FSR Series Force-Sensing Resistors

Ohmite's force-sensing resistors (FSRs) exhibit the unique characteristic of dynamic resistance related to the amount of applied force. In general, the more force applied to the surface of the sensor, the lower the resistance. The resistance change is inversely proportional to the applied force.

Typical force-sensing resistors are characterized for human-machine interface (HMI) or machine-machine interface (MMI) applications with a sensing range from about 20 g to 5 kg. Specific device characteristics will depend on the size, shape, and materials used in construction.

Force-sensing resistors are intended for applications where a delta in applied force is to be detected. They are not intended for high accuracy or specific weight measurement applications.

In an FSR sensor, there are three mechanisms in effect which together form the force resistance characteristics. Each of these mechanisms add together and merge to create the total response curve of a typical FSR and each mechanism has different dependencies on sensor construction, mechanical integration, and the electrical properties of the ink.