Hi, I am a hobbyist looking to design a project which incorporates a pressure sensitive pad. The pad would give an output proportional to the weight bearing down on it. Can anyone suggest the type of sensor/transducer which may be used. Thanks, Ian Scotland
pressure/force transducer
Nov 05, 2007
7 Replies
http://www.google.com/search?hl=en&rls=GFRC,GFRC:2006-50,GFRC:en&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=pressure+sensitive++resistor&spell=1
Electronic weigh scales use the pzieo electric effect and are cheap and common. Ken
Load cell + signal conditioner, but probably too much scratch for a hobbyist.
Best regards, Spehro Pefhany
"it\'s the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
Google "strain gauge".
Paul Hovnanian paul@hovnanian.com
-----------------------------------------------------------------------
Procrastinators: The leaders for tomorrow.
Are they really pzieo? I thought they only worked on changes in size rather than absolute position.
When I was a kid, by dad gave me a block of stuff and a neon bulb. With a pair of pliers (and cardboard insulators) you could make the light blink.
I remember squeezing like mad (turning blue etc) and nothing happened. Then somebody told me or I figured out that it needed a change rather than steady state force. Yup, now it was easy.
These are my opinions, not necessarily my employer\'s. I hate spam.
The piezoresistive effect (change in resistance with deformation) is affected by absolute deformation. The piezoelectric effect requires changing deformation.
It's the former which is used in strain gauges and load cells.
Thanks for the heads up and the spelling correction. This has an interesting cartoon,
formatting link
Ken
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required