I have an idea for a product startup. It is a wearable device with one functionality, around which I and my friend started to think. We are pretty sure that we can develop it with only this functionality but I know with only one application of this hardware we wont be able to sell it. Here, I thought we could bring the design process to polish our product and add some more features.
Creating UX for any application can be done by a standard design process but when it comes to designing a device it doesn't seem correct to follow the same road. Designing UX for physical products and finding related articles on the internet is quite difficult.
Of course UX design is the part of the design process. As I can do the UX for software but I couldn't get my head around it for physical devices. I don't know where to start and how to start.
How should my design process for a physical device be different from designing a software interface? (Should I start building the prototype and test it afterwards? If no/yes, then how do I proceed?)