Description
The Original Flex 2.2 Bend Sensor is a thin, flexible variable resistor that changes resistance when bent. The sensing element is a conductive ink layer printed on a flexible substrate. When the sensor is straight, the conductive particles are closely packed, giving low resistance. When bent away from the ink side (text on the inside of the bend), the particles spread apart, increasing resistance proportionally to the bend angle .
The sensor is non-polarized—the two terminals are interchangeable . It is used in a voltage divider with a fixed resistor (typically 10 kΩ) to convert the resistance change into a voltage that an Arduino or other microcontroller can read via its ADC . Common applications include data gloves, finger bend detection, robotic grippers, and motion capture.
The 2.2″ (55.37 mm) active length is the standard size for finger-mounted applications. The sensor has a rated life cycle of over 1 million bends and operates from -35°C to +80°C .
Critical limitations: This is a bare sensor, not a module. It requires a voltage divider and ADC to function. The sensor is fragile at the base—bending or stressing the pinned end will damage it . The resistance-to-angle relationship is non-linear, and each sensor varies significantly due to manufacturing tolerance (±30% on flat resistance), so per-sensor calibration is mandatory for meaningful angle measurements .
Features
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Variable Resistance Output: Resistance increases with bend angle; simple voltage divider interface.
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Non-Polarized Two-Terminal Design: Terminals are interchangeable; no polarity concerns .
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Thin and Flexible: 0.43 mm profile, suitable for wearable and finger-mounted applications .
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Long Life Cycle: Rated for over 1 million bends under proper use .
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Wide Temperature Range: -35°C to +80°C .
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Breadboard-Friendly Connector: 0.1″ (2.54 mm) pin spacing .
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Proven Technology: Based on Spectra Symbol’s patented design, used in the Nintendo Power Glove .
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One-Direction Sensing: Reliable data only when bent away from the ink side (text on inside of bend) .
Technical Specifications
| Parameter | Specification (verify your stock) |
|---|---|
| Active Length | 2.2″ (55.37 mm) |
| Flat Resistance | Varies by batch: 10 kΩ, 25 kΩ, or 30 kΩ reported |
| Bent Resistance (90°) | Varies: 30–70 kΩ to 45–125 kΩ reported |
| Resistance Tolerance | ±30% (flat) |
| Power Rating | 0.5 W continuous; 1 W peak |
| Life Cycle | >1 million bends |
| Thickness | 0.43 mm |
| Temperature Range | -35°C to +80°C |
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