<a href="https://github.com/hoglet67/RGBtoHDMI" rel="nofollow">https://github.com/hoglet67/RGBtoHDMI</a><p>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.<p><a href="https://stardot.org.uk/forums/viewtopic.php?f=3&t=14430" rel="nofollow">https://stardot.org.uk/forums/viewtopic.php?f=3&t=14430</a>
Depends on your definition of `cool';
here's a multi-zone Smart thermostat...
<a href="https://joetruncale.medium.com/thermos-d089e1c4974b" rel="nofollow">https://joetruncale.medium.com/thermos-d089e1c4974b</a>
a smart cat flap...
<a href="https://github.com/gerrito333/mousehunter-edge/blob/master/README.md" rel="nofollow">https://github.com/gerrito333/mousehunter-edge/blob/master/R...</a>
and a meteor detector!
<a href="https://www.skyatnightmagazine.com/advice/diy/raspberry-pi-meteor-detector/" rel="nofollow">https://www.skyatnightmagazine.com/advice/diy/raspberry-pi-m...</a>
I've been wanting to build a smart mirror like this for a while! <a href="https://magpi.raspberrypi.org/articles/build-a-magic-mirror" rel="nofollow">https://magpi.raspberrypi.org/articles/build-a-magic-mirror</a>
I came across this awhile back and thought it was a pretty cool project:
<a href="https://youtu.be/_nBK8sAl9nw" rel="nofollow">https://youtu.be/_nBK8sAl9nw</a>
Octoprint is pretty amazing if you want to control a 3D printer: <a href="https://octoprint.org/" rel="nofollow">https://octoprint.org/</a>