The FSR (Force Sensing Resistor) was originally patented over 30 years ago and was a pioneering product in the sector that became known as "Printed Electronics". Designers and Engineers now had an alternative to traditional mechanical switching, and it came with a host of new features and benefits.
The basic principles of Resistive sensing have been applied to a wide variety of solutions since, including single point sensors, linear potentiometers, micro joysticks and early generation track-pads. Applications were and are wide ranging, from occupancy sensing in vehicle seats through to laptop computing, industrial controls and medical devices.
The widespread adoption of Capacitive touch sensing around a decade ago in smartphones, mobile computing and other applications should have consigned the FSR to legacy status. But in an ironic twist of fate driven by the demand for next generation tactile HMI (Human Machine Interface) solutions, Resistive force-touch sensing is now more relevant than ever.