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InfluxDB
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ESP32 projects (since you are compsys this is super relevant, many companies use a chip called an ESP-32 which is sure easy to code in arduino or micro-python, and can be used for many things, eg atm I'm using them to automate my door and for light displays, see https://github.com/UoA-Maker-Club/smart-lanterns)
The project doesn't have to be great, or even useful. eg https://github.com/etinaude/Monopoly-stats, a super short project cause I was bored to find the most common square a piece will land in monopoly, its got bad code, and the stats already existed, and its less than 200loc