目录

树莓派4

硬件概述

烧录系统

wget https://downloads.raspberrypi.org/rpd_x86/images/rpd_x86-2021-01-12/2021-01-11-raspios-buster-i386.iso
dd if=2021-01-11-raspios-buster-i386.iso of=/dev/sdc bs=10M

ReSpeaker 2-Mics Pi HAT

ReSpeaker 2-Mics Pi HAT是专为AI和语音应用设计的Raspberry Pi双麦克风扩展板。 这意味着您可以构建一个集成Amazona语音服务等的功能更强大，更灵活的语音产品。

该板是基于WM8960开发的低功耗立体声编解码器。 电路板两侧有两个麦克风采集声音，还提供3个APA102 RGB LED，1个用户按钮和2个板载Grove接口，用于扩展应用程序。 此外，3.5mm音频插孔或JST 2.0扬声器输出均可用于音频输出。

硬件概述

产品特征

配置

$ sudo raspi-config

打开 I2C

  • 3 Interface Options Configure connections to peripherals
  • P5 I2C Enable/disable automatic loading of I2C kernel module
  • Yes

安装 ReSpeaker 驱动

git clone https://github.com/respeaker/seeed-voicecard
cd seeed-voicecard/
sudo ./install.sh --compat-kernel
sudo ./install.sh 2mic --compat-kernel
reboot

查看 ALSA 声卡

  • arecord 
    arecord -l

    **** List of CAPTURE Hardware Devices ****
card 2: seeed2micvoicec [seeed-2mic-voicecard], device 0: bcm2835-i2s-wm8960-hifi wm8960-hifi-0 [bcm2835-i2s-wm8960-hifi wm8960-hifi-0]
Subdevices: 1/1
Subdevice #0: subdevice #0
  • aplay 
    aplay -l

    **** List of PLAYBACK Hardware Devices ****
card 0: b1 [bcm2835 HDMI 1], device 0: bcm2835 HDMI 1 [bcm2835 HDMI 1]
Subdevices: 4/4
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
card 1: Headphones [bcm2835 Headphones], device 0: bcm2835 Headphones [bcm2835 Headphones]
Subdevices: 4/4
Subdevice #0: subdevice #0
Subdevice #1: subdevice #1
Subdevice #2: subdevice #2
Subdevice #3: subdevice #3
card 2: seeed2micvoicec [seeed-2mic-voicecard], device 0: bcm2835-i2s-wm8960-hifi wm8960-hifi-0 [bcm2835-i2s-wm8960-hifi wm8960-hifi-0]
Subdevices: 1/1
Subdevice #0: subdevice #0

调节音量

$ alsamixer

使用硬件

录制声音并播放

$ arecord -f cd -Dhw:2 | aplay -Dhw:2

录制 5 秒的声音文件

$ arecord -d 5 test.wav

播放声音文件

$ aplay -Dhw:2 test.wav

BUTTON 按钮

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
BTN_PIN=17

def pushed_button(channel):
    print('pushed button: ', channel)

GPIO.setup(BTN_PIN, GPIO.IN)
GPIO.add_event_detect(BTN_PIN, GPIO.FALLING, callback=pushed_button, bouncetime=50)

while True:
    time.sleep(10)

APA102 LED

打开SPI

  • 自动 
    sudo raspi-config nonint do_spi 0
  • 手动 
    $ sudo raspi-config
    • 3 Interface Options Configure connections to peripherals
    • P4 SPI Enable/disable automatic loading of SPI kernel module
    • Yes

运行示例

$ git clone https://github.com/respeaker/mic_hat.git
$ cd mic_hat/
$ python pixels.py

参考资料