This is a clone version of the Flex Sensor 4.5", commonly available in the local market. Unlike the original Spectra Symbol version, this variant shows only a minimal and abrupt resistance change (typically 1–2 kΩ) between straight and bent positions, which may impact precision in sensitive applications. It is a cost-effective option suitable for basic or non-critical use cases, but we do not recommend it for projects requiring high accuracy or consistent sensor behavior.
Looking for the original? Flex Sensor 4.5" Spectra SymbolThe Flex Sensor 4.5" china is a basic bend sensor that detects physical movement and translates it into variable resistance output. As the sensor flexes, the internal carbon elements respond by increasing resistance, enabling precise angle displacement measurements. Designed to operate in a wide temperature range from -35°C to +80°C, this sensor is suited for fields like robotics, gaming, medical instrumentation, musical interfaces, and physical therapy devices. Trusted by industry pioneers and once featured in the Nintendo Power Glove. Featured By RoboticsBD.
Product Images are shown for illustrative purposes only and may differ from the actual product.
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Features:
High Durability – Withstands over 1 million cycles of bending
Wide Temperature Tolerance – Operational in extreme conditions: -35°C to +80°C
Compact & Lightweight – Only 0.43mm in height and 0.015kg in weight
Low Power Operation – Rated at 0.50W continuous with 1W peak for energy-efficient applications
Simple Integration – Ideal for beginners and professionals in electronics and embedded projects
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Applications:
Robotics Projects – Used in animatronics and motion detection in robotic limbs
Gaming Interfaces – Perfect for motion-based game controls and VR gloves
Medical Devices – Track joint movement or patient recovery in physical therapy
Wearables & Smart Clothing – Integrate into garments for gesture-based control
Music & Art Installations – Create bend-sensitive musical or visual effects
Computer Peripherals – Develop ergonomic input devices like adaptive keyboards
Research & Education – Widely used in universities and prototyping environments
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| General Specifications |
| Sensor Length | 4.5 inches |
| Flat Resistance | 10K Ohms |
| 90° Bend Resistance | - |
| 180° Bend Resistance | - |
| Max Bend Resistance Range | - |
| Resistance Tolerance | ±30% |
| Life Cycle | >1 million |
| Thickness (Height) | 0.43mm (0.017") |
| Temperature Range | -35°C to +80°C |
| Power Rating | 0.50 Watts continuous, 1W peak |
| Shipment Weight | 0.015 kg |
| Shipment Dimensions | 12 × 8 × 3 cm |
Please allow 5% measuring deviation due to manual measurement.
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Documentation:
- Datasheet
- Flex Sensor Hookup Guide
Flex Sensor Overview
Before we get to circuit-building and Arduino-programming, here's a quick rundown of the flex sensor's important electrical characteristics.
How it Works
When the sensor straightens out again, the resistance returns to the original value. By measuring the resistance, you can determine how much the sensor is being bent.
The flex sensor is designed to be flexed in just one direction – away from the ink – as demonstrated in the image below.
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Bending the sensor in the other direction will not produce any reliable data, and may damage the sensor. Also take care not to bend the sensor close to the base, as they have a tendency to kink and fail.
Package Includes:
1 x Flex Sensor 4.5" China
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