This example uses the Health Thermometer Profile to send thermometer information: The canonical source for this example lives at https://github.com/ARMmbed/mbed-os-example-ble/tree/master/BLE_Thermometer

Thermometer

This example uses the Health Thermometer Profile to send thermometer information:

  • Sensor location: thermometer placement on the body. The default value in this application is the ear (``LOCATION_EAR``). The characteristic description shows the other possible values.
  • Temperature: the initial temperature is 39.6, and it's incremented by 0.1 every half second. It resets to 39.6 when it reaches 43.0.

For more information see:

  • Temperature Type: GATT characteristic details for temperature type (sensor location).

Running the application

Requirements

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 :

- nRF Master Control Panel for Android.

- LightBlue for iPhone.

Hardware requirements are in the main readme.

Building instructions

Building with mbed CLI

If you'd like to use mbed CLI to build this, then you should refer to the main readme. The instructions here relate to using the developer.mbed.org Online Compiler

In order to build this example in the mbed Online Compiler, first import the example using the ‘Import’ button on the right hand side.

Next, select a platform to build for. This must either be a platform that supports BLE, for example the NRF51-DK, or one of the following:

List of platforms supporting Bluetooth Low Energy

Or you must also add a piece of hardware and the supporting library that includes a Bluetooth Low Energy driver for that hardware, for example the K64F or NUCLEO_F401RE with the X-NUCLEO-IDB05A1

List of components supporting Bluetooth Low Energy.

Once you have selected your platform, compile the example and drag and drop the resulting binary onto your board.

For general instructions on using the mbed Online Compiler, please see the mbed Handbook

Checking for success

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.

  • Build the application and install it on your board as explained in the building instructions.
  • Open the BLE scanner on your phone.
  • Start a scan.

https://developer.mbed.org/teams/mbed-os-examples/code/mbed-os-example-ble-Thermometer/raw-file/a27dfda81620/img/start_scan.png

figure 1 How to start scan using nRF Master Control Panel 4.0.5

  • Find your device; it should be named *Therm*.

https://developer.mbed.org/teams/mbed-os-examples/code/mbed-os-example-ble-Thermometer/raw-file/a27dfda81620/img/scan_results.png

figure 2 Scan results using nRF Master Control Panel 4.0.5

  • Establish a connection with your device.

https://developer.mbed.org/teams/mbed-os-examples/code/mbed-os-example-ble-Thermometer/raw-file/a27dfda81620/img/connection.png

figure 3 How to establish a connection using Master Control Panel 4.0.5

  • Discover the services and the characteristics on the device. The *Health Thermometer* service has the UUID `0x1809` and includes the *Temperature Measurement* characteristic which has the UUID `0x2A1C`.

https://developer.mbed.org/teams/mbed-os-examples/code/mbed-os-example-ble-Thermometer/raw-file/a27dfda81620/img/discovery.png

figure 4 Representation of the Thermometer service using Master Control Panel 4.0.5

  • Register for the notifications sent by the *Temperature Measurement* characteristic.

https://developer.mbed.org/teams/mbed-os-examples/code/mbed-os-example-ble-Thermometer/raw-file/a27dfda81620/img/register_to_notifications.png

figure 5 How to register to notifications using Master Control Panel 4.0.5

  • You should see the temperature value change every half second. It begins at 39.6, goes up to 43.0 (in steps of 0.1), resets to 39.6 and so on.

https://developer.mbed.org/teams/mbed-os-examples/code/mbed-os-example-ble-Thermometer/raw-file/a27dfda81620/img/notifications.png

figure 6 Notifications view using Master Control Panel 4.0.5

Committer:
mbed_official
Date:
Thu Jul 28 23:14:56 2016 +0100
Revision:
2:cc8349878a7d
Parent:
1:0802a5f8c9d3
Child:
11:4e356c89ad66
Merge branch 'master' of https://github.com/ARMmbed/mbed-os-example-ble


Commit copied from ./src/github.com/ARMmbed/mbed-os-example-ble

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 2:cc8349878a7d 1 /* mbed Microcontroller Library
mbed_official 2:cc8349878a7d 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 2:cc8349878a7d 3 *
mbed_official 2:cc8349878a7d 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 2:cc8349878a7d 5 * you may not use this file except in compliance with the License.
mbed_official 2:cc8349878a7d 6 * You may obtain a copy of the License at
mbed_official 2:cc8349878a7d 7 *
mbed_official 2:cc8349878a7d 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 2:cc8349878a7d 9 *
mbed_official 2:cc8349878a7d 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 2:cc8349878a7d 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 2:cc8349878a7d 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 2:cc8349878a7d 13 * See the License for the specific language governing permissions and
mbed_official 2:cc8349878a7d 14 * limitations under the License.
mbed_official 2:cc8349878a7d 15 */
mbed_official 2:cc8349878a7d 16
mbed_official 2:cc8349878a7d 17 #include <mbed-events/events.h>
mbed_official 2:cc8349878a7d 18 #include "mbed.h"
mbed_official 2:cc8349878a7d 19 #include "ble/BLE.h"
mbed_official 2:cc8349878a7d 20 #include "ble/services/HealthThermometerService.h"
mbed_official 2:cc8349878a7d 21
mbed_official 2:cc8349878a7d 22 DigitalOut led1(LED1, 1);
mbed_official 2:cc8349878a7d 23
mbed_official 2:cc8349878a7d 24 const static char DEVICE_NAME[] = "Therm";
mbed_official 2:cc8349878a7d 25 static const uint16_t uuid16_list[] = {GattService::UUID_HEALTH_THERMOMETER_SERVICE};
mbed_official 2:cc8349878a7d 26
mbed_official 2:cc8349878a7d 27 static float currentTemperature = 39.6;
mbed_official 2:cc8349878a7d 28 static HealthThermometerService *thermometerServicePtr;
mbed_official 2:cc8349878a7d 29
mbed_official 2:cc8349878a7d 30 static EventQueue eventQueue(
mbed_official 2:cc8349878a7d 31 /* event count */ 16 * /* event size */ 32
mbed_official 2:cc8349878a7d 32 );
mbed_official 2:cc8349878a7d 33
mbed_official 2:cc8349878a7d 34 /* Restart Advertising on disconnection*/
mbed_official 2:cc8349878a7d 35 void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *)
mbed_official 2:cc8349878a7d 36 {
mbed_official 2:cc8349878a7d 37 BLE::Instance().gap().startAdvertising();
mbed_official 2:cc8349878a7d 38 }
mbed_official 2:cc8349878a7d 39
mbed_official 2:cc8349878a7d 40 void updateSensorValue(void) {
mbed_official 2:cc8349878a7d 41 /* Do blocking calls or whatever is necessary for sensor polling.
mbed_official 2:cc8349878a7d 42 In our case, we simply update the Temperature measurement. */
mbed_official 2:cc8349878a7d 43 currentTemperature = (currentTemperature + 0.1 > 43.0) ? 39.6 : currentTemperature + 0.1;
mbed_official 2:cc8349878a7d 44 thermometerServicePtr->updateTemperature(currentTemperature);
mbed_official 2:cc8349878a7d 45 }
mbed_official 2:cc8349878a7d 46
mbed_official 2:cc8349878a7d 47 void periodicCallback(void)
mbed_official 2:cc8349878a7d 48 {
mbed_official 2:cc8349878a7d 49 led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
mbed_official 2:cc8349878a7d 50
mbed_official 2:cc8349878a7d 51 if (BLE::Instance().gap().getState().connected) {
mbed_official 2:cc8349878a7d 52 eventQueue.post(updateSensorValue);
mbed_official 2:cc8349878a7d 53 }
mbed_official 2:cc8349878a7d 54 }
mbed_official 2:cc8349878a7d 55
mbed_official 2:cc8349878a7d 56 void onBleInitError(BLE &ble, ble_error_t error)
mbed_official 2:cc8349878a7d 57 {
mbed_official 2:cc8349878a7d 58 /* Initialization error handling should go here */
mbed_official 2:cc8349878a7d 59 }
mbed_official 2:cc8349878a7d 60
mbed_official 2:cc8349878a7d 61 void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
mbed_official 2:cc8349878a7d 62 {
mbed_official 2:cc8349878a7d 63 BLE& ble = params->ble;
mbed_official 2:cc8349878a7d 64 ble_error_t error = params->error;
mbed_official 2:cc8349878a7d 65
mbed_official 2:cc8349878a7d 66 if (error != BLE_ERROR_NONE) {
mbed_official 2:cc8349878a7d 67 onBleInitError(ble, error);
mbed_official 2:cc8349878a7d 68 return;
mbed_official 2:cc8349878a7d 69 }
mbed_official 2:cc8349878a7d 70
mbed_official 2:cc8349878a7d 71 if (ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
mbed_official 2:cc8349878a7d 72 return;
mbed_official 2:cc8349878a7d 73 }
mbed_official 2:cc8349878a7d 74
mbed_official 2:cc8349878a7d 75 ble.gap().onDisconnection(disconnectionCallback);
mbed_official 2:cc8349878a7d 76
mbed_official 2:cc8349878a7d 77 /* Setup primary service. */
mbed_official 2:cc8349878a7d 78 thermometerServicePtr = new HealthThermometerService(ble, currentTemperature, HealthThermometerService::LOCATION_EAR);
mbed_official 2:cc8349878a7d 79
mbed_official 2:cc8349878a7d 80 /* setup advertising */
mbed_official 2:cc8349878a7d 81 ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE);
mbed_official 2:cc8349878a7d 82 ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list));
mbed_official 2:cc8349878a7d 83 ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::THERMOMETER_EAR);
mbed_official 2:cc8349878a7d 84 ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME));
mbed_official 2:cc8349878a7d 85 ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED);
mbed_official 2:cc8349878a7d 86 ble.gap().setAdvertisingInterval(1000); /* 1000ms */
mbed_official 2:cc8349878a7d 87 ble.gap().startAdvertising();
mbed_official 2:cc8349878a7d 88 }
mbed_official 2:cc8349878a7d 89
mbed_official 2:cc8349878a7d 90 void scheduleBleEventsProcessing(BLE::OnEventsToProcessCallbackContext* context) {
mbed_official 2:cc8349878a7d 91 BLE &ble = BLE::Instance();
mbed_official 2:cc8349878a7d 92 eventQueue.post(Callback<void()>(&ble, &BLE::processEvents));
mbed_official 2:cc8349878a7d 93 }
mbed_official 2:cc8349878a7d 94
mbed_official 2:cc8349878a7d 95 int main()
mbed_official 2:cc8349878a7d 96 {
mbed_official 2:cc8349878a7d 97 eventQueue.post_every(500, periodicCallback);
mbed_official 2:cc8349878a7d 98
mbed_official 2:cc8349878a7d 99 BLE &ble = BLE::Instance();
mbed_official 2:cc8349878a7d 100 ble.onEventsToProcess(scheduleBleEventsProcessing);
mbed_official 2:cc8349878a7d 101 ble.init(bleInitComplete);
mbed_official 2:cc8349878a7d 102
mbed_official 2:cc8349878a7d 103 while (true) {
mbed_official 2:cc8349878a7d 104 eventQueue.dispatch();
mbed_official 2:cc8349878a7d 105 }
mbed_official 2:cc8349878a7d 106
mbed_official 2:cc8349878a7d 107 return 0;
mbed_official 2:cc8349878a7d 108 }