RaspiCast is a pretty cool tool to cast videos to your Raspberry Pi/Retro LED beamer. It is rather simple: there is an Android app that sshs into your Pi and controls omxiv. Pretty simple, pretty good. 

cd ~

git clone https://github.com/HaarigerHarald/omxiv

cd omxiv

make ilclient

make -j4

sudo make install

 Setup your RaspiCast app on the mobile phone. You have to enter the hostname/IP (somehow hostname was not working stable here) and your credentials.

Your Raspberry Pi will always return to the desktop between your videos.

To display the temperature not only on the small LCD display but on your Beamer, you can use conky.

Ssh into your Pi and run

sudo apt-get install conky

 Copy the .conkyrc file to your /home/pi folder and the getTemperature_conky-percentage.sh and getTemperature_conky.sh to /home/pi/opt.

Copy conky.desktop to /etc/xdg/autostart.

chmod +x /home/pi/opt/*

 to make all your files executable.

Restart your Pi to get the temperature displayed to the screen.

The lower right should show you a histogram, but it's unreadable at the moment. Maybe I'll correct .conkyrc somewhen.