You question was not actually closed, it was simply cleaned up for inactivity. 

Without a sign that some positive activity is likely to happen here, such as someone wanting to answer it or many people wanting to upvote it, then it will likely receive the same fate in another month.  

Undeleting it without some effort on your part to make it more relevant and palatable to others is unlikely to be a constructive use of anyone's time. At the very least you could show what your research has found in the month between your posting the question and now. *<sub>(you have been doing some research on your own haven't you?)</sub>*

Until then it remains in limbo, not actually closed as off-topic, but just unloved and as a result tidied away.

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If you had read the help centre article that was linked next to the deletion notice posted by Community you would have been at the page https://superuser.com/help/roomba which tells you exactly what criteria are used for cleanups.

[![enter image description here][1]][1]

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<sub>From comments below and my own thoughts</sub>

You are asking a *community* of people to answer your questions, so the onus is on you to make your questions relevant, interesting, inviting and even appealing to other people. Without interest from other people then the system will work as designed and clean up what looks like Just Another Unwanted Question.

You need to give people a reason to want to upvote and answer it. Make it relevant to other people somehow, involve them, get them invested, make them want to help you. As it stands it's just a pie-in-the-sky theoretical "it might be possible" and no-one cares enough about it except you. 

Until other people care we'd just be going around the loop of undeleting and reposting the same question that no one wants to answer. It's not a bad question, it's just not anything that anyone is going to get invested in without some evidence that it's not just them doing all the hard work of first finding out *if* it is possible and then *how*.

As it stands I suspect that the downvotes are because it *sounds* like your hardware hack will only work in a select set of cases and is not particularly robust. There's no real evidence that what you want is possible and no real application for any user other than you. Sure, you can only really post questions about problems *you* face, but you have to bear in mind that without making it relevant to other people then you have no audience for your question and very little future value.

  [1]: https://i.sstatic.net/kYocC.png