Flexiforce sensor

faisal

Hi there,

I am currently interfacing the flexiforce with and a/d converter.· The datasheet states that when no force is applied, the output voltage should be 0 volts and when 100 lbs is applied, the output voltage should be 4.2 volts.

I am getting 2.5 volts when no·force is·applied and 4.9 volts when·I apply a·about 5 kgs.· Should·I be using the excitation circuit shown in the data sheet or·should using just the a/d converter be·fine?

Any help would be·much appreciatted

·

steve_b

I tried using the sensor for some pressure measurements of some contact brushes (electrical slipring brushes).

I was just using a DMM to measure the resistance and found it was very hard to get repeatable results (so your mileage may vary).

The other thing the datasheet states is to "pre-load" or "condition" your flexiforce. I found this hard to do in a repeatable way....but this might help get things more stable for you (I just didn't have the right supplies to do this properly).

If you don't get 0Volts with no pressure applied, then you'll just have to scale from that.....of course, making sure that the bottom of your scale is the same voltage is somewhat important, so build that in to your code.

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<FONT>Steve



What's the best thing to do in a lightning storm? "take a one iron out the bag and hold it straight up above your head, even God cant hit a one iron!"
Lee Travino after the second time being hit by lightning!

faisal

Thanks for that steve