Home Automation Using Raspberry Pi Matrix Voice And Snips

About the project

Controlling lights, door and light intensity using Raspberry Pi, Matrix Voice and Snips.

Project info

Difficulty: Expert

Platforms: Raspberry Pi

Estimated time: 7 hours

License: GNU General Public License, version 3 or later (GPL3+)

Items used in this project

Hardware components

Tiny Breadboard Tiny Breadboard x 8
Raspberry Pi 3 Model B Raspberry Pi 3 Model B x 1
Rf Energy Lab Box Rf Energy Lab Box Use either Matrix Creator or Voice x 1
Usb A/micro Cable - 2m Usb A/micro Cable - 2m x 1
Sd Card Adapter Sd Card Adapter x 1
Rf Energy Lab Box Rf Energy Lab Box Use for microphone x 1

Software apps and online services

Snips Snips
Raspberry Pi Raspbian Raspberry Pi Raspbian

Hand tools and fabrication machines

MATRIX Labs Matrix-lite-js MATRIX Labs Matrix-lite-js x 1


The story

Home automation allows us to control household electrical appliances like light, door, fan, and so on. Home automation not only refers to reduce human efforts but also energy efficiency and time saving.


  • Offline (No internet connection needed)
  • Controlling brightness of lights using voice
  • Display data on web
  • Display intensity value in gauge
  • Login Page with security (Not able to access main page without login )
  • Send data on email and clear the logs (For sending the data internet is required)
  • Email notification after login (Internet needed)

In this project, Raspberry Pi is connected with Matrix Voice via GPIO pins and all the six lights (such as bedroom, kitchen light) and a door which we are controlling through voice command are interfaced with expansion GPIO pins of Matrix Voice. We are providing input(voice command) through Matrix voice mic and taking output (response) as light on/off or change in light intensity or door open/close from GPIO of Matrix Voice.

I also made a webpage with security to see the logs and the last intensity value in gauge.

Component Needed

Total cost of project is around $ 115

Matrix Voice

The Matrix Voice is a development board for building sound driven behaviors and interfaces. It is an user-friendly tool for simple to complex Internet of Things (IoT) voice app creation. It comes under two versions (Matrix Voice & Matrix Voice ESP32 version).

Both versions of these boards run the same on a Raspberry Pi, however, the Matrix Voice ESP32 version has the option to run standalone by programming the ESP32 module.

In this project I am using Matrix voice

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Matrix Voice expansion GPIO

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DF## pins are equivalent to GPIO## pins.

Raspberry Pi GPIO

Note:- The expansion GPIOs on the Matrix Voice are not connected to the RPi GPIOs. The expansion GPIOs mostly come from the FPGA.

Raspberry Pi


  • Broadcom BCM2837B0, Cortex-A53 (ARMv8) 64-bit SoC @ 1.4GHz
  • 2.4GHz and 5GHz IEEE 802.11.b/g/n/ac wireless LAN, Bluetooth 4.2, BLE
  • Gigabit Ethernet over USB 2.0 (maximum throughput 300 Mbps)
  • Extended 40-pin GPIO header
  • Full-size HDMI
  • 4 USB 2.0 ports
  • CSI camera port for connecting a Raspberry Pi camera
  • DSI display port for connecting a Raspberry Pi touchscreen display
  • 4-pole stereo output and composite video port
  • Micro SD port for loading your operating system and storing data
  • 5V/2.5A DC power input
  • Power-over-Ethernet (PoE) support (requires separate PoE HAT)

GPIO pins

How to connect Matrix Voice with RPi 3

Before installing Matrix Core make sure you have setup Matrix voice. For that you need

  • Raspberry Pi 3 Model B+
  • 5V 2.5A Micro USB Power Supply
  • Matrix Voice

1. Insert flashed microSD card into Raspberry Pi

2. Attach Matrix Voice onto Raspberry Pi GPIO pins

3. Power Raspberry Pi with micro USB power supply

You will see Creamish light glowing with increasing brightness.

Once done next step is installing Matrix Core in your RPi.

Matrix core installation on RPi

1. Add the Matrix repository and key.

curl | sudo apt-key add -
echo "deb $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/matrixlabs.list

Matrix repository for Matrix HAL

curl | sudo apt-key add -echo "deb $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/matrixlabs.list

sudo apt-get update
sudo apt-get upgrade

2. Install the the Matrix Core packages.

sudo apt-get install matrixio-malos

sudo reboot

Install the the MATRIX HAL packages.

sudo apt-get install matrixio-creator-init libmatrixio-creator-hal libmatrixio-creator-hal-dev 

Reboot your device.

sudo reboot 

3. To install ZeroMQ

echo "deb ./" | sudo tee /etc/apt/sources.list.d/zeromq.list
wget -O- | sudo apt-key add

4. JavaScript setup

Create a node project folder in the home directory of RPi

cd ~/
mkdir js-matrix-core-app (whatever name you want)
cd js-matrix-core-app
npm init

5. Installing npm Packages for ZMQ and Protocol Buffers

To install the ZMQ and MATRIX Protocol Buffers npm packages. Make sure you are in directory which you created above (name you give). Here I gave it js-matrix-core-app. This allows you to interact with Matrix Core through Node.js.

npm install zeromq --save
npm install matrix-protos --save 

Now you are done with Matrix core and Matrix HAL.

As I am using JavaScript, so to use PWM for external LEDs I am using Matrix lite library. To install it use command shown below make sure you are in same directory which we created while installing Matrix core.

cd js-matrix-core-app 
npm init -y
npm install @matrix-io/matrix-lite --save

What is snips

Snips is an AI voice platform for connected devices. It is an end-to-end solution with Speech Recognition and Natural Language Understanding, enabling anyone to add a customizable voice assistant to their product. Snips is the only deep-learning based voice platform that runs fully on-device. It can run without the need for a server or the cloud. It offers Privacy by Design.

How to install the Snips using SAM CLI tool

For this make sure all the steps mentioned above are working

I. Raspberry Pi

1. To Install the matrix Kernel Modules. Run the following commands in your Raspberry Pi's terminal to add the matrix repository & key and update your repository packages.

curl | sudo apt-key add -
echo "deb $(lsb_release -sc) main" | sudo tee /etc/apt/sources.list.d/matrixlabs.list
sudo apt-get update
sudo apt-get upgrade
sudo reboot

2. To Install the Matrix Kernel modules. Use the command below

sudo apt install matrixio-kernel-modules

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This allows the microphones on your matrix device to register as an ALSA microphone on your Raspberry Pi.

sudo reboot

3. Next command will test your microphones by raising your output volume, creating a 5 second long audio recording, and then playing that recording.

Make sure you have select audio jack as output for that

sudo raspi-config

then blue screen appears, go to advanced option then go to audio and select analog jack.

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amixer set PCM 100% && arecord recording.wav -f S16_LE -r 16000 -d 5 && aplay recording.wav

If you are able to hear the audio then you are done.

Next we are going to install the SAM tool on desktop

II.Installing the SAM CLI tool on personal computer(Ubuntu)

We are using the SAM CLI tool to create, manage and deploy our Snips assistants, to configure hardware, to view the logs of assistants on the Raspberry Pi, as well as to run your application locally for quick prototyping.

1. Install SAM into your computer with the following command.

sudo npm install -g snips-sam

2. Installing through SAM

We are going to install on our Raspberry Pi, Snips will be installed through the SAM CLI tool from our personal computer.

sam devices 

This command should log all of the Raspberry Pis on your network with their IP address and host name.

Note:- sam devices not required if you already know your RPi IP address

Connect to your Raspberry Pi using command

sam connect ip address of Pi

eg :- sam connect

you'll then be prompted to insert a username and password of RPi.

Once you connected use the sudo init command, from your personal computer, to install Snips onto your Raspberry Pi.

sudo sam init

III. Configuring on Raspberry Pi

Now, edit the snips.toml file for configuring the mics on RPi.

Open terminal and use command to open the snips.toml file

sudo nano /etc/snips.toml

You can use any editor to do changes.

Scroll down to where you see [snips-audio-server] and replace

# mike = "Built-in Microphone"
with the following:
mike = "MATRIXIO SOUND: - (hw:2,0)"

IV.Testing onpersonal Computer(Ubuntu)

Through your personal computer's terminal, you can use SAM to test the speaker and microphone of your Raspberry Pi.

1. To Test Raspberry Pi's speaker

sam test speaker

2. To Test the microphones on your Matrix device

sam test microphone

If both commands seem to work, you've properly configured on your Raspberry Pi.

If there is some problem use this command

sam setup audio 

Then it will ask whether you are using snips kit or not (I choose no)

Then it will ask you to select the microphone. Here I am using Matrix Voice microphone

Then it will ask you to select the speaker. Here I am using RPi audio jack as speaker.

To test is properly working by installing a demo assistant for the weather or not.

sam install demo 

After installing as you see snips assistant is running.

Now, test the assistant by saying

"Hey Snips!" 
"What will the weather be like in Madagascar in two days?"

The response from Snips should be:

"You asked for the weather in Madagascar in two days."

Congratulations we have successfully installed Snips on RPi.

Control lights with

1. Creating a Snips assistant & app

Sign into your and create an assistant. After sign in you page will like this

2. Create a new assistant

3. Give name to an assistant, select language and then create it.Once created you will see page like this

4. Then click on add an app and you will see page like this

5. Select create a new app and give it a name whatever you want and create it

Once created you will see page like this

After that open the app and you will see page like this

6. Click on edit app. As you see I already created intent (lights). You will see no intent on your page.

7. Create a new intent

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After creating you will see page like this. My intent name is lights

8. Give training examples (you can give training examples after creating slots also). Training examples are given at the end.

9. Then create a new slots and give it name whatever you want. Here I am using four slots

  • switch for on, off, open, and close state
  • room for different rooms such as bedroom, bathroom etc
  • device for devices such as light, fan, door etc
  • brightness for setting brightness of light in different rooms.

10. Then give slot type name. Here I am building custom slot type.

  • For room slot

Give any name whatever you want.

After that add slot values "bathroom", "bedroom", "kitchen", and "main hall" etc.

  • For switch slot

Give any name whatever you want.

After that add slot values "on", "off", "open", and "close"

  • Device slot

Give any name whatever you want.

After that add slot values "light", "fan", and "door".

  • For brightness slot

Give any name whatever you want.

After that add slot values 75, 50, 25, 0

11. Close the app, in order to tell the training example which slot is used, double click on Off and On and select slot name(switch).

Double click on room name and select slot name(room).

Double click on light, fan and select slot name(device).

Double click on values(0, 25, 50) and select slot name(brightness).

Then save it and you can test it in window provided right hand side of the page.

Then deploy it

Connect SAM to Raspberry Pi on personal computer

1. From your computer's terminal, sign in through the Sam CLI Tool

sam login 

Login using your snips account

2. Connect to your Raspberry Pi. When prompted for a username & password, insert the Raspberry Pi credentials.

sam connect YOUR.PI.IP.HERE

3. Copy the command and paste on your local computer.

After deploying on your Pi you will see like this

Creating an assistant on Raspberry Pi

Assistant will be used to listen and respond to events from your Snips assistant

1. go to the directory which we made during JavaScript setup in Matrix core and create 4 new JavaScript files.

cd ~/js-matrix-core-app
touch assistant.js pwm.js everloop.js func.js

2. Install MQTT to listen in on events from Snips.

npm install mqtt --save

3. Open everloop.js using any editor and paste the code given in program. Code is used to control the LED's on the Matrix Voice.

4. Open pwm.js using any editor and paste the code given in program. It is used to turn the lights on/off, set lights brightness and open/close door.

5. Open assistant.js using any editor and paste the code given in program. It combines all the code from everloop.js & pwm.js to control the everloop and relay switch through voice.

var snipsUserName = 'ruchir'; // username of snips account
var lightState = 'hermes/intent/'+snipsUserName+':lightState'; // name of intent you give while creating an intent


Intent name

Once done now it is time to check

Open your personal computer (Ubuntu) terminal and run

sam watch

On the other hand, open RPi terminal and go to the directory

cd js-matrix-core-app/
node assistant.js  // run it 

Now say "Hey snips!"

then say "turn on light" you will see light will be on and vice versa

  • turn on the bedroom light
  • turn on the kitchen light
  • turn off the bathroom light


A relay is an electromagnetic device which is used to isolate two circuits electrically and connect them magnetically. They are very useful devices and allow one circuit to switch another one while they are completely separate. They are often used to interface an electronic circuit (working at a low voltage) to an electrical circuit which works at very high voltage. For example, a relay can make a 5V DC battery circuit to switch a 230V AC mains circuit.

How it works

A relay switch can be divided into two parts: input and output. The input section has a coil which generates magnetic field when a small voltage from an electronic circuit is applied to it. This voltage is called the operating voltage. Commonly used relays are available in different configuration of operating voltages like 6V, 9V, 12V, 24V etc. The output section consists of contactors which connect or disconnect mechanically. In a basic relay there are three contactors: normally open (NO), normally closed (NC) and common (COM). At no input state, the COM is connected to NC. When the operating voltage is applied the relay coil gets energized and the COM changes contact to NO. By using proper combination of contactors, the electrical circuit can be switched on and off.

The COM terminal is the common terminal. If the COIL terminals are energized with the rated voltage, the COM and the NO terminals have continuity. If the COIL terminals are not energized, then the COM and the NO terminals have no continuity.

The NC terminal is the Normally Closed terminal. It is the terminal that can be powered on even if the relay doesn't receive any or sufficient voltage to operate.

The NO terminal is the Normally Open terminal. It is the terminal where you place the output that you want on when the relay receives its rated voltage. If there is no voltage to the COIL terminals or insufficient voltage, the output is open and receives no voltage. When the COIL terminals receive the rated voltage or a little under, the NO terminal receives sufficient voltage and can turn on the device on the output.


Relay ==> Matrix Voice

5V ==> 5V


Signal1 ==> GPIO0 (DF0)

Signal2 ==> GPIO1 (DF1)

Signal3 ==> GPIO2 (DF2)

Signal4 ==> GPIO3 (DF3)

Signal5 ==> GPIO5 (DF5)

signal6 ==> GPIO11 (DF11)

Servo Motor ==> Matrix Voice

5V ==> 5V


Signal ==> GPIO10(DF10)


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Training examples

turn on bathroom light

turn on the kitchen lights

turn off the bedroom lights

turn on all the light

set bathroom light intensity to 25 percent

set kitchen light intensity to 75 percent

set bedroom light intensity to 50 percent

set bedroom light intensity to 0 percent

open the main hall door

close the main hall door


I made a page for showing the logs (room, devices, device state, intensity value and date) and gauge showing current intensity value so that I can know which command I used while talking to the snips. Follow the steps giving below for making a webpage.

Note - You can use either Node server or Apache server.

In this project I am using node server as Apache server is slow and it was not able to update data correctly.

Note - If you use code given in this project make sure your all the data is in cd /var/www/html directory or you can change location in the program.

First, to install Apache server using command (Not required)

sudo apt-get install apache2

Apache server is not required if you have node server


Node server

Make an empty file name server.js, add program given below and save it.

To run server use command

node server.js 

Next, go to the directory cd /var/www/html and make two folders

1. Make a folder name js using command

mkdir js
cd js // go to the directory

In /var/www/html/js directory make a file name angular.min.js and paste data from the link given below


In same directory make another file name gauge.min.js and paste data from the link given below


2. Make a folder name jsonpage using command

mkdir jsonpage
cd jsonpage

In jsonpage directory make a file name info.js. Make it empty

Note:- Json file will be cleared after 50 voice commands

Login page

For making login page go to the directory cd /var/www/html and make an empty file name index.html. Add program given below

Main page

For making main page go to the directory cd /var/www/html and make an empty file name HA.html(any). Add program given below

For making gauge make a empty file name index.js in cd /var/www/html directory. Program is given below.

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For sending mail install node package

npm install nodemailer

Npm package for bidirectional event-based communication

npm install 

Npm package for express

npm install express 

If you want to hear the words. You can download this node package.

npm install say 

Add these lines in program (example)

const say = require('say')
say.speak('Brightness is set to 75');

In short required folder and files

1. For login page make a file index.html in cd /var/www/html

2. In /var/www/html/js folder there are 10 files angular.min.js , gauge.min.js and some more. You can download the files given below

required files

3. For making gauge make a file name index.js in cd /var/www/html

4. In var/www/html/jsonpage folder we have info.json file in which we receive data from voice commands

5. For showing logs and gauge on page make a file name HA.html in cd /var/www/html.

6. Make a file server.js in cd /var/www/html directory.

Now, we are done with all the setup.

Next, Open shell and run

cd js-matrix-core-app 
node assistant.js

Open another shell and run

cd /var/www/html
node server.js 

Open browser



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Note:- Supported browser Firefox and Chromium browser

Email notification after login

If you want to test the program without webpage. You can download the code


Special thanks to Aditya Bhardwaj

Schematics and circuit diagrams







Dummy code



Dummy code




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