Edge Impulse: Data forwarder

The Edge Impulse data forwarder sample demonstrates the usage of Edge Impulse’s data forwarder to provide sensor data to Edge Impulse studio when Using Edge Impulse with nRF Connect SDK. The sample forwards simulated accelerometer data generated by the sensor_sim driver available in nRF Connect SDK.

Requirements

The sample supports the following development kits:

Hardware platforms	PCA	Board name	Build target
nRF9160 DK	PCA10090	nrf9160dk_nrf9160	nrf9160dk_nrf9160ns
nRF52 DK	PCA10040	nrf52dk_nrf52832	nrf52dk_nrf52832
nRF52840 DK	PCA10056	nrf52840dk_nrf52840	nrf52840dk_nrf52840

Overview

The sample periodically performs the following operations:

• Reads data from sensor. The sample reads simulated acceleration measurements for X, Y, and Z axes.

• Forwards the data through UART using the protocol specified by Edge Impulse’s data forwarder.

Note

The sample uses UART only to forward the sensor data. For this reason, sample logs are provided through RTT, unlike in other samples.

See Edge Impulse website for more information about the Edge Impulse platform.

Configuration

See Configuring your application for information about how to permanently or temporarily change the configuration.

Setup

Before running the sample, you must complete the following steps:

1. Prepare your own project using Edge Impulse studio external web tool. See Using Edge Impulse with nRF Connect SDK for more information about starting using the tool.

2. Follow the Edge Impulse CLI installation guide to install Edge Impulse command line tools. These tools are needed because the edge-impulse-data-forwarder is used to forward the data received from the device through UART to Edge Impulse studio.

Building and running

This sample can be found under samples/ei_data_forwarder in the nRF Connect SDK folder structure.

See Building and programming a sample application for information about how to build and program the application.

Testing

After programming the sample to your development kit, test it by performing the following steps:

1. Run the edge-impulse-data-forwarder Edge Impulse command line tool. The tool connects the device to your Edge Impulse project. See Edge Impulse’s data forwarder documentation for a guide.

2. Trigger sampling data from the device using Edge Impulse studio:

   1. Go to the Data acquisition tab.

   2. In the Record new data panel, set the desired values and click Start sampling.

      

      Sampling under Data acquisition in Edge Impulse studio

   3. Observe the received sample data on the raw data graph under the panel. For the default sample configuration, you should observe sine waves.

      

      Sampling example

Dependencies

This sample uses the following nRF Connect SDK drivers:

• drivers/sensor/sensor_sim

In addition, it uses the following Zephyr drivers:

• UART