SOUSHINE SBR Film Pressure Sensor, FSR 406, 780mm Cord - 10g~15kg Range

The sensor itself is a passive resistive element with no active electronics, so it does not have a fixed operating voltage. For interfacing, you typically apply a voltage (e.g., 3.3V or 5V) across its two wires in a voltage divider circuit with a pull-down resistor. The output voltage read by your microcontroller's ADC will be proportional to the applied force. Ensure your measurement circuit uses a voltage within your microcontroller's logic level limits.

Connect one FSR wire to your Arduino's 5V (or 3.3V) pin. Connect the other FSR wire to an analog input pin (e.g., A0) and also connect that same analog pin to GND through a fixed resistor (typically 10kΩ acts as a pull-down). This forms a voltage divider. The Arduino will read a varying analog voltage (0-Vcc) based on the force-dependent resistance. You can then map this ADC value to a force using calibration data or a provided force-resistance curve.

While it can detect force in the 10g to 15kg range, it is not a precision load cell and is not ideally suited for accurate weight measurement like a digital scale. Its output is non-linear, especially at the extremes of its range, and it is sensitive to the distribution of force across its active area. It is best used for detecting presence, pressure, relative force changes, or touch interactions rather than providing calibrated weight readings.

For consistent readings, the sensor's active square area should be mounted flat against a rigid, smooth surface. Use a thin, non-compressible adhesive or a mechanical clamp around the edges to secure it without putting pressure on the sensing zone. Ensure the applied force is distributed evenly across the active area. Avoid Sharp Microelectronics bends or creases in the sensor film or its cable connection point to prevent damage.