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How piezoelectric sensors work and how to use them #Sensors #Wearables @kobakant

The How to Get What You Want site presents another interesting tutorial on piezoresistive sensors, various techniques to lay them out, and how to interface them to microcontrollers.

In this post I want to try and explain how a pressure matrix built from conductive rows and columns with a piezoresistive material (Eeonyx, velostat) in between works, how to wire it up to a microcontroller and write the Arduino code that will parse through the rows and columns to read the individual pressure points at each row/column intersection.

1) how a piezoresistive pressure sensor works
2) wiring matrix to arduino
3) the matrix code

The article uses some excellent Flickr drawings to illustrate piezoelectric properties.

Piezo/resistance

And how sensors may be woven to form a matrix

See the full article here and a demonstration video below.

 


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