Internet-Radio for Raspberry Pi OS based on MPD

Features

• receives radio streams from internet and plays them
• Can switch between predefined internet stations
• Displays current internet station + Infos from the stream
• Allows to increase/decrease the volume via rotary switch
• Allows to switch the channel via rotary switch
• Can be turned off/on via button
• Remembers last station and volume value
• Can be controlled via smartphone app

Planned features

• Allows CRUD for Internet Stations+Stream URLS
• Shows a status light while running

Setup

Hardware Prerequisites

• Raspberry Pi 2 Model B Rev 1.1
• Hifiberry Amp2
• 3 Speaker
• 3-Way Speaker Crossover
• 2 Rotary Encoder with push button

Software Prerequisites

• Raspberry Pi OS Lite (https://www.raspberrypi.org/downloads/raspberry-pi-os/)
• MPD (https://www.musicpd.org/)
• MPC (https://www.musicpd.org/clients/mpc/)
• Google Speech for Python (https://pypi.org/project/google-speech/)
• GPIOZero (https://gpiozero.readthedocs.io/en/stable/)
• SSH to connect remotely connect to Raspi

Install

1. Download Raspberry Pi OS and install on SD card
2. Boot and config Raspberry Pi Os via sudo raspi-cofig to basic config:
   • Change password
   • Change keyboard layout
   • Change Wifi
   • Enable SSH
3. Connect via SSH to raspi , i.e. via ssh pi@hostname
4. Configure Audio Hardware (see https://www.hifiberry.com/docs/software/configuring-linux-3-18-x/)

   sudo nano /boot/config.txt
   sudo nano /etc/asound.conf
   sudo reboot

   After succesfull activation the audio hardware should be detected as shown in

   pi@raspberrypi:~ $ aplay -l
   **** List of PLAYBACK Hardware Devices ****
   card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ HiFi pcm512x-hifi-0 [HiFiBerry DAC+ HiFi pcm512x-hifi-0]
   Subdevices: 1/1
   Subdevice #0: subdevice #0

5. Install MPD and verify that it is started

   sudo apt update
   sudo apt upgrade
   sudo apt install mpd
   sudo service mpd start

   Find out the current alsa audio hardware device and mixer index. The mixer control for an AMP2 is always "Digital" (see https://www.hifiberry.com/docs/archive/mixer-controls-on-the-hifiberry-boards/)

   aplay -l
   aplay -L

   and configure it in the /etc/mpd.conf file with additional block

   audio_output {
           type            "alsa"
           name            "HifiBerry Amp2 Device"
           device          "hw:CARD=sndrpihifiberry,DEV=0"
           mixer_type      "hardware"      
           mixer_device    "default"       
           mixer_control   "Digital"      
           mixer_index     "0"     
   }       

• Install MPC and verify that it is working

  sudo apt install mpc
  mpc load http://streams.fluxfm.de/live/mp3-320/audio/play.m3u
  mpc play

  Hint: radio station urls can be found via WEB API https://de1.api.radio-browser.info/json/stations/byname/{stationName} quite easily

• Install Python 3, Pip + 3rd party libraries

  python3 --version
  sudo apt install python3-pip
  sudo apt install python3-gpiozero
  pip3 install google_speech
  sudo apt install sox libsox-fmt-mp3

• Install Script and Setup Deamon Process

  nano /home/pi/.local/bin/radio
  chmod +x radio

  Create a service deamon /etc/systemd/system/radio.service

• Install Android App