DIY design.

After he read a book on the automation of arrays, Blake found out that the main area he was meant to be focused on was making the array periodic.

As long as the array had a power source it would continue to remain active until it had completely drained the power source. So since he didn't want the humidifier to continuously spew out essential oil, Blake needed to learn how to make arrays periodic.

"This was way easier than I thought." Blake was ecstatic when he saw that the book was not only straightforward, but it explained all the tiers of periodic arrays in great detail.

Since the humidifier wasn't any complex weapon of mass destruction, it needed only the basic tier of periodic arrays.

The best part of the book was that it taught all the sets of symbols for every second up to 50 secs. So all Blake had to do was look at all of them and have the system remember them when he needed to learn them.