RP-4D Force Sensitive Resistor (10g-1kg) - 4-Direction Sensing, 0.3mm Film

The RP-4D outputs a variable resistance. Connect one side of a sensing zone to your microcontroller's analog input pin (e.g., A0 on Arduino) via a pull-down resistor (typically 10kΩ), and connect the other side to Vcc (3.3V or 5V). The ADC will read a voltage that decreases as force increases. You will need to read four analog pins, one for each independent zone.

The four zones allow for directional force detection. By monitoring the resistance change in each zone separately, you can determine not only if pressure is applied, but also the approximate location and direction of the force (e.g., up, down, left, right). This enables more complex input gestures and spatial pressure mapping than a single-zone FSR.

While it can detect forces between 10g and 1kg, the RP-4D is best suited for threshold detection, touch sensing, and relative force measurement rather than high-precision weighing. Its response is non-linear and requires calibration for specific applications. For precise weight measurement, a dedicated load cell is recommended.

The sensor features a rear adhesive layer for easy mounting onto flat or gently curved surfaces. Ensure the sensing zones are not covered by rigid materials that could concentrate force unevenly. Its flexible film construction is durable for millions of actuations but should be protected from Sharp Microelectronics objects, punctures, and excessive bending at the connector points.