Posts: 2
Joined: Fri Nov 23, 2018 3:21 pm

Can't handle backlight on Chalkboard touchscreen

Fri Nov 23, 2018 4:09 pm

Hi everybody, I just installed Raspbian on a Raspberry Pi 3 B+, and connected it to the 10" Chalkboard multitouch LCD [https://www.chalk-elec.com/?page_id=128 ... ry=3094861].

In order to properly manage backlight I updated the firmware to the last version available (the one with the multitouch feature) and tried to install the LCD control GUI, as suggested here → https://www.chalk-elec.com/?p=2144.

The Chalckboard page (2nd link) says that "The simplest way to communicate with HID devices is to to use cross-platform library HIDAPI from Signal11. "

This is the link to Signal11's github↓

I followed the instructions to install it:

Code: Select all

make install 
but nothing happens.

Then I noticed that the folders available here → https://drive.google.com/drive/folders/ ... jQ1QmVoR0U look similar to the one from github and I wonder if I had to merge them in some way.

Now my backlight is sat to minimum (default setting) and I still can't do anything to control it.

Did I miss something? If so, what's the proper way to install the LCD backlight control?

Thanks in advance,


Posts: 1275
Joined: Tue Jun 30, 2015 1:35 pm

Re: Can't handle backlight on Chalkboard touchscreen

Sat Nov 24, 2018 6:19 am

Why don't you ask the supplier/manufacturer for support?
Only persons which have this particular product might be able to help. But don't know if some of them are here ...

Posts: 2
Joined: Fri Nov 23, 2018 3:21 pm

Re: Can't handle backlight on Chalkboard touchscreen

Mon Dec 03, 2018 4:22 pm

Sorry for my delay in answering. I wrote to Chalkboard and they didn't say anything useful except that I should use HID commands.

Then I wonder what is the tarball provided for.

I can't understand, so there's nothing to install?
If so, is there anyone with some HID commands experience to address me in the right way to understand them?

Return to “Interfacing (DSI, CSI, I2C, etc.)”