This application implements a basic wireless sensor.
The application reads the sensor and uses NORA-B1 Bluetooth to broadcast the sensor measurements.
It does that by spending the measurement data to Bluetooth LE Manufacturer-specific Advertising Data.
So the device broadcasts the measurements, and any Bluetooth device that performs a scan operation within range, can get these data without the need for pairing.
This is the starting point, to read and broadcast the measurements, so that a Gateway can receive those measurements and send them to the MQTT Broker.
You will need a MINI-NORA-B1 Evaluation kit and connect the MikroE HVAC Click board MIKROE-4290 to mikroBUS slot 1.
The example is built using nRF Connect SDK version 1.9.1 and is advised to use this version to build the Sensor Bluetooth LE Broadcaster.\
You can build the application as any other Zephyr project (you can get some help here).
This application is set up to compile and create an image that needs a J-Link to be programmed in MINI-NORA-B1.
The option to compile it as an updatable image for use with a bootloader is not implemented.
There are 2 (possible 3 revisions of the board in the future):
- Rev B
- Rev C (and possible D)
The revision identifier can be found at the back of the board just below mikroBUS port one:
According to the revision the right device overlay must be chosen when creating the build configuration for the project.
To prepare the build configuration:
- Click the NRF tools icon on the right toolbar.
- Make sure the correct SDK is selected
1.9.1 - Click
Create new build configuration
On the Add Build Configuration menu:
- Select the appropriate board type
nrf5340dk_nrf5340_cpuapp - From the drop down menu select project
Configuration - In the
Devicetree overlayselect you overlay depending on the revision of the board - Select a name for your build directory
You can flash the project as any other Zephyr project (using VS Code is recommended). A J-Link is required to Flash the application. You can get some help on Flashing here.
This application uses both the APPLICATION and NETWORK cores of nRF5340 in NORA-B1.
If you want to flash the project, after building:
- You can use VS Code to Flash the device (recommended)
- You can use
build/zephyr/merged_domains.hexfile to program the app with nRF Connect -> Programmer application. - You can use nrftools to program the device with command line. You can use
build/zephyr/zephyr.hexandbuild\hci_rpmsg\zephyr\zephyr.hexfiles for this.
The sensor driver should work properly as is.
There are not many options offered for the project.
You could change the name of the device for advertising but is highly not recommended since then you would need to also change payload sizes for BLE communication.
When running the application, at the UART console output you should see something like this
The driver used in this application is taken from MikroE libstock repo and modified to be compatible with Zephyr drivers structure.
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