I think there are lots of things that can fail in the hardware: electrical noise (standard stuff), radiation, metastability, etc. It's not just a bad speed signal... it's a valid speed signal but the software reading inconsistent states based on these errors, or having values change when they shouldn't, etc.
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. Specifically the guests will discuss sensors, security, and lessons from IoT deployments.