My first ever project, which was honestly kind of a mess, but I learned a ton. I cobbled together a device that could be used to track how much you drank throughout the day. Thanks to a humidity and temperature sensor it would also pressure you too drink more it was hot or dry that day. The goal was of course to reach the daily goal you set. The heart of the project was a raspberry pi on which a SQL database, a ton of python code and the website ran (which served as the GUI of the device). The instructables & github.