SOUSHINE FSR411 7.5mm Force Sensing Resistor (50g-10kg)

The FSR411 is typically characterized using a 3.3V DC test voltage, making it directly compatible with 3.3V logic microcontrollers like ESP32 or Raspberry Pi. It can also be used with 5V systems, but you must ensure the current through the sensor is limited, typically by using a larger series resistor (e.g., 100kΩ) in the voltage divider circuit to prevent damage.

Connect one FSR lead to your Arduino's 3.3V or 5V pin. Connect the other lead to an analog input pin (e.g., A0) and also to ground through a fixed resistor (a 10kΩ resistor is a common starting point) to create a voltage divider. The Arduino will read a variable voltage at the junction between the FSR and the fixed resistor, which you can map to a force value using calibration.

Yes, for accurate force measurement, individual calibration is required due to manufacturing variances. To calibrate, apply known weights across the sensor's range (50g to 10kg) and record the corresponding analog readings from your microcontroller. Create a lookup table or mathematical function (often logarithmic) to map sensor resistance or output voltage to the applied force.

Force Sensing Resistors like the FSR411 generally have a fast mechanical response time (milliseconds). However, accuracy is non-linear, being most sensitive at lower forces. It is excellent for detecting thresholds, presence, or relative changes in force, but for precise, repeatable weight measurement, a traditional load cell is more suitable.