Yes; it's almost identical. It's one of the simplest digital low-pass filters you can write. Basically, it does the same thing that an analog R/C filter would

Yes; it's almost identical. It's one of the simplest digital low-pass filters you can write. Basically, it does the same thing that an analog R/C filter would do (given sufficient precision and sampling rates). The issue with the breathalyzer code wasn't that the algorithm was incorrect, but that the programmer used the wrong algorithm.