The Interlink 402 is a round force-sensitive resistor (FSR) with a 12.7 mm (0.5″) sensing area. It changes resistance based on applied pressure — the harder you press, the lower the resistance — making it a simple, low-cost way to detect physical pressure, squeezing, and weight in your projects.

FSRs provide a range of response rather than precise measurements, with approximately ±10% variation between sensors. They're ideal for detecting relative force (light touch vs. hard press) but not suited for exact weight measurement. Connect using a breadboard, alligator clips, female headers, or terminal blocks — soldering directly to the tabs risks melting the plastic and damaging the sensor.

Key Features

• 12.7 mm (0.5″) Round Sensing Area – Compact force detection zone
• Variable Resistance – Decreases with applied pressure
• Simple Analogue Interface – Read with any microcontroller's ADC pin
• Low Cost – Affordable pressure sensing for prototypes
• Flexible Plastic Construction – Thin and easy to mount

Ideal For

• Touch and pressure detection in interactive projects
• Wearable electronics and e-textiles
• Musical instruments and game controllers
• Squeeze and grip detection

Package Contents

• 1× Round Force-Sensitive Resistor (Interlink 402)

Resources

• FSR Tutorial — Wiring, Code Examples & Projects