The RMS loop gives me a particular explanation to try in my own words. A reading becomes input volts, the offset is removed, its square joins a running total, and that total is averaged and rooted. Then a calibration factor supplies the sensor scale. I can point to each operation in the saved program. Knowing why it belongs there is a more interesting target than recognising the same lines every time I open the file.
The RMS loop gives me a useful example. I can list the operations: remove the offset, square the values, add them, divide by the count and take the square root. The next question is why each operation belongs there. If I can only repeat the sequence, I might not notice when a value has the wrong meaning before it enters the loop. The physics is what lets me check the sequence instead of memorising it.
I'm trying the explanation in ordinary words first. The shifted sensor output includes a middle value that isn't the alternating part I want. Squaring stops the positive and negative parts simply cancelling. Averaging brings the set of squared values together. The square root brings the result back to the corresponding scale. Then I have to be clear about the sensor relationship and calibration. Saying it out loud in my head exposes where I’m joining two different steps too quickly.
My mentor's help matters in a different way when the question involves the circuit in front of us. The program, sensor and connections have to agree. A general explanation can't inspect the actual arrangement on my behalf. The useful discussion is where I can show which part I understand and which connection between ideas is missing. I want to leave that discussion able to explain the next action myself, rather than only remembering that I was told to make a change.
I'm keeping the different kinds of help visible. Existing example code can supply a starting point. A component's documentation can establish how a part is meant to behave. A worked example can help unpack unfamiliar wording. A mentor can guide a decision or point out something I've overlooked. None of that automatically describes what I personally wired, changed or checked. Those are details I need to record in their own right.
The calibration guide gives a separate relationship I can explain alongside the loop: the new factor is the old factor multiplied by reference reading divided by program reading. That’s not the same job as removing an offset or calculating RMS. The actual source makes it possible to keep these ideas distinct. A correct average of squares can still have the wrong sensor scale, while adjusting a scale cannot repair a misunderstanding about the input centre. Explaining the stages separately helps me see what a particular change could affect.
That doesn't make the project less mine. What matters is whether I understand the choices I carry forward and take responsibility for checking the result. I don't have to pretend I an ADC or every function in a library. I do have to know what I’m asking those tools to do. Otherwise a working example could leave me stuck the moment I need something slightly different from the original arrangement.
I'm also noticing that I can be confident in one part and uncertain in another. I can work through the little RMS example and still have an unresolved sampling question. I don't need to describe the whole project as either completely understood or completely confusing. Marking the actual gap makes it easier to learn. It also stops the parts I do understand from getting lost in a general feeling that there is too much left.
One useful question is what would change if I altered an assumption. If the offset changes, which stage is affected? If the sampling interval changes, which quantities depend on it? If a calibration value belongs to a different setup, where would that enter the result? I don't need to make every possible alteration to think through the consequences. The questions show whether the explanation has any flexibility beyond one saved answer.
I want the notes to preserve that reasoning alongside the final version. A list of finished values doesn't show why an earlier guess was wrong or which explanation finally helped. At the same time, I don't need to save every repeated explanation as if length were understanding. The useful record is the particular question, the relevant idea and what I did with it. That’s what I would want to find when returning after a break.
The route through the saved programs is becoming easier to describe in parts: communication, raw channel values, centring, RMS and the combined quantities. Different files make different assumptions, including fixed offsets in the smaller RMS sketch and estimated means in the final one. Keeping that distinction visible is more useful than treating a running program as evidence that every explanation is already complete.
I can test an explanation by following the meaning of the number through it. The useful achievement is a line whose role I understand well enough to use in a different question.