FSR-402 Force Sensitive Resistor Pressure Sensor Round

The FSR-402 Force Sensitive Resistor Pressure Sensor Round is a thin 0.3mm flexible film sensor with a 20mm round active sensing area and 65mm overall sensor length, whose electrical resistance decreases as applied force on the sensing area increases, with a response time under 1ms and operating range of 3.3V to 5V DC. The fsr 402 pressure sensor is fundamentally different from load cell-based weighing systems — it requires no amplifier chip like HX711, instead working as a simple variable resistor that changes value with applied pressure or touch force.

The fsr pressure sensor must be connected in a voltage divider circuit — one leg of the FSR connects to a fixed resistor (typically 10kΩ) to form a divider, and the midpoint voltage connects to an Arduino analog input pin. As applied force increases, the force sensitive resistor sensor resistance drops from megaohms (no touch) toward a few hundred ohms (firm press), causing the divider output voltage to rise correspondingly — analogRead() values increase with increasing pressure. The fsr 402 force sensitive resistor is not a calibrated weight sensor; it provides relative force/pressure changes rather than absolute grams or kilograms without extensive characterisation.

The fsr force sensitive resistor pressure sensor has non-linear and somewhat inconsistent response across units — readings vary between individual FSR-402 sensors and drift slightly with repeated use, making it suitable for touch/grip/presence detection but not for precision weight measurement applications. Available from StemVolt, this FSR-402 force sensitive resistor sensor is ideal for enthusiasts and learners developing pressure sensing, touch detection, and interactive electronics projects with responsive force measurement capabilities.