FlexiForce Pressure Sensor - 1lb.

This is a piezoresistive force sensor from Tekscan. The harder you press, the lower the sensor's resistance. Pressing lightly, the resistance changes from infinite to ~300k. The sensor itself is thin and flexible, but the resistance does not change while being flexed. Resistance changes only when pressure is applied to the round area at the end of the sensor. Used as a presence sensor (someone standing), weight sensor, pressure sensor (impact testing), etc.

The overall length is about 8.5". Sensor comes with 0.1" spaced, reinforced, breadboard friendly connector.

This sensor comes in three flavors. This sensor ranges from 0 to 1lb of pressure.

FlexiForce Pressure Sensor - 1lb. Product Help and Resources

Force Sensitive Resistor Hookup Guide

May 5, 2016

How to hook a force-sensitive resistor up to an Arduino to measure pressure variances.

Calibration

For information on how to calibrate your sensor go here => http://www.tekscan.com/how-do-i-calibrate-my-flexiforce-sensor.


Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

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Skill Level: Noob - You don't need to reference a datasheet, but you will need to know basic power requirements.
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Comments

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  • cbakeicecream / about 6 years ago / 1

    Is there another version of this without the long flex area? Can it be cut and new leads created?

  • Member #491544 / about 8 years ago / 2

    Would this be sensitive enough to sense an envelope?

  • T McGahee / about 7 years ago / 1

    Hey all, I made a guide on setting this up and calibrating it with an op amp and Arduino. The data is accurate, and it gives about 0.5 gram resolution on this sensor. http://www.seraphdrone.com/blog/flexiforce-pressure-sensor-with-arduino

  • Member #607568 / about 7 years ago / 1

    Is it accurate to measure 0-0.2 newton? And how to relate the output with force? Any Idea?

    • T McGahee / about 7 years ago / 1

      It doesn't do very well at little to no load, but you can pre-load it. If there is already 0.5lb on it, it will read 0.5-0.55 lb very accurately. Just subtract the 0.5lb to get the reading you're interested in.

      • Fraser / about 7 years ago / 1

        T - What about drift in this scenario? According to their documents drift is "<5% per logarithmic time scale (constant load of 90% sensor rating)". Would we need to then calibrate the device constantly as long as the pre-load is applied?

  • Member #600770 / about 8 years ago / 1

    Would this be able to sensor force less than 10gram? It is for a medical application that I'm looking for a sensitive one at very low pressure

  • Member #455754 / about 9 years ago / 1

    I want to measure the force being applied to a cable (imagine an old fashioned tug-o-war). Is there a mechanical way for one of these to do that? Is there a different product that would do the job better?

  • Member #142686 / about 10 years ago / 1

    I just received a few of these and had problems getting any data out of them at a force in the lower 5% of the range of the sensor. I connected it to the advertised OpAmp circuit and cranked up the gain, but nothing. No change in resistance at low forces. I called Tekscan (the manufacturer) and Dan, an engineer, explained that they do not work at a force less than 0.05lb. I'm not sure about any of their higher force models, but watch out for low ranges!

    ~Rich

  • MarkH / about 13 years ago / 1

    Are these water proof (below the connector of course)? Could I use one to measure the depth of water in a tank?

    • FlexiRyan / about 11 years ago / 1

      The sensors are only water-resistant, not waterproof. If you wanted to use these under water, you would need to completely seal the sensor (cover it entirely) with a sealant (one without acetic acid) or protect it with a poly bag.

  • DaveMonster / about 13 years ago * / 1

    is there an example circuit?

    • barnes / about 11 years ago / 1

      Late reply, but hopefully helpful to others;
      The sensor wants to be run through an op amp, look through the datasheet for example circuits.

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