This week mine was homemade soda. Fermented sodas, citric acid + bicarbonate sodas, different juices and flavors like lime + lemon + cherry and pomegranate or mango peach or cola (homemade knock off)
This week I decided I was going to re-create the shared spreadsheet to my investment club portfolio, which quickly turned into writing a Python investment tracker
I've lost several nights to writing it so far, but it feels a little at the brink of disinterest now. There's only like a 5% chance I finish either the spreadsheet or the tracker at this point
--UPDATE--
I'm moved on to researching how car infotainment systems work and if it's possible to make your own. Guess it's just one of those weeks.
It is possible to make your own! You can use an old tablet, or even better a raspberry pi and touch screen. Then you add a hat with a better dac and send the audio to an amp. It's really cool, but I'm pretty sure just buying an actual aftermarket unit will get me a better unit for less money and much less work...
Those are a massive security problem if you connect them to the internet though because they never get updated and we tend to use them for much longer than any phone.
True, I was never going to do that though so it didn't matter for me. I just want a receiver for Android Auto and my phone will do all the connecting and thinking.