Seeed studio ReSpeaker 2-Mics Pi HAT Bedienungsanleitung

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ReSpeaker 2-Mics Pi HAT

ReSpeaker 2-Mics Pi HAT is a dual-microphone expansion board for Raspberry Pi

designed for AI and voice applications. This means that you can build a more

powerful and exible voice product that integrates Amazon Alexa Voice Service,

Google Assistant, and so on.

The board is developed based on WM8960, a low power stereo codec. There are 2

microphones on both sides of the board for collecting sounds and it also provides 3

APA102 RGB LEDs, 1 User Button and 2 on-board Grove interfaces for expanding

your applications. What is more, 3.5mm Audio Jack or JST 2.0 Speaker Out are both

available for audio output.



3/4/2019 ReSpeaker 2-Mics Pi HAT - Seeed Wiki

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[https://www.seeedstudio.com/ReSpeaker-2-Mics-Pi-HAT-p-2874.html]

Features

Raspberry Pi compatible(Support Raspberry Pi Zero and Zero W, Raspberry Pi

B+, Raspberry Pi 2 B, Raspberry Pi 3 B, Raspberry Pi 3 B+ and Raspberry Pi 3 A+)

2 Microphones

2 Grove Interfaces

1 User Button

3.5mm Audio Jack

JST2.0 Speaker Out

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Max Sample Rate: 48Khz

Application Ideas

Voice Interaction Application

AI Assistant

Hardware Overview

BUTTON: a User Button, connected to GPIO17

MIC_Land MIC_R: 2 Microphones on both sides of the board

RGB LED: 3 APA102 RGB LEDs, connected to SPI interface

WM8960: a low power stereo codec

Raspberry Pi 40-Pin Headers: support Raspberry Pi Zero, Raspberry Pi 1 B+,

Raspberry Pi 2 B , Raspberry Pi 3 B and Raspberry Pi 3 B+

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POWER: Micro USB port for powering the ReSpeaker 2-Mics Pi HAT, please

power the board for providing enough current when using the speaker.

I2C: Grove I2C port, connected to I2C-1

GPIO12: Grove digital port, connected to GPIO12 & GPIO13

JST 2.0 SPEAKER OUT: for connecting speaker with JST 2.0 connector

3.5mm AUDIO JACK: for connecting headphone or speaker with 3.5mm Audio

Plug

Getting Started

1. Connect ReSpeaker 2-Mics Pi HAT to Raspberry Pi

Mount ReSpeaker 2-Mics Pi HAT on your Raspberry Pi, make sure that the pins are

properly aligned when stacking the ReSpeaker 2-Mics Pi HAT.

Raspberry Pi Connection

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Raspberry Pi zero Connection

2. Setup the driver on Raspberry Pi

While the upstream wm8960 codec is not currently supported by current Pi kernel

builds, upstream wm8960 has some bugs, we had xed it. We must build it

manually.

Make sure that you are running the lastest Raspbian Operating System(debian 9)

[https://www.raspberrypi.org/downloads/raspbian/] on your Pi. (updated at

2018.11.13)

Step 1. Get the seeed voice card source code, install and reboot.

sudo apt-get update

sudo apt-get upgrade

git clone https://github.com/respeaker/seeed-voicecard.git

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Step 2. Check that the sound card name matches the source code seeed-

voicecard by command aplay -l and arecord -l.

Step 3. Test, you will hear what you say to the microphones(don't forget to plug

in an earphone or a speaker):

3. Congure sound settings and adjust the volume with alsamixer

cd seeed-voicecard

sudo ./install.sh

reboot

pi@raspberrypi:~/seeed-voicecard $ aplay -l

**** List of PLAYBACK Hardware Devices ****

card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]

Subdevices: 8/8

Subdevice #0: subdevice #0

Subdevice #1: subdevice #1

Subdevice #2: subdevice #2

Subdevice #3: subdevice #3

Subdevice #4: subdevice #4

Subdevice #5: subdevice #5

Subdevice #6: subdevice #6

Subdevice #7: subdevice #7

card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 ALSA [bcm2835 IEC958

Subdevices: 1/1

Subdevice #0: subdevice #0

card 1: seeed2micvoicec [seeed-2mic-voicecard], device 0: bcm2835-i

Subdevices: 1/1

Subdevice #0: subdevice #0

pi@raspberrypi:~/seeed-voicecard $ arecord -l

**** List of CAPTURE Hardware Devices ****

card 1: seeed2micvoicec [seeed-2mic-voicecard], device 0: bcm2835-i

Subdevices: 1/1

Subdevice #0: subdevice #0

pi@raspberrypi:~/seeed-voicecard $

arecord -f cd -Dhw:1 | aplay -Dhw:1

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alsamixer is a graphical mixer program for the Advanced Linux Sound Architecture

(ALSA) that is used to congure sound settings and adjust the volume.

pi@raspberrypi:~ $ alsamixer

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The Left and right arrow keys are used to select the channel or device and the Up

and Down Arrows control the volume for the currently selected device. Quit the

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program with ALT+Q, or by hitting the Esc key. More information

[https://en.wikipedia.org/wiki/Alsamixer]

4. Use the on-board APA102 LEDs

Each on-board APA102 LED has an additional driver chip. The driver chip takes care

of receiving the desired color via its input lines, and then holding this color until a

new command is received.

5. How to use User Button

Warning

Please use the F6 to select seeed-2mic-voicecard device rst.



sudo pip install spidev

cd ~/

git clone https://github.com/respeaker/mic_hat.git

cd mic_hat

python pixels.py

0:00 / 0:11

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There is an on-board User Button, which is connected to GPIO17. Now we will try to

detect it with python and RPi.GPIO.

Save the code as button.py, then run it. It should display "on" when you press the

button:

Google Assistant SDK

To get started with Google Assistant(what is Google Assistant

[https://assistant.google.com/]), the rst is that you should integrate the Google

Assistant Library into your raspberry pi system. Here is the link to Google ocial

sudo pip install rpi.gpio // install RPi.GPIO library

nano button.py // copy the following code in button.py

import RPi.GPIO as GPIO

import time

BUTTON = 17

GPIO.setmode(GPIO.BCM)

GPIO.setup(BUTTON, GPIO.IN)

while True:

state = GPIO.input(BUTTON)

if state:

print("off")

else:

print("on")

time.sleep(1)

pi@raspberrypi:~ $ python button.py

off

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