I am going to order raspberry pi zero w, camera and memory card with operating system installed. ...
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Yes. Kodi is a multimedia player Operating System used to have plugged to the TV and playing films and so on. Raspbian is a full GNU/linux operating system you'll be able to use as camera and many more: server, multimedia player, trail cam... Use the Desktop Raspbian and not the Lite version.
I should have googled those operating systems and read about them. Those two operating systems are what web shop I was going to order parts from offers installed to sd card.
I have installed Raspbian to sd card before but was going to be lazy this time.
I found raspberry pi zero w locally so I will not order anything from that web shop after all. My spectrometer will be ready in few days. I will go and buy parts tomorrow.
Only thing that is missing for my experiments is colorimeter reagents. I might buy single aquarium water test kit so that I have something to experiment with before my reagents arrive.
I will print case instead of build it from Lego.
Cooool! Shoot any doubt you find in the process ;D