It looks like you have some familiarity with a variety of different technologies which is fantastic.
The most important thing is just to pick a direction and get started. It doesn't have to bee anything more specific than "I want to build something using Raspberry Pi".
Once you pick a direction you can start working through some basic tutorials and learning the ropes. At this point after understanding what's possible you might get some ideas about what you might want to do.
If you don't have ideas yet that's ok, but now you're pretty well equipped to research what other people have been doing with your platform. You could build somewhat different alternatives to existing projects, or work on trying to contribute an extension to an existing project.
If just looking at projects doesn't spark any ideas start talking to people. Start with people who might know something about your topic at your university, or reach out to individuals in the community.
The key to a research project is just getting interested in one idea or question. Once you develop a little curiosity about on little thing it's like pulling on a thread that's connected to a much larger tapestry. Maybe your original idea has already been done but you find something else that's closely related that hasn't been done. You'll quickly be able to follow this tiny thread to a much larger world that will be of great depth and in general can be very interesting. If you have the diligence to carefully review existing work it's not hard to steer yourself to a totally uncharted area (this is probably a lot of work for a senior thesis but if you find it fun then go for it).
Also don't worry too much about originality. Re-creating something that already exists is a good learning experience, and might lead to other interesting ideas, like taking an existing thing and using it for a slightly different purpose. Just make sure to give credit where it's due. This isn't a PHD thesis and I don't think you'll be knocked for not making some brilliant original discovery. The key thing is to get started and follow your curiosity.