tommccallum/smartbot

Uses Raspberry Pi to stream music via wifi and play via bluetooth speaker

Personal assistant

What to do if coming to this project for the first time, or back after a long hiatus...

Technologies

• Raspberry Pi
• Bluetooth Speaker

Software

• Python 3

sudo apt install libbluetooth-dev
pip install pybluez

• get_iplayer -- https://github.com/get-iplayer/get_iplayer
• festvox -- http://festvox.org/festival/index.html -- https://wiki.archlinux.org/index.php/Festival#Manually
• mplayer -- http://www.mplayerhq.hu/DOCS/tech/slave.txt
• m3u for playlists -- https://en.wikipedia.org/wiki/M3U
• schedule for python -- https://github.com/dbader/schedule
• Apache2
• PHP 7 (libapache2-mod-php)

Techniques

• Uses a FIFO file to communicate with mplayer instance to allow pause and plan

Similar projects

Text to Speech

• http://festvox.org/festival/index.html
• https://github.com/mozilla/TTS/tree/dev

Architecture

• User Context manages the current operation of the bluetooth speaker
• Each state adds sets of abilities to the User Context Queue
• When each state has been loaded, it then calls UserContext.execute, which will then run each ability in turn

Permissions

• Add user to the following: -- lp -- bluetooth -- www-data

PulseAudio

• add the following to /etc/pulse/default.pa

load-module module-switch-on-connect

Note that I did this and was getting the following errors:

Jun 18 19:38:16 april bluetoothd[294]: Unable to get connect data for Headset Voice gateway: getpeername: Transport endpoint is not connected (107)
Jun 18 19:38:16 april bluetoothd[294]: connect error: Connection refused (111)
Jun 18 19:38:18 april bluetoothd[294]: connect error: Connection refused (111)

I removed the line, removed the device and re-paired.

• install bluez for bluetooth
• install python-gobject
• pactl load-module module-bluetooth-discover
• check /var/log/syslog if you get errors when trying to connect to bluetooth

Use this command to follow the system log as its connects:

journalctl --follow

Bluetooth

• use bluetoothctl manually first to check connectivity

$ sudo bluetoothctl
> scan on
# wait for device to be detected
> trust XXX
> pair XXX
> connect XXX

Updatable programs.txt

sudo mkdir /opt/smartbot
sudo chown pi:www-data /opt/smartbot
sudo chmod g+ws /opt/smartbot
cp get_iplayer/programs.txt /opt/smartbot

Sensing distance

• https://www.raspberrypi.org/forums/viewtopic.php?t=47466
• can see bluetooth le devices with this, but cannot get rssi

sudo hcitool lescan --passive
``
- this works once connected

sudo hcitool rssi

- https://www.quora.com/How-do-I-calculate-distance-in-meters-km-yards-from-rssi-values-in-dBm-of-BLE-in-android
Installation instructions for R-Pi from clean Raspbian lite image

* assumes connected to internet

- Dependencies
$ sudo apt update
$ sudo apt upgrade
$ sudo apt install python-pip3 pulseaudio git mplayer apache2 php
$ pip3 install schedule evdev

- Download
$ git clone https://github.com/tommccallum/BluetoothMusicPlayer

- Install get_iplayer
$ git clone https://github.com/get-iplayer/get_iplayer
$ sudo perl -MCPAN -e shell
> install HTML::Entities
> install HTTP::Cookies
> install LWP::ConnCache


- Setup
$ mkdir -p $HOME/Radio/tmp
$ mkdir -p $HOME/Radio/keep

- Installation
$ cd BluetoothMusicPlayer
$ check_dependencies.sh
$ ./install_festival_voices.sh
$ cp scheduled/* /etc/cron.daily
$ ./retrieveChildrensProgrammes.sh

- Install Web Interface
$ sudo a2enmod cgi
$ ./install_web_interface.sh