Pressure sensitive conductive sheet

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sunnyred
 
Posts: 1
Joined: Thu Feb 20, 2014 4:43 pm

Pressure sensitive conductive sheet

Post by sunnyred »

Hi,

I just purchased your pressure-sensitive conductive sheet (Velostat/Linqstat) for our design project.
We would like to use this material as a glove switch that can tell us when user touch the wheelchair push-rim.
When we measured it's resistance, we noticed the resistance change continually.
For example, first day I measured the resistance during resting is 200 ohm and 150 ohm when I touched. but the second day the resistance is 400 ohm during resistance and 320 ohm when I touched. Could you explain why this happen? Since we would like to define a threshold that can tell us when subject touch the push-rim, we need a reliable value to do so.

Besides, since we are going to connect this glove to our Labjact system, which has 5v output and analog input. I'm wondering do you still suggest us to use your wearable electronic platform (arduino-compatible)?

Thanks for your help,

Ray

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adafruit_support_mike
 
Posts: 67454
Joined: Thu Feb 11, 2010 2:51 pm

Re: Pressure sensitive conductive sheet

Post by adafruit_support_mike »

The resistive properties of velostat are a side-effect of how it's made, not a feature whose performance is specified. If you need repeatable performance you'd be better off using a real force-sensitive resistor:

http://www.adafruit.com/products/166
http://www.adafruit.com/products/1071
http://www.adafruit.com/products/1075

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