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Description: This is a force sensitive resistor with a square, 1.75x1.5", sensing area. This FSR will vary its resistance depending on how much pressure is being applied to the sensing area. The harder the force, the lower the resistance. When no pressure is being applied to the FSR its resistance will be larger than 1MΩ. This FSR can sense applied force anywhere in the range of 100g-10kg.

Two pins extend from the bottom of the sensor with 0.1" pitch making it bread board friendly. There is a peel-and-stick rubber backing on the other side of the sensing area to mount the FSR.

These sensors are simple to set up and great for sensing pressure, but they aren't incredibly accurate. Use them to sense if it's being squeezed, but you may not want to use it as a scale.

Dimensions:

  • Overall length: 3.5"
  • Overall width: 1.75"
  • Sensing area: 1.75x1.5"

Documents:

Comments 27 comments

  • At the risk (which I accept frequently ;o} ) of sounding picky:
    1) “Force” and “pressure” are not the same thing, but the terms appear to be used interchangeably in the description. It would be helpful to know which this senses. If one exerts 10 newtons of force on a 1 cm X 1 cm area of this sensor, that’s four times the pressure of the same 10 newtons on a 2 cm X 2 cm area, but the same force. How, if at all, does the sensor respond differently to the two loads?
    2) Speaking of “newtons”, a “newton” is a unit of force. Neither a “gram” nor a “kilogram” is; they are units of mass.
    3) Lastly, unless plane geometry has been changed radically in the ~four decades since I studied it, there’s no such thing as a “square, 1.75x1.5” anything.
    Eric

    • Hi Eric,
      Thanks for pointing this out to us. I will have this description reevaluated for proper information. We will try to address your concerns, and questions in the revised description.
      Thanks,
      Timothy

    • After reading the documentation, it appears it senses a not quite linear function of pressure times area. Thus, it is kind of a pressure sensor, and kind of a force sensor… the description shows the lack of clarity fairly well.
      If you’re interested in one or the other, create a consistent contact patch, and calibrate according to your needs. I suspect that it will be simpler to make it “just pressure”, but it all depends on what’s at hand.
      As to your example, alas… it appears the answer may even depend on which cm2’s you choose to test.
      But I’ll have to completely grant you the “square” issue. Unless they’re trying to very obscurely describe a measurement of 2.625 inches on each side.

  • Neat! a Jedi Sensor!

  • Could this be insulated and used as a water pressure sensor (dividing the force by the area)?

  • I would like to use the FSR in a mailbox so when an envelope is placed on top of the sensor it will trigger. Would a standard, around 1 oz., piece of mail work or it is not that sensitive? Any other sensor suggestions? Light sensors would not be an option because the back area is always lit.

  • Hello, since I’m new to this would this be better for sensing impact or this one: https://www.sparkfun.com/products/9196

    I want to make something that can detect the force and magnitude of an impact (for example, if I were to hit it with my fist) and was wondering whether this product or the other one would be a better option. Thanks in advance.

  • Is there a maximum pressure/weight for these? I couldn’t find anything in the documentation. I don’t want to measure weight, just identify if it is present which an FSR seems ideal for. What I want is a pressure sensor that detects if someone is standing on a metal plate.

  • It might be of interest to users that it is the conductance of these sensors that is linearly proportional to pressure, not their resistance. When you use them in a simple voltage divider circuit the voltage output will be highly non-linear, i.e. a 1/x curve. For a linear voltage output proportional to pressure you need to drive it with a constant-current source. The simplest way is to connect the FSR between a fixed reference voltage and the input of an op-amp inverter (with no other resistance in series with the FSR). The feedback resistance and the value of the reference voltage will determine the output range. Of course, the output will be inverted and you need to set up the opamp’s power supply properly.

  • Wish there was a better solution for mounting this. Mine busted pretty easily while trying to bend the tail.

  • This sensor limit is 10kg(9,8N), the same as the 0.5" one (SEN-09375), why does this one have the same limit even though it has 6 times the area?

  • I’m having trouble getting this sensor to register small touches. It registers if I squeeze the entire surface with a flat object, but not if I just squeeze a part of it with two fingers.

    It basically works if I squeeze all of the surface, but it does not register if I only squeeze a small point on the surface really hard.

    I’m using a 10k resistor. Should I drop that down? I’m using a pull down wiring setup as described in the first section of the guide.

    Thoughts??

  • Curious if once calibrated at zero, 1/3,2/3 and full scale, do these devices hold as far as remaining consistent?

    With low linearity, what was the application these were designed for?

    Cioara from Betclic

  • These sensors look like the ones that are used in the Native Instruments maschine. Their version of the pads have a square hole in the middle for the leds and are working slightly different i think. But maybe it is a good idea if sparkfun (if it is possible) add similar square pads with a hole for leds?

    here is a link to the NI Maschine teardown.

  • How do you solder onto these things? Is there another way to make connection with them?

  • hi all, how do you cover / mount this in your project usually? i mean, is it possible to put a plastic film on top of it (or something similar) ?

  • All your pressure/force sensors seem to be not “incredibly accurate”.
    I’m looking for a sensor that can register weights in the 50-300 grain range with an accuracy and repeatability of no less than 2 grains/10%.
    That’s what I would call “moderately accurate”… but I don’t see any of those mentioned.
    Did I just miss them? Or do you not stock them?

  • is this sensor flexible. Can it be bent?

  • Would this sensor register light “hits” such as hand drumming? Is the sensor flexible? Are there smaller versions? Would you recommend a different sensor if the project requires the sensor to register light “hits” with the fingers? Even a “forceful touch” should register (and later produce a sound).
    Thanks in advance for your help!

  • Here is a video of how we used with an indian make of the arduino ! Also provided is the connection detail and the code.
    http://tenettech.com/comet/?page_id=191

  • Or try a piece of conductive foam between two pieces of copper clad pcboard stock.
    But this is much cleaner.

  • These work very well. I was able to hook them up to an Arduino with a simple voltage divider circuit (as suggested by the FSR integration guide), but I did not have to use an amplifier.
    I wrote a simple script to send the pressure data via serial from the Arduino, and then used it in a Panda3D Python application.
    They would probably not work for extremely accurate measurements, but I am able to control the pressure in the application with my fingertips quite well for my purposes.


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