Waveshare Magic Mirror touch screen

MM-Hans

Maybe I don’t understand you well, but it’s a one-way mirror over a touchscreen. I believe this monitor is also sold without the mirror. There is some space between the mirror and the display. I have not yet used the touch function because I will not be able to continue until I have an answer from Waveshare support.

aprilmaccydee

Just got one of these today, kinda happy with it, especially as a bit of a beginner system!

FYI - if you want to programmatically change the brightness (as I’m seeing in older posts):

CAUTION - This worked for me, but involves enabling scary flags and setting potentially unsafe values to the monitor. Exercise caution.

Edit vi /boot/config.txt
Add:

dtparam=i2c2_iknowwhatimdoing

Reboot

Then sudo apt-get install ddcutil

Run sudo ddcutil detect
You should see an output like:

pi@raspberrypi:~ $ sudo ddcutil detect
Display 1
   I2C bus:             /dev/i2c-2
   EDID synopsis:
      Mfg id:           RTK
      Model:            RTK FHD
      Serial number:    [redacted]
      Manufacture year: 2011
      EDID version:     1.3
   VCP version:         2.2

If you do, you can then run:
sudo ddcutil getvcp 10 to get the brightness
and
sudo ddcutil setvcp 10 [1-100] to set the brightness, where 1-100 is the desired value of the brightness

jrettsch

@aprilmaccydee

Thanks for this example! I got the Waveshare Magic Mirror a few days ago and was looking for a solution to dim the backlight.

I’m using xscreensaver to blank the screen after 2 minutes and used the ddcutil command to dim the backlight.

Here is the script I’m using:

#!/bin/sh
process() {
        while read line; do
                case "$line" in
                        UNBLANK*)
                                sudo ddcutil setvcp 10  100
                        ;;
                        BLANK*)
                                sudo ddcutil setvcp 10  1
                        ;;
                esac
        done
}

xscreensaver-command -watch | process

I use xscreensaver-command -watch to get the state changes, see https://www.jwz.org/xscreensaver/man3.html