Sensors Readings on a Local Webserver

This tutorial teaches you how to set up the Nicla Sense ME and your computer to use the already built tool to get data and configure the board using a CLI app.


It is possible to configure the Nicla Sense ME to communicate via Serial over USB or Bluetooth® Low Energy using a tool called bhy-controller. This is a CLI tool that can configure the sensors, get their readings and provide this information via a local webserver or display it in the command line interface.


  • How to install Go Lang
  • How to set up the Nicla Sense ME
  • How to use the bhy-controller tool to: configure and read the sensors through the terminal (CLI commands)
  • How to use the bhy-controller tool to: run the webserver, configure and read the sensors on your internet browser

Required Hardware and Software

  • Nicla Sense ME
  • Nicla Sense ME library (Arduino_BHY2)
  • Micro USB-A cable (USB-A to Micro USB-A)
  • Arduino IDE 1.8.10+ or Arduino Pro IDE 0.0.4+
  • Go Lang
  • MKR Board (Only required for DFU)

The bhy-controller tool can be downloaded from while the libraries can be obtained via library manager in the Arduino IDE / CLI.


Building the Bhy-Controller Tool Manually

Bhy-Controller is a tool which allows us to configure the Nicla Sense ME sensors through the terminal console and read their values. We will use the "Go" compiler to create the bhy-controller CLI tool.

First, please go to Go's download page and follow the instructions depending on your OS. Then check that you have "go" in your environment variable PATH. We need the bhy-controller folder for the next step, it can be found here, remember where you extract this folder, we will need to navigate to it in the next step. Now open a terminal console and open the directory tools/bhy-controller/src and type

go build bhy.go
, after that you will see a new file called bhy (.exe if you are on Windows).

Set up the Board

First we need to download the library Arduino_BHY2 in the Arduino IDE. Next we need to upload the App.ino example sketch inside the library. This sketch can be found in: Examples > Arduino_BHY2 > App.ino. Select the sketch and upload it to your board.

Use the Bhy-Controller

Open your terminal console and open the directory tools/bhy-controller/src where we already built the bhy program tool(bhy.exe on windows).

Now to use the tool, the basic syntax is introducing the name of the program,

, followed by the command we want to use, plus its arguments.

Once the board is set up and connected we can verify it by using the command:

1bhy list


is the program and
is the command. This command will print the list of devices connected to the serial ports. After checking that the program works and the Nicla is connected, to configure and read the sensors data we have 2 options: using a WebAPP or the CLI.

Running the Web App

When we run the Web application we are going to connect through Bluetooth® to the Nicla Sense ME and we will configure the sensors inside the browser. This application is going to use WebBLE from your browser.

For this feature to work, make sure that WebBLE is both supported and enabled! In Google Chrome go to chrome://flags and enable "Experimental Web Platform features". Check the browser list to confirm that your browser has this feature.

So let's run the app by going to the directory of the bhy-controller app and enter the next command:

1bhy webserver

This will start a local server hosted at <localhost:8000>

Click the button "Open sensor page" and you will see:

Sensor page in the browser
Sensor page in the browser

To pair your Nicla Sense ME, first make sure you have uploaded the App.ino from the examples. Then click on the connect button, if the WebBLE is configured a window will open that will ask you to allow/block the access to Bluetooth®. Now select the Nicla Sense ME device on the list, if the connection succeeded, the current status will change to connected and it will turn green.

Now you need to configure the sensors you want to get the data from, check the Nicla Sense ME Cheat sheet sensor IDs for the ID number of the desired sensor.

To configure the sensor and get the data, enter the sensor ID, e.g Gyroscope is #10. Entering a sample rate that is greater than 0 will enable the sensor. Now press the configure button, it will be visible in the table below, as shown in the image.

Configured sensor
Configured sensor

Configure a Sensor with CLI Commands


We can set the rate and the latency of each sensor, please check the Nicla Sense ME Cheat sheet sensor IDs to configure the right one.

The syntax for configuring a sensor is:

bhy sensor config -p <YourCOMPort> -sensor <SENSORID> -rate <RATE> -latency <LATENCY>

For example if we want to configure the Gyroscope passthrough which has the sensor ID #10 connected on the port

with a rate of 1Hz and a latency of 0ms we would enter:

bhy sensor config -p /dev/ttyACM2 -sensor 10 -rate 1 -latency 0

Now it's configured to output the reading every second (1Hz).


If we set the latency and rate to 0 the sensor will be disabled and it will not output any data.

bhy sensor config -p <YourCOMPort> -sensor <SENSORID> -rate 0 -latency 0

Read Data From a Sensor

If we want to read data from a sensor and print it once, we use:

bhy sensor read -p <YourCOMPort>

To do it continuously we add the parameter


bhy sensor read -live -p <YourCOMPort>

Using a Passthrough Board with CLI

When we have a firmware for the BHI module or a sketch for the MCU already compiled in a .bin file, we can upload them through a MKR or Portenta board directly using the terminal. We need to upload a passthrough sketch to the MKR or Portenta board. Allowing the Nicla to communicate with the computer through the host board. The sketch can be found at Examples > Arduino_BHY_HOST > Passthrough.ino.

We then need to connect the Nicla board to the desired passthrough board with an Eslov cable, or we can mount the Nicla onto the board as a shield. If you wish to mount the Nicla as a shield, take a look at this tutorial. Now that we have everything set up, we can use the commands below to upload firmware or a sketch, if they are in the right format.

Upload a Sketch

Syntax for uploading sketch:

bhy dfu -t nicla -bin <CompiledSketch.bin> -p <MKRBoardCOMPort>

Updating Firmware

Syntax for uploading firmware:

bhy dfu -t bhi -bin <CompiledFirmware.bin> -p <MKRBoardCOMPort>


This tutorial shows how to set up the board so it can communicate with both the Web Application and the CLI.

You also learned the commands to configure, get data from the board with the Web Application and the CLI. We also went through how to launch the Web Application from your terminal.

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