I want to know what the circular force sensor outputs when it is connected to the breadboard (with resistor). Does it output force measured in grams? When I slightly touch the sensor with a finger, the output value varies around 500-600.

Another question: Do I need to somehow calibrate the output values in order to use them for other measurements?

  • $\begingroup$ It's just a variable resistance. I doubt that it is calibrated at all. $\endgroup$
    – Dave Tweed
    Mar 2 '16 at 3:08
  • 3
    $\begingroup$ 500-600 Ohms? 500-600 Volts? 500-600 llamas? Units are important. $\endgroup$ Mar 2 '16 at 12:54
  • 2
    $\begingroup$ Units! units! units! $\endgroup$
    – DLS3141
    Mar 2 '16 at 13:32

There is a link to the company's integration guide on the page you linked which is very explanatory.

These sensors show a decrease in resistance with increasing applied force. I have no idea what you mean by "connected to the breadboard (with resistor)", but the most simple way to read this device would be to connect it to a multimeter set to read resistance. Once you know the resistance you can calculate the approximate force from the curve on page 5 of the integration guide (shown below).

So, if you are reading 500 Ohms of resistance across the force sensor, then the approximate mass on the sensor (force $\neq$ mass, argh) is 4 kg. In order to get a more accurate measurement though, you will need to calibrate the sensor with a range of known masses since every sensor produced by the company will be slightly different.

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