Glossary:Key specifications of force sensing resistors

Post by Vicky Liu, Updated on May 24^th, 2024

Key Specifications of Force Sensing Resistors (FSRs)

Force Sensitivity Range:

FSRs can typically sense forces ranging from 0.2N (20 grams) to 20N (2 kilograms) or more, depending on the specific model and application requirements.

Operating Voltage:

The typical operating voltage range for FSRs is between 1V and 5V. They function well within these voltages, allowing easy interfacing with microcontrollers and other electronics.

Response Time:

FSRs have a fast response time, usually in the order of milliseconds. This makes them suitable for applications requiring quick detection and response to applied force.

Durability:

FSRs are designed to withstand millions of actuations, providing long-term reliability in demanding applications.

Linearity:

FSRs exhibit a non-linear response, meaning the change in resistance is not directly proportional to the applied force. However, they are often linearized through calibration for specific applications.

Operating Temperature Range:

FSRs generally operate effectively within a temperature range of -30°C to +70°C, making them suitable for various environmental conditions.

Thickness and Flexibility:

FSRs are typically thin and flexible, with thicknesses ranging from 0.2mm to 1mm. This allows them to be easily integrated into various surfaces and materials.

Resistance Range:

The resistance of an FSR changes inversely with the applied force. Typical resistance values range from several megaohms with no load to a few hundred ohms at maximum load.

Actuation Force:

The minimum force required to produce a measurable change in resistance, known as the actuation force, is typically around 20 grams.

Repeatability:

Repeatability ensures consistent output for repeated applications of the same force, typically within ±2% to ±5%. High repeatability is crucial for applications requiring precise force measurement.

Drift:

Drift indicates the stability of the FSR over time under a constant force. Typical drift values are less than 5% over 24 hours. Low drift is essential for maintaining the accuracy of measurements over time, especially in long-term monitoring applications.

Applications

Consumer Electronics: Used in touch-sensitive panels, gaming controllers, and wearable devices. Medical Devices: Used in patient monitoring systems, prosthetics, and pressure-sensitive beds. Industrial Automation: Used in robotic grippers, load sensing, and feedback systems. Automotive: Used in seating systems, dashboard controls, and impact sensors. These specifications and characteristics make FSRs highly adaptable to a wide range of applications, providing precise and reliable force measurement capabilities.

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