Square fsr differences between versions

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clocksclicks
 
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Square fsr differences between versions

Post by clocksclicks »

I have seen https://www.adafruit.com/product/1075 changed the square fsr that they are selling. This was the old one:
https://cdn-shop.adafruit.com/product-f ... ayout2.pdf

and that is the new one:
https://cdn-shop.adafruit.com/product-f ... asheet.pdf

how much difference if at all there is between those two version for human touching applications? Do I gonna notice a difference?

Thanks

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Re: Square fsr differences between versions

Post by adafruit_support_mike »

The older version had a slightly wider range: 100g-to-10kg (1:100), while the new ones span 100g-to-5kg (1:50).

Beyond that, there wouldn't be much difference in their general behavior. For any kind of accuracy, you'll need to calibrate the sensor for at least two different load values.

https://learn.adafruit.com/calibrating- ... alibration

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Re: Square fsr differences between versions

Post by clocksclicks »

Thanks for your reply.

It written in the data sheet that the old version have a range of 0.1Newton to 100Newton so the lower range is from 10gram and not 100 gram. how much of a difference it is?

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Re: Square fsr differences between versions

Post by adafruit_support_mike »

Good catch.

0.1N is the amount of force produced by 10.2g at 1g of acceleration. 10N is the force produced by 1.02kg under 1g of acceleration.

So the new FSR's low end sensitivity is about 1/10th the old one's and its high end sensitivity is about 1/5th the old one's.

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Re: Square fsr differences between versions

Post by clocksclicks »

So we can say the new one has much less precision in comparison to the old one...

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Re: Square fsr differences between versions

Post by adafruit_support_mike »

No. Precision describes the amount of variation when a device measures the same thing several times.

Four major properties of measurement are accuracy, precision, range, and resolution.

- Accuracy describes how well the measurement system's output matches the real value of the thing being measured.

- Precision describes the amount of variation among several readings of the same thing.

- Range describes the smallest and largest values the system can measure.

- Resolution describes the smallest change the system can measure.

From the information in the datasheet we can say the new FSR's range begins at a lower value than the old one, ends at a lower value than the old one, and the ratio of smallest to largest values is half that of the old one.

Since the low end of the new FSR's range is smaller than the old one's, you could say the new sensor has better low-end resolution than the old one.

Both sensors produce continuous values, so there's no way to say one sensor's resolution is better than the other. In addition, FSRs have fairly low precision and accuracy, so it's hard to associate a detectable change in the output with a specific measured value.

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Re: Square fsr differences between versions

Post by clocksclicks »

Thanks for your detailed answer.
I ordered few of the new ones. Can't wait to test them out!

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