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Description: A simple flex sensor 2.2" in length. As the sensor is flexed, the resistance across the sensor increases. Patented technology by Spectra Symbol - they claim these sensors were used in the original Nintendo Power Glove. I love the Nintendo Power Glove. It's so bad!

The resistance of the flex sensor changes when the metal pads are on the outside of the bend (text on inside of bend).

Connector is 0.1" spaced and bread board friendly.  Check datasheet for full specifications.

Note: Please refrain from flexing or straining this sensor at the base. The usable range of the sensor can be flexed without a problem, but care should be taken to minimize flexing outside of the usable range. For best results, securely mount the base and bottom portion and only allow the actual flex sensor to flex.

Documents:

Comments 19 comments

  • Lucas Barton would approve.

  • Is it bi directional?

  • Hello, are sent to Argentina? the cost is in dollars? thanks, sorry for the ignorance, I’m new.

  • Nice instructable on how to build these at http://www.instructables.com/id/How-to-Make-Bi-Directional-Flex-Sensors/

  • Hi, can this sensor be flexed of 180 degrees without taking damages?

    • At 180 degrees, you are going to be bending the sensor at the base, which will have a negative affect on the functionality of the sensor and may damage it, so I wouldn’t suggest it.

  • can this flex force be used in an insole gait monitoring system for a person with a weight of 65Kg

  • Good sensor but would be better if they all come in at the same resting value.

    You have to be careful soldering wires to them , Just solder to the tabs that stick out, from the sensor, otherwise they have a tendency to go open circuit.

  • Cool product. I was just going to make a videogame controller glove, and I though flex sensors would work best. It’s funny to see it’s already been done in the exact way I had planned my own project!

  • Hmmm, the datasheet says 25K to 125K ohms, the Quickstart says 30K to 50K, the Oomlaut Project says 10K to 35K and the one I got is 18.5K to 21.5K and not very consistent. It doesn’t seem to be a very reliable component.

  • These have exactly the same design flaw as the 4.5" sensors: Even though they are flex sensors the area between the pins and the sensor is incredibly susceptible to flex damage where the Kapton traces lift or wear. We went through a few of these before we finally reinforced the connection area enough to get over 1000 cycles, much less the >1 Mil that the data sheet claims. (Look at the photo of the back to see the area where the sensor reinforcing stops more than 1cm before the connector.)

    • Any component that undergoes routine physical contact should have some sort of strain relief E.G., Phono plugs, power cables that traverse casing walls, Piezo Vibration Sensor sku: SEN-09196, etc.

      • Yep, exactly. It is up to you to provide your own strain relief.

      • This product does include strain relief, however it does leave an area between the connector and the sensor vulnerable. Again, not something a hobbyist would expect in something labeled “flex sensor”.
        Reading the number of commends around the ‘net plenty of other people have had the same issue and ruined their otherwise excellent sensors as a result. Seemed fair to provide a warning here.
        It’s -not- a warning to avoid the sensors (quite the opposite) but to take extra care when using them.

        • Fair enough. But at the same time, we’ve sold thousands of these and only a handful of issues. But, yes, they can be fragile if used in certain circumstances.

        • Most devices out on the market, excluding external connectors (phono plugs etc…), will not come with any type of strain relief as the assumption by the components manufacturer is that it (the component) is being sold in bulk to a OEM (original equipment manufacturer) who will engineer the casing and any strain relief necessary to keep the end user from destroying the device under normal use.
          The spec diagrams show both a part length and an active length. The active length does have some reinforcing but it is not an actual strain relief. The strain relief design, as hinted at above, is usually use specific and will vary due to application, casing and physical electrical connection. You sometimes learn such things in design classes.
          In this case the reinforcing should be clamped to some part of the case the PCB is mounted in.
          Rule of thumb, take a long look at any device that will move or be manipulated by the end user. Look for the weak link in its design, then look for ways to brace/connect it to the casing or PCB other than its electrical connections.


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