Force Sensitive Resistor RP-C7.6-ST (30g-1.5kg) - Thin Film Sensor

Connect the FSR in a voltage divider circuit with a fixed resistor (typically 10kΩ) between an analog input pin and ground. The FSR acts as the variable resistor. The microcontroller reads the changing voltage at the junction, which corresponds to the applied force. Ensure you use the ADC's voltage reference (e.g., 3.3V or 5V) for scaling calculations.

The RP-C7.6-ST is a single-zone sensor, meaning the entire active area responds uniformly to applied force. For consistent readings, ensure force is applied evenly across the sensing surface. The resistance change correlates with the total force applied, not pressure (force per unit area), so the effective sensitivity can be tuned by the size of the contactor.

Yes, its fast response time of less than 10ms makes it suitable for dynamic pressure sensing. However, for high-speed impacts, the sensor's mechanical durability and the system's sampling rate must be considered. It is ideal for measuring pressing, squeezing, or tapping forces in real-time control systems, but not for quantifying high-energy shock loads.

For quantitative force measurement, calibration is recommended. Map the ADC output readings to known weights across the 30g to 1.5kg range to create a transfer function. The resistance-force relationship is non-linear, typically following a power-law curve, so multiple calibration points will improve accuracy. For simple threshold detection (on/off), minimal calibration is needed.