You should now see a static numeric reading . To test the sensor, gently start to bend the flex sensor strip. You should now see the numeric readings change. The further the sensor is bent, the lower this value will drop (as seen in video below).
A similar type of sensor, are Preasure sensors and can be connected in a similar way the the flex sensors outlined in this tutorial.
I hope you found this tutorial helpful, and as always, if you have any questions, then please feel free to ask, and either myself or someone else from the EZ-Robot community will be happy to help.
Tutorial created on the 3rd October 2015