How does a Flex Sensor Work?

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In layman's terms, a flex sensor is a variable resistor that varies its resistance upon bending. As the resistance of the sensor is directly proportional to the amount of bending, it's often called Flexible potentiometer. This sensor is commonly available in two sizes, the first is 2.2” and the second one is 4.5” long. When the sensor is straight the resistance is about 10K, and when the sensor is bent the value is 22K.


When the sensor is bent the conductive layer inside the sensor gets stretched, the cross-section of the sensor gets thinned and the resistance of the sensor increases. For example, shown above, the max resistance we can achieve is 22K. When the sensor is straightened again, the resistance returns to its normal value.

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