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I don't understand what you mean.
The kit can be purchased here:http://www.imagesco.com/science/high-voltage/high_voltage_devices.htmlTo purchase the board alone you need to contact the supplier directly.
That's a good idea.
If you build this device, please let me know your results.
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These type of sensors that I know about including this one:https://www.sparkfun.com/products/8606Are resistive. The parameters to measure are changes in resistance in relationship to the degree of bending. With the DIY sensors the in-group variance will be greater than with the commercial sensors.
Please let me know which commercial bi-directional sensor you are referring too.
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It can, but it becomes easier for the two copper foils to touch and short the sensor out.
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Yes, I am the author of the book also.
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Technically you can use any conductive material such as aluminum foil. The difficulty is that it is difficult to solder to aluminum and without the conductive foil having a plastic laminate base the foil will deteriorate pretty fast when used.
Usually , yes.John