Hardware Prerequisites

Before getting started, you can check with more details what hardware I used:

• Raspberry Pi 3 B+
• MATRIX Creator ,first steps, and datasheet,  and you can buy a MATRIX Creator board here
• Micro-USB power adapter
• Micro SD Card (16 GB & class 10 speed)
• Micro-USB Cable
• USB Keyboard & Mouse & HDMI Monitor
• Internet connection
• A diymore Black ROT3U 6DOF Aluminum robotic arm (maximum extension: 45 cm) and six servos MG995 (Stall torque: 8.5 kgf·cm with 4.8 V, 10 kgf·cm with 6 V) dataseeht here

Software Prerequisites

You can check what required software on my personal computer I used:

• SD Card Formatter: To easily format our Micro SD Card
• balenaEtcher: To easily flash our compressed Raspbian Stretch image
• MATRIX kit image here which includes Stretch + MATRIX packages (2.18 GB)
• Node.js: Dependancy for Sam CLI Tool (Windows 64 bits)
• Git Bash: requirement asked by Node.js
• Snips' Sam CLI Tool: Creates & manages Snip assistants on your Raspberry Pi

Setting Up the Hardware

• First at all, You need a registered snips.ai account.
• Be sure to setup your Raspberry Pi with your MATRIX Creator device.
• Enable SSH on your Raspberry Pi. This allows the SAM CLI tool to connect to your Raspberry Pi board
• Install MATRIX Lite JS. This allows Snips to work on you Raspberry Pi board
• Configure Snips.ai

Once everything is well installed on your Raspberry Pi board, You can check the versions of: npm, node and nodejs.

In my case, I had two serious problems with the configuration of my hardware and these are the solutions:

FIRST SOLUTION: to activate the pcm.speaker, I had to add a rate of 16000 in the assound.conf file.

pcm.speaker {
type plug
slave {
pcm "hw:0,0"
rate 16000
}
}

SECOND SOLUTION: My Raspberry Pi board has better audio with the "portaudio" board, so I had to activate it in the snips.toml file

[snips-audio-server]
# frame = 256
# bind = "default@mqtt"
mike = "MATRIXIO-SOUND: - (hw:2,0)"
# disable_playback = false
# disable_capture = false
portaudio_playback="default"