In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

Designing such a system should be failure-proof, and ultrasonic detectors can't make a difference between cars, ice bears, people, etc., so chances malfunctions are great that.

IMO, Beau's DLC comments are very valuable. DLC does not rely on incuctance changes of coils, but on the change of coupling of coils caused by metal parts brought close to the coils. So ice bears would not have a chance incfluencing this system (unless they are carrying a fridge, or something similar).

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