](https://itunes.apple.com/gb/app/lightblue-bluetooth-low-energy/id557428110?mt=8) for iPhone.
Vincent Coubard 0:8113e6c77cd7 17
Vincent Coubard 0:8113e6c77cd7 18 Hardware requirements are in the [main readme](https://github.com/ARMmbed/mbed-os-example-ble/blob/master/README.md).
Vincent Coubard 0:8113e6c77cd7 19
Vincent Coubard 0:8113e6c77cd7 20 ## Building instructions
Vincent Coubard 0:8113e6c77cd7 21
Vincent Coubard 0:8113e6c77cd7 22 Building instructions for all samples are in the [main readme](https://github.com/ARMmbed/mbed-os-example-ble/blob/master/README.md).
Vincent Coubard 0:8113e6c77cd7 23
Vincent Coubard 0:8113e6c77cd7 24 ## Checking for success
Vincent Coubard 0:8113e6c77cd7 25
Vincent Coubard 0:8113e6c77cd7 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.
Vincent Coubard 0:8113e6c77cd7 27
Vincent Coubard 0:8113e6c77cd7 28 1. Build the application and install it on your board as explained in the building instructions.
Vincent Coubard 0:8113e6c77cd7 29 1. Open the BLE scanner on your phone.
Vincent Coubard 0:8113e6c77cd7 30 1. Start a scan.
Vincent Coubard 0:8113e6c77cd7 31
Vincent Coubard 0:8113e6c77cd7 32 ![](img/start_scan.png)
Vincent Coubard 0:8113e6c77cd7 33
Vincent Coubard 0:8113e6c77cd7 34 **figure 1** How to start scan using nRF Master Control Panel 4.0.5
Vincent Coubard 0:8113e6c77cd7 35
Vincent Coubard 0:8113e6c77cd7 36 1. Find your device; it should be named `BATTERY`.
Vincent Coubard 0:8113e6c77cd7 37
Vincent Coubard 0:8113e6c77cd7 38 ![](img/scan_result.png)
Vincent Coubard 0:8113e6c77cd7 39
Vincent Coubard 0:8113e6c77cd7 40 **figure 2** Scan results using nRF Master Control Panel 4.0.5
Vincent Coubard 0:8113e6c77cd7 41
Vincent Coubard 0:8113e6c77cd7 42 1. Establish a connection with your device.
Vincent Coubard 0:8113e6c77cd7 43
Vincent Coubard 0:8113e6c77cd7 44 ![](img/connection.png)
Vincent Coubard 0:8113e6c77cd7 45
Vincent Coubard 0:8113e6c77cd7 46 **figure 3** How to establish a connection using Master Control Panel 4.0.5
Vincent Coubard 0:8113e6c77cd7 47
Vincent Coubard 0:8113e6c77cd7 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.
Vincent Coubard 0:8113e6c77cd7 49
Vincent Coubard 0:8113e6c77cd7 50 ![](img/discovery.png)
Vincent Coubard 0:8113e6c77cd7 51
Vincent Coubard 0:8113e6c77cd7 52 **figure 4** Representation of the Battery service using Master Control Panel 4.0.5
Vincent Coubard 0:8113e6c77cd7 53
Vincent Coubard 0:8113e6c77cd7 54 1. Register for the notifications sent by the *Battery level* characteristic.
Vincent Coubard 0:8113e6c77cd7 55
Vincent Coubard 0:8113e6c77cd7 56 ![](img/register_to_notifications.png)
Vincent Coubard 0:8113e6c77cd7 57
Vincent Coubard 0:8113e6c77cd7 58 **figure 5** How to register to notifications using Master Control Panel 4.0.5
Vincent Coubard 0:8113e6c77cd7 59
Vincent Coubard 0:8113e6c77cd7 60
Vincent Coubard 0:8113e6c77cd7 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.
Vincent Coubard 0:8113e6c77cd7 62
Vincent Coubard 0:8113e6c77cd7 63 ![](img/notifications.png)
Vincent Coubard 0:8113e6c77cd7 64
Vincent Coubard 0:8113e6c77cd7 65 **figure 6** Notifications view using Master Control Panel 4.0.5
Vincent Coubard 0:8113e6c77cd7 66
Vincent Coubard 0:8113e6c77cd7 67 If you can see the characteristic, and if its value is incrementing correctly, the application is working properly.
Vincent Coubard 0:8113e6c77cd7 68