The tough part is the blood sugar sensor which this article doesn't really address. These have to be reliable, accurate, fail-safe to some extent, and have to last a significant amount of time. Although these continue to improve, there's still a lot of work to be done on this. The pumps have been around for a while and the technology is relatively mature. A smartphone is ok for research and testing, but there will have to be a simple, low power, reliable, fail-safe device much like a pacemaker before this is anything but a research project.
I think the appeal about this subject is that it's current, uses current technology, is about directly bettering some people's lives significantly, and is personal with one of the researchers having a strong family interest in the success of the project.
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