The nRF Connect Lighting Example demonstrates how to remotely control a white dimmable light bulb. It uses buttons to test changing the lighting and device states and LEDs to show the state of these changes. You can use this example as a reference for creating your own application.
The example is based on CHIP and the nRF Connect platform, and supports remote access and control of a lighting over a low-power, 802.15.4 Thread network.
The example behaves as a CHIP accessory, that is a device that can be paired into an existing CHIP network and can be controlled by this network.
This example is running on the nRF Connect platform, which is based on the nRF Connect SDK and Zephyr RTOS. Visit CHIP's nRF Connect platform overview to read more about the platform structure and dependencies.
The CHIP device that runs the lighting application is controlled by the CHIP controller device over the Thread protocol. By default, the CHIP device has Thread disabled, and it should be paired with CHIP controller and get configuration from it. Some actions required before establishing full communication are described below.
The example also comes with a test mode, which allows to start Thread with the default settings by pressing button manually. However, this mode does not guarantee that the device will be able to communicate with the CHIP controller and other devices.
To commission the device onto a CHIP network, the device must be discoverable over Bluetooth LE. For security reasons, you must start Bluetooth LE advertising manually after powering up the device by pressing Button 4.
In CHIP, the commissioning procedure (called rendezvous) is done over Bluetooth LE between a CHIP device and the CHIP controller, where the controller has the commissioner role.
To start the rendezvous, the controller must get the commissioning information from the CHIP device. The data payload is encoded within a QR code, printed to the UART console, and shared using an NFC tag. For security reasons, you must start NFC tag emulation manually after powering up the device by pressing Button 4.
Last part of the rendezvous procedure, the provisioning operation involves sending the Thread network credentials from the CHIP controller to the CHIP device. As a result, device is able to join the Thread network and communicate with other Thread devices in the network.
The application requires the nRF Connect SDK v1.4.0 to work correctly.
The example supports building and running on the following devices:
| Board name | Board platform build name |
|---|---|
| nRF52840 DK | nrf52840dk_nrf52840 |
This section lists the User Interface elements that you can use to control and monitor the state of the device. All these elements can be located on the following board picture:
LED 1 shows the overall state of the device and its connectivity. The following states are possible:
Short Flash On (50 ms on/950 ms off) — The device is in the unprovisioned (unpaired) state and is waiting for a commissioning application to connect.
Rapid Even Flashing (100 ms on/100 ms off) — The device is in the unprovisioned state and a commissioning application is connected through Bluetooth LE.
Short Flash Off (950ms on/50ms off) — The device is fully provisioned, but does not yet have full Thread network or service connectivity.
Solid On — The device is fully provisioned and has full Thread network and service connectivity.
LED 2 simulates the light bulb and shows the state of the lighting. The following states are possible:
Solid On — The light bulb is on.
Off — The light bulb is off.
Button 1 can be used for the following purposes:
Pressed for 6 s — Initiates the factory reset of the device. Releasing the button within the 6-second window cancels the factory reset procedure. LEDs 1-4 blink in unison when the factory reset procedure is initiated.
Pressed for less than 3 s — Initiates the OTA software update process. This feature is not currently supported.
Button 2 — Pressing the button once changes the lighting state to the opposite one.
Button 3 — Pressing the button once starts the Thread networking in the test mode using the default configuration.
Button 4 — Pressing the button once starts the NFC tag emulation and enables Bluetooth LE advertising for the predefined period of time.
SEGGER J-Link USB port can be used to get logs from the device or communicate with it using the command line interface.
NFC port with antenna attached can be used to start the rendezvous by providing the commissioning information from the CHIP device in a data payload that can be shared using NFC.
Before building the example, check out the CHIP repository and sync submodules using the following command:
$ git submodule update --init
The example requires the nRF Connect SDK v1.4.0. You can either install it along with the related tools directly on your system or use a Docker image that has the tools pre-installed.
If you are a macOS user, you won't be able to use the Docker container to flash the application onto a Nordic board due to certain limitations of Docker for macOS. Use the native shell for building instead.
To use the Docker container for setup, complete the following steps:
If you do not have the nRF Connect SDK installed yet, create a directory for it by running the following command:
$ mkdir ~/nrfconnect
Download the latest version of the nRF Connect SDK Docker image by running the following command:
$ docker pull nordicsemi/nrfconnect-chip
Start Docker with the downloaded image by running the following command, customized to your needs as described below:
$ docker run --rm -it -e RUNAS=$(id -u) -v ~/nrfconnect:/var/ncs -v ~/connectedhomeip:/var/chip \
-v /dev/bus/usb:/dev/bus/usb --device-cgroup-rule "c 189:* rmw" nordicsemi/nrfconnect-chip
In this command:
Check out or update the nRF Connect SDK to the recommended v1.4.0 version by running the following command in the Docker container:
$ setup --ncs v1.4.0 /var/ncs repository is empty. Do you wish to check out nRF Connect SDK sources [v1.4.0]? [Y/N] y ... /var/chip repository is initialized, skipping...
Now you can proceed with the Building instruction.
To use the native shell for setup, complete the following steps:
Download and install the following additional software:
Depending on whether you have the nRF Connect SDK installed:
Follow the guide in the nRF Connect SDK documentation to install the nRF Connect SDK v1.4.0. Since command-line tools will be used for building the example, installing SEGGER Embedded Studio is not required.
If you have an older version of the SDK installed, use the following commands to update it to the recommended version. Replace nrfconnect-dir with the path to your nRF Connect SDK installation directory.
$ cd nrfconnect-dir/nrf $ git fetch origin $ git checkout v1.4.0 $ west update
Initialize environment variables referred to by the CHIP and the nRF Connect SDK build scripts. Replace nrfconnect-dir with the path to your nRF Connect SDK installation directory, and toolchain-dir with the path to GNU Arm Embedded Toolchain.
$ source nrfconnect-dir/zephyr/zephyr-env.sh $ export ZEPHYR_TOOLCHAIN_VARIANT=gnuarmemb $ export GNUARMEMB_TOOLCHAIN_PATH=toolchain-dir
Now you can proceed with the Building instruction.
Complete the following steps, regardless of the method used for setting up the environment:
Navigate to the example's directory:
$ cd examples/lighting-app/nrfconnect
Run the following command to build the example, with board-name replaced with the name of the Nordic Semiconductor's board you own, for example nrf52840dk_nrf52840:
$ west build -b board-name
You only need to specify the board name on the first build. See Requirements for the names of compatible boards.
The output zephyr.hex file will be available in the build/zephyr/ directory.
If you're planning to build the example for a different board or make changes to the configuration, remove all build artifacts before building. To do so, use the following command:
$ rm -r build
To build the example with release configuration that disables the diagnostic features like logs and command-line interface, run the following command:
$ west build -b board-name -- -DOVERLAY_CONFIG=third_party/connectedhomeip/config/nrfconnect/app/release.conf
Remember to replace board-name with the name of the Nordic Semiconductor's board you own.
The RPCs in lighting-common/pigweed-lighting.proto can be used to control various functionalities of the lighting app from a USB-connected host computer. To build the example with the RPC server, run the following command with board-name replaced with the name of the Nordic Semiconductor's board you own:
$ west build -b board-name -- -DOVERLAY_CONFIG=rpc.overlay
The Zephyr ecosystem is based on Kconfig files and the settings can be modified using the menuconfig utility.
To open the menuconfig utility, run the following command from the example directory:
$ west build -b board-name -t menuconfig
Remember to replace board-name with the name of the Nordic Semiconductor's board you own.
Changes done with menuconfig will be lost if the build directory is deleted. To make them persistent, save the configuration options in the prj.conf file. For more information, see the Configuring nRF Connect SDK examples page.
To flash the application to the device, use the west tool and run the following command from the example directory:
$ west flash
If you have multiple nRF52840 DK boards connected, west will prompt you to pick the correct one.
To debug the application on target, run the following command from the example directory:
$ west debug
Check the CLI tutorial to learn how to use command-line interface of the application.