This is a genuine Flex Sensor 4.5" manufactured by Spectra Symbol. In Bangladesh, many sellers distribute Chinese clones while claiming them to be original. The most significant distinction lies in resistance behavior: the authentic version exhibits a substantially higher and gradual resistance shift (typically 20–40 kΩ) between straight and bent positions. In contrast, the clone version shows only a 1–2 kΩ change, often abruptly. For applications requiring accuracy and consistency, we strongly recommend using the original sensor.
We also carry the clone version: Flex Sensor 4.5" ChinaThe Flex Sensor 4.5" Original by Spectra Symbol is a premium 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. With an unflexed resistance of around 10K Ohms and the ability to stretch up to 110K Ohms at maximum bend, it offers high flexibility and responsiveness. Its patented construction ensures durability with over 1 million life cycles, and its minimal 0.43mm thickness makes it ideal for space-constrained applications. 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, the Flex Sensor 4.5" Original is a must-have for interactive tech enthusiasts. Featured By RoboticsBD.
Product Images are shown for illustrative purposes only and may differ from the actual product.
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Features:
Original Spectra Symbol Build – Patented, industrial-grade flex sensing technology used in iconic devices
Variable Resistance Output – Measures flex with resistance increasing from ~10KΩ to 110KΩ
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 | ~14K Ohms (±30%) |
| 180° Bend Resistance | ~22K Ohms (±30%) |
| Max Bend Resistance Range | 60K – 110K Ohms |
| 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
One side of the sensor is printed with a polymer ink that has conductive particles embedded in it. When the sensor is straight, the particles give the ink a resistance of about 30k Ohms. When the sensor is bent away from the ink, the conductive particles move further apart, increasing this resistance (to about 10k-70K Ohms when the sensor is bent to 90°, as in the diagram below).
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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.
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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" Original
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