Good intro article. I have tried your DRV2603 LRA driver and it works very well. I would be interested in a follow up article that goes into detail about how auto-tune resonant frequency detection works.
It did take a bit to understand what the actual subject was, it is quite interesting. I can visualize at least one way to track the actual resonant frequency, I am sure that there are a few more. The simplest way is to use the device in the feedback loop of it's driving oscillator, like the tuning fork oscillators used in the past. That would be the cheap and easy approach and it would not need a microcontroller or any software to make it work. So probably nobody would want to do it that way.
It looks like everybody else calls these linear resonant actuators, not accelerators. Once I figured out the terminology difference, it was much easier to find more information about their applications.
What are the engineering and design challenges in creating successful IoT devices? These devices are usually small, resource-constrained electronics designed to sense, collect, send, and/or interpret data. Some of the devices need to be smart enough to act upon data in real time, 24/7. Are the design challenges the same as with embedded systems, but with a little developer- and IT-skills added in? What do engineers need to know? Rick Merritt talks with two experts about the tools and best options for designing IoT devices in 2016. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.