Arduino Interface with Force Sensing Resistor

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1

Hello. I'm using a force sensing resistor from trossen robotics (found in the link below).

http://www.trossenrobotics.com/store/p/6445-5-Inch-Force-Sensing-Resistor-FSR.aspx

We soldered the force sensing resistor and a 10kohm resistor as in the diagram below.

We connected it to the Arduino Mega 2560 and when there is no force applied to it, the output value is 0. When we put a load on the force sensing resistor, the output value is a non-zero number. We expected that the output value will not change over time under a constant load. However, when we put a constant load on the force sensing resistor, we observed that the output values were steadily increasing.

Is there an explanation for this increase or did we connect things differently than we should have?

Thank you.

2

We expected that the output value will not change over time under a constant load.

That is where you went wrong.

This behavior is what you get from this sort of sensor.