Reference: RBD-3669
Brand: DFRobot
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A simple Flex Sensor 2.2″ – Bend Sensor with a length of 2.2″ which bends and flexes with a physical device. As the sensor is flex, the resistance across the sensor increases. A connector is 0.1″ spaced and breadboard friendly. Applications in – Robotics, Gaming (Virtual Motion), Medical Devices, Computer Peripherals, Musical Instruments, Physical Therapy.
Product Images are shown for illustrative purposes only and may differ from the actual product.
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Before we get to circuit-building and Arduino-programming, here's a quick rundown of the flex sensor's important electrical characteristics.
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 50k-70K Ohms when the sensor is bent to 90°, as in the diagram below).
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.

Flex sensor bend direction (from SpectraSymbol Datasheet).
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.
The sensors have solder tabs that are stapled through a flexible substrate to make contact with the semi-conductive material. Depending on your project application and skill set, there are a few methods of connecting to the sensor. Some assembly may be required to connect to the pins reliably.
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| General Specification | |
| Flex length(mm) | 2.2" (56) |
| Total Length (cm) | 7 |
| Life Cycle | >1 million |
| Height | 0.43mm (0.017") |
| Flat Resistance | 30K Ohms ±30% |
| Bend Resistance | minimum 20K Ohms ±30% (@ 180° pinch bend) |
| Power Rating | 0.5 Watts continuous; 1 Watt Peak. |
| Shipment Weight | 0.002 kg |
| Shipment Dimensions | 3 × 2 × 1 cm |
Please allow 5% measuring deviation due to manual measurement.
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1 x Flex Sensor 2.2" Original
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