I have often been annoyed that to project PowerPoint, Word or PDF files I always have to carry a notebook PC with me, where I only open the file and navigate with the arrow keys in PowerPoint. For this purpose, is there an extremely compact computer with only navigation buttons and without its own display (Linux or even more primitive), in which you can only insert a USB stick and connect it to a projector via VGA or HDMI?
Of course, you can take a raspi there. Some even install the Raspi Zero in a gaming mouse, and then present only with the mouse (to which a power supply and an HDMI cable hang, however).
This one also attached a small screen to the mouse.
There are various PCs in USB stick format. You would then have to connect a mouse or keyboard. https://www.vergleich.org/pc-stick/
But there are also USB / HDMI adapters with which you can connect a cell phone or tablet to the projector, provided your cell phone supports HDMI.
Thanks for the tip. Is there a VGA output? Sometimes you have older projectors without HDMI
There are various adapters. For example here
