Four steps. No secrets, no methodology I'm trying to trademark. Just the version of this that actually works for me.
Before I pick up a single component, I read. Datasheets, forum threads, the occasional YouTube rabbit hole at 1am. Understanding why a component behaves the way it does is worth three failed prototypes. I'd rather spend a day reading than a week debugging something I didn't actually understand.
This is also where I admit what I don't know. Pretending to understand something is how projects die quietly. Asking early is how they survive.
Then comes the boring, important part: choosing components and sketching how the system should work. Not a full circuit diagram yet — just enough to know what talks to what, what the power budget looks like, and where the interesting problems will show up.
I try to keep this phase short. Planning for too long kills projects. The plan exists to point me in roughly the right direction; the real answers come out of the next step.
This is the fun part. Breadboard first, always. I build the smallest version of the thing that can actually prove it works. Once the core loop is running — receiver reading signal, motor spinning, light turning on — I add features one at a time, testing each before moving on.
Arduino and Discovery boards get most of my builds; the rule is whatever finishes the job fastest. If an off-the-shelf module makes sense, I use it. If I can learn something worthwhile by doing it from scratch, I do that instead.
Nothing is done until it's been tested in the conditions it's meant to run in. A circuit that works on my desk is not a circuit that works on a moving RC car at full throttle, or a street light system in actual rain.
I test, I break things, I fix them, I test again. The goal isn't perfection — it's something I can trust. Something I'd be willing to put my name on, knowing someone else is going to rely on it.