Description
The FSR402 (Made in China) is a resistive thin-film pressure sensor that changes resistance inversely with applied force. When no pressure is applied, the sensor has a high resistance. As force increases on the sensing area, conductive particles within the film come closer together, reducing resistance and allowing a voltage divider circuit to convert the change into a readable analog voltage.
The sensor features a circular sensing area approximately 14.7mm in diameter and an overall dimension of approximately 73.77mm × 18.30mm . It is ultra-thin (≤0.3mm) and flexible, making it suitable for integration into wearable devices, robotic grippers, and pressure-sensitive interfaces. The Chinese variant is commonly sold with 2.54mm connectors for easy breadboard use .
Critical limitations: This is not a precision load cell. The resistance-force relationship is non-linear, and the sensor is best suited for detecting relative force changes (light vs. hard press) rather than absolute weight measurement. The Chinese supplier explicitly states it is “not recommended for situations where accurate pressure detection is required” . For applications requiring precise force measurement, a load cell with an HX711 ADC is more appropriate.
Features
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Force-Sensitive Resistance: Resistance decreases with increasing pressure; simple voltage divider interface.
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Circular 14.7mm Sensing Area: Compact active zone for fingertip or small-object pressure detection .
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Ultra-Thin Construction (≤0.3mm): Flexible and low-profile for embedded applications .
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Wide Force Range (100g–10KG per Chinese supplier): Broader range than the original Interlink FSR402, but with different accuracy characteristics .
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Long Life: Rated for more than 2 million actuations .
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Fast Response Time: <1ms per supplier data .
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2.54mm Connector Options: Breadboard-friendly connectors available .
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Cost-Effective Alternative: Lower price point than the original Interlink sensor.
Technical Specifications
| Parameter | Specification (Chinese FSR402) |
|---|---|
| Sensing Area | Φ14.68mm |
| Overall Dimensions | 73.77mm × 18.30mm |
| Force Range | 100g – 10KG |
| Off Resistance | 2MΩ |
| Thickness | ≤0.3mm |
| Force Repeatability (Single Part) | ±2.5% (8KG, 10 times) |
| Force Repeatability (Part to Part) | ±20% |
| Hysteresis | 10% average |
| Response Time | <1ms |
| Working Temperature | -20°C to +65°C |
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