diegofn / rpi-bt-lightcontroller

rpi-bt-lightcontroller

RaspberryPi light controller using bluetooth. It was tested in RaspberryPi ZeroW.

Requirements

On raspbian or raspberryos, install the required python bluetooth, bluez firmaware, bluetooth and GPIO python libraries:

$ sudo apt update
$ sudo apt upgrade
$ sudo apt install bluetooth bluez
$ sudo apt install python-bluetooth
$ sudo apt install python-rpi.gpio

Install the bluetooth python packages

$ pip3 install PyBluez

Enable the serial port in bluetooth.

$ sudo vi /etc/systemd/system/dbus-org.bluez.service

Add the compatibily -C flag and the SP profile

ExecStart=/usr/lib/bluetooth/bluetoothd -C
ExecStartPost=/usr/bin/sdptool add SP

Grant the pi user to use bluetooth service

$ sudo adduser pi bluetooth
$ sudo reboot

Setup bluetooth

1. Check the bluetooth service

$ bluetoothctl -v
$ sudo systemctl status blueto*

2. Open the bluethoothctl utility

$ bluetoothctl

[bluetooth]# power on
[bluetooth]# agent on
[bluetooth]# discoverable on
[bluetooth]# pairable on
[bluetooth]# scan on

3. Please pair your raspberrypi with your smartphone.

Android Bluetooth client

You can use the following Android Client to test the light control https://github.com/diegofn/BTLightController

or test it with a bluetooth chatbot controller using https://play.google.com/store/apps/details?id=com.electrotoolbox.bluetoothterminal

Install as a service - Optional

You can configure the light controller to start the python script as a daemon service.

1. Change the ExecStart and WorkingDirectory in the light_controller.service file

2. Run the following commands to copy the service file to filesystem daemon folder.

$ sudo cp light_controller.service /etc/systemd/system
$ sudo systemctl enable light_controller
$ sudo systemctl start light_controller
$ sudo systemctl status light_controller

3. Restart the system and check if the the script is running

Updating blueZ - Optional

Some rasperrypios distribution does not support a bluetooth serial interface, you need to update the BlueZ with the following commands

$ mkdir ~/Documents/bluez
$ cd ~/Documents/bluez
$ sudo apt update
$ sudo apt install libdbus-1-dev libglib2.0-dev libudev-dev libical-dev libreadline-dev
$ curl -L https://www.kernel.org/pub/linux/bluetooth/bluez-5.55.tar.gz > bluez-5.55.tar.gz
$ tar -zxvf bluez-5.55.tar.gz 
$ cd bluez-5.55/
$ ./configure --prefix=/usr --mandir=/usr/share/man --sysconfdir=/etc --localstatedir=/var --enable-experimental
$ sudo make install

Change the BlueZ policy

$ sudo cp /etc/dbus-1/system.d/bluetooth.conf /etc/dbus-1/system.d/bluetooth.conf.bak
$ sudo vi /etc/dbus-1/system.d/bluetooth.conf

Add the following lines

...
  <policy user="root">
    <allow own="org.bluez"/>
    <allow send_destination="org.bluez"/>
    <allow send_interface="org.bluez.Agent1"/>
    ...
    <allow send_interface="org.bluez.ThermometerWatcher1"/>
    <allow send_interface="org.bluez.HeartRateWatcher1"/>
    <allow send_interface="org.bluez.CyclingSpeedWatcher1"/>
    ...
  </policy>

  <!-- allow users of bluetooth group to communicate -->
  <policy group="bluetooth">
    <allow send_destination="org.bluez"/>
  </policy>
  ...