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A Python module for controlling power and brightness of the official Raspberry Pi 7" touch display.

Project description

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A Python module for controlling power and brightness of the official Raspberry Pi 7” touch display.

Example

Features

  • Change the display brightness smoothly or abrupt
  • Set the display power on or off
  • Get the current brightness
  • Get the maximum brightness
  • Get the display power state (on/off)
  • Command line interface
  • Graphical user interface

Requirements

  • A Raspberry Pi including a correctly assembled 7” touch display v1.1 or higher running a Linux-based OS
  • Python 2 or 3
  • Optional: pygobject for the GUI, is likely to be already installed on a recent Raspbian

Installation

  • Install from PyPI using:

    pip install rpi_backlight
    
  • or clone this repository and install by:

    git clone https://github.com/linusg/rpi-backlight.git
    cd rpi-backlight
    sudo python3 setup.py install
    

Note: You may need to edit the backlight rules file in order to run the code:

sudo nano /etc/udev/rules.d/backlight-permissions.rules

Insert the line:

SUBSYSTEM=="backlight",RUN+="/bin/chmod 666 /sys/class/backlight/%k/brightness /sys/class/backlight/%k/bl_power"

Usage

API

Example in a Python shell:

>>> import rpi_backlight as bl
>>> bl.set_brightness(255)
>>> bl.set_brightness(20, smooth=True, duration=3)
>>> bl.get_max_brightness()
255
>>> bl.get_actual_brightness()
20
>>> bl.get_power()
True
>>> bl.set_power(False)

NOTE: Code using set_ functions of this library has to be run as root, e.g. sudo python file.py , if the permissions for changing the backlight were not changed as described in the installation section!

CLI

Open a terminal and run rpi-backlight as root:

$ rpi-backlight -b 255
$ rpi-backlight -b 20 -s -d 3
$ rpi-backlight --max-brightness
255
$ rpi-backlight --actual-brightness
20
$ rpi-backlight --power
True
$ rpi-backlight --off

GUI

Open a terminal and run rpi-backlight-gui as root.

Graphical User Interface

Todo

Yay, this list is currently empty! Feel free to add ideas here.

License

The source code and all other files in this repository are licensed under the MIT license, so you can easily use it in your own projects.

Project details


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