I am working with some "low power" applications in which a 3.3V micro controller with some electronics around it logs some information for 20 minutes, and then the information needs to be processed. The processing step is too expensive for a micro-controller to perform, so I need a micro computer that does these calculations once in a while. I do not need USB, nor HDMI, nor ethernet etc, from the micro computer. All I need is 1) the ability to talk to the micro controller through I2C / SPI 2) the ability to work with a 3.3V input 3) the ability to run a command-line only Raspbian OS or something like that, so that I can run some Python scripts.
Any idea what kind of hardware I can use for that? Is a RPi suited? I think this is somehow related to Can I power Raspberry Pi (newer models) from 3.3v Supply Alone? , but I am a bit unsure of what the conclusion is. Should I rather use another RPi-similar micro computer? If yes, what would you suggest?