Generic RP-L-130 Force Sensitive Resistor (20g-10kg)

Connect the FSR in a voltage divider circuit with a fixed resistor (e.g., 10kΩ) between one FSR terminal and ground. Connect the junction between the resistor and FSR to an analog input pin (ADC) on your microcontroller. The other FSR terminal connects to the logic voltage (e.g., 3.3V or 5V). The ADC will read a voltage that varies with the applied force.

The RP-L-130 exhibits a non-linear, inverse relationship: resistance decreases as applied force increases. At no load, resistance is very high (>10MΩ). As force is applied from the 20g threshold up to 10kg, the resistance drops significantly, providing a usable analog signal for measurement after calibration.

While it can detect force changes, the RP-L-130 is best suited for relative force sensing, touch detection, or threshold applications rather than high-precision weighing. Its response is non-linear and can vary with temperature and point of load application. For accurate weight measurement, a dedicated load cell with a strain gauge is recommended.

The FSR itself does not have a specific operating voltage; it is a passive resistive element. The voltage applied across it in your circuit (typically 3.3V or 5V logic level) should be chosen to match your microcontroller's ADC reference voltage to ensure accurate readings and avoid exceeding the sensor's power dissipation limits.