Automotive Seats

Automotive Seat FSRs (Force-Sensitive Resistors) are piezoresistive sensors commonly used in car seats to detect the presence of an occupant. They work by changing their electrical resistance in response to pressure applied to the seat surface. Car manufacturers set a minimum pressure threshold for these sensors; if the applied pressure exceeds this threshold, it signals the presence of a person, triggering actions like activating the seatbelt reminder alarm. However, a known limitation of FSRs is their susceptibility to “false positives,” where heavy objects placed on the seat can also meet the pressure threshold, leading to an incorrect detection.