The Flex Sensor from Electrotap and distributed by Cycling 74 is a sensor that responds to a physical range between a straight "line" and a 90° bend.
This sensor uses the same technology as many of the glove controllers used for video consoles or computer games. It outputs a conditioned signal in the industry standard voltage range of 0.25 to 4.75V.
Note: Flex sensors can be prone to produce signals that have some noise in them. It is highly recommended that you low-pass filter the sensor signal before using it to eliminate the noise or spikes from the signal.
Sensor: 1.0 x 0.62 x 3.75" (25 x 16 x 10mm)
Flex Strip: 4.5 x 0.25" (114 x 6mm)