Drift Phenomenon

Caution for Sustained Load Application - Drift

When load is applied to the sensor for an extended period, the measured resistance value gradually decreases. This is called the Drift phenomenon. This phenomenon commonly occurs in most known FSR sensors.

For example, if a 500g weight is placed on the sensor and the ADC value is measured at 130, the ADC value will gradually increase over time (several minutes). It increases on a log scale to a certain point, then stops increasing. This phenomenon is resolved when the load applied to the sensor is removed.

The drift phenomenon is a type of creep caused by material properties and cannot be fundamentally avoided. It may appear as malfunction, so caution is required during use.

To avoid this, it is best to avoid applying load for extended periods whenever possible.