What are some of the coolest Raspberry Pi projects that you've seen?

https://github.com/hoglet67/RGBtoHDMI

Up to 12 bits per pixel digital RGB, CGA/EGA/Amiga/other 8bit computers and some 8/16bit consoles, to HDMI converter. Written in bare metal ARM. Sampling pixels at 96MHz clock for pixel perfection.

https://stardot.org.uk/forums/viewtopic.php?f=3&t=14430

Depends on your definition of `cool'; here's a multi-zone Smart thermostat... https://joetruncale.medium.com/thermos-d089e1c4974b a smart cat flap... https://github.com/gerrito333/mousehunter-edge/blob/master/R... and a meteor detector! https://www.skyatnightmagazine.com/advice/diy/raspberry-pi-m...

I've been wanting to build a smart mirror like this for a while! https://magpi.raspberrypi.org/articles/build-a-magic-mirror

I came across this awhile back and thought it was a pretty cool project: https://youtu.be/_nBK8sAl9nw

Octoprint is pretty amazing if you want to control a 3D printer: https://octoprint.org/

https://tinypilotkvm.com