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  1. #1
    Soundwave
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    Question Control backlight programmatically

    We are considering using that TF300 for science research, but I will need to programmatically control the screen/backlight. Specifically, there is a mode where I'll want to communicate with other systems via WiFi, play sounds, and have the touchscreen active, but the backlight off; in this mode, the device cannot emit any light, or it will interfere with the science. Is this feasible? I plan to use the Android SDK, by the way...

    Thanks for your advice!
    Bob

  2. #2
    Transformer Forums Legend
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    Welcome to the forum Bob,

    As far as I know it is not possible to turn the backlight completely off without putting the tablet to sleep, which would disable the keyboard. It can get pretty dim, but not off.

  3. #3
    Soundwave
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    Ugh! Is that true of the other models too? Too bad if so - that's a hard requirement.

  4. #4
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    Quote Originally Posted by RSG View Post
    Ugh! Is that true of the other models too? Too bad if so - that's a hard requirement.
    I'm pretty certain that if the screen is black, no backlight, it won't work and that pretty much applies to any of the Android tablets. In some configurations you can operate with a blank screen if you have it connected by HDMI to another device but it just moves the light to another device. However you could kill the light on that device, a TV for instance, but then you can't see what you're doing. Unless I missed something.

  5. #5
    Bumblebee
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    If you are using SDK you could just use the command line for most things in an ADB shell and leave the screen on sleep. I'm pretty sure that would work, but not for sure as I've never tried it...
    TF101! - Running Domination built on my beautiful ArchLinux box!
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  6. #6
    Soundwave
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    Hmm... That sounds maybe promising - maybe... Any idea how I can find out, short of buying one and trying it? (Typical research lab - not a lot of money to play around with!) Think I'll try to ask Asus - wish me luck there...

  7. #7
    Bumblebee
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    Short of getting your hands on a tablet, I'm not sure how you can find out. If you tell me a little bit about what you are doing, I may be able to try some commands on my TF101 and see if the screen stays off while stuff is running etc...
    TF101! - Running Domination built on my beautiful ArchLinux box!
    Samsung Galaxy S4 - Stock Sadly...
    Custom Built Desktop - Intel I7 w/ Windows7 & ArchLinux Dual boot - Go LINUX!
    I firmly believe that any man's finest hour, the greatest fulfillment of all that he holds dear, is that moment when he has worked his heart out in a good cause and lies exhausted on the field of battle - victorious. - Vince Lombardi

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  8. #8
    Soundwave
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    Well, that sure would be nice of you! Basically, I need to write software that interacts with the user and communicates with another system over WiFi. At some point, I need to turn the backlight off so there is no light - the room with be otherwise dark - but my software still needs to communicate over wifi, continue playing sound, and respond to touch, to exit that mode.

    If that scenario is easy enough to check and you feel like doing it, that would be great! ;-) I don't know, can you maybe have it play some music, then run a script or something that turns off the backlight; if the music keeps playing, that's probably sufficient as a proof of concept. Not asking you do waste your life on my problem, so don't lose any sleep on it!

  9. #9
    Bumblebee
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    I will see if I can run some adb shell commands to start music and not have the screen come on at all if possible. I will try to let you know something by monday.
    TF101! - Running Domination built on my beautiful ArchLinux box!
    Samsung Galaxy S4 - Stock Sadly...
    Custom Built Desktop - Intel I7 w/ Windows7 & ArchLinux Dual boot - Go LINUX!
    I firmly believe that any man's finest hour, the greatest fulfillment of all that he holds dear, is that moment when he has worked his heart out in a good cause and lies exhausted on the field of battle - victorious. - Vince Lombardi

    Great Help Guide Here -> Frederucos Fantastical Forum Favorites
    And Here -> Master Help Guide

  10. #10
    Soundwave
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    Red face

    Quote Originally Posted by bfmetcalf View Post
    I will see if I can run some adb shell commands to start music and not have the screen come on at all if possible. I will try to let you know something by monday.
    Thanks, I greatly appreciate that!

 

 
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