BackLight Unit coNTRoL

• Windows

  
  Filmed with a Canon EOS 450D and EOS Camera Movie Record

  An ordinary webcam as an ambient light sensor to control the BLUs of all attached monitors. Easier for the eyes and the environment!

  Prerequisites

  • Hardware
    • MCCS capable monitor (find out with Monitor Asset Manager) or a notebook supported by NirCmd. Examples:

      Brand	Model	MCCS compliance
      Benq	G2020HD	2.0
      	G2400W	2.0
      Dell	2000FP	-
      	2001FP	-
      Green House	GH-USD16	-
      HP	LP2465	yes
      	LP3065 Revision GSZ001	2.1
      	LP3065 Revision GSZ002	2.0 (unstable)
      	w2558hc	yes
      	zr24w	yes
      	Z27q 5K	2.2
      LG	24UD58-B	yes
      	W2252TE	yes
      marantz	SR6012	-
      Samsung	226BW	yes
      	244T	0.1
      	275T	yes
      	LD220	-
      	S22B150	2.0
      	SA650	2.0
      Toshiba	37XV501P	-

    • Optional
      • DirectShow compatible webcam
      • Mouse wheel; works nice with the free-spinning Logitech MicroGear.
  • Software
    • Windows Vista or later
    • Binary (requires Microsoft Visual C++ 2010 Redistributable Package (x86))
    • The windows can be hidden with Hide-It.
    • Source code
      • Visual C++ project on github. Required libraries:
        • videoInput
        • GLFW 2

  Keys in cam window

  S	Configure camera
  R	Restart camera
  Q	Stop camera
  ESC	Quit
  Scroll wheel	Shift control range

  Command line parameters

  BLUntrl [ VfWDeviceNo | ( MonitorNo|MonitorName(-1=all) Brightness(0-100%) ) ]

  Examples

  BLUntrl	Use cam 0
  BLUntrl 1	Use cam 1
  BLUntrl 0 0	Set first monitor to lowest brightness
  BLUntrl "HP Z27q IPS 5k Display" 100	Set Z27q to full brightness
  BLUntrl -1 100	Set all monitors and the notebook panel to full brightness

  Possible improvements

  • Keys 1-9, +, - to shift control range
  • Separation of acquisition and control
  • Integration with f.lux

  Changelog

  2009	First release
  08.06.2010	Command line parameter
  22.07.2010	Command line parameters
  11.12.2011	Increased update interval to 0.5 s
  30.03.2012	Fixed window minimization
  13.12.2016	Monitor name; nircmd SetBrightness started for -1 if in %PATH% or current directory

• macOS

  Screen content based
  CABLUntrl.zip

• Linux

  Window caption based
  Prerequisites
  • Devilspie2 0.43
  • Software
    • /etc/udev/rules.d/90-backlight.rules
    • ~/.config/devilspie2/devilspie2.lua
    • ~/.config/devilspie2/BLUntrl.lua