Generic Force Sensitive Resistor RP-C30-ST (20g-20kg)

Interface the FSR by creating a simple voltage divider circuit. Connect one FSR lead to your microcontroller's analog reference voltage (e.g., 3.3V or 5V) and the other lead to both an analog input pin and a pull-down resistor (typically 10kΩ) to ground. The voltage at the analog pin will vary proportionally with the applied force. Read this value using the ADC on your Arduino or Raspberry Pi (via an ADC hat for Pi).

The RP-C30-ST exhibits a negative piezoresistive coefficient; its electrical resistance decreases non-linearly as the applied force increases from the 20g threshold up to 20kg. The resistance is highest (typically in the megaohm range) with no force and drops significantly under load. For precise measurement, calibration with known weights across your intended force range is recommended to map ADC readings to specific force values.

Ensure even force distribution across the active sensing area using a rigid, flat actuator or overlay. Avoid Sharp Microelectronics points of contact. The sensor is sensitive to temperature; for stable readings, account for ambient temperature changes within its -40°C to 85°C range. Its thin 0.4mm construction requires careful handling to avoid creasing or puncturing the active material. For repeated mechanical cycles, consider the sensor's lifecycle durability for your specific application.