Flex (bend) sensor 4,5"

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This sensor can detect bending in one direction. 

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These sensors are easy to use, they are basically resistors that change value based on how much their flexed. If they're unflexed, the resistance is about ~10KΩ. When flexed all the way the resistance rises to ~20KΩ. They're pretty similar to FSRs so following this tutorial will get you started (link to Adafruit).