I've developed many eletronics boards of any instrumentations sensors, like MEMS inertial, infrared, hydrophones, pressure transducers, and others. We need some requirements that will follow some System Engineering samples, writing more technical requirements before start the project. My idea is to write these requirements, I'll start with some project, simulation, buy components, test and evaluation.
If you have interest, I have some works in webpage www.ds90pd.blogspot.com.br.
Best Regards