Abstract
Piezoresistive force sensors exhibit considerable lower accuracy compared with load cells and force measuring systems based in strain gauges, however a new method for measuring forces using piezoresistive sensors is described in this paper, leading to a considerable increase in the repeatability of force readings. The new method consists of reading sensor's conductance and capacitance by applying DC and sinusoidal waveforms, thereby allow us to determine a multivariable estimation of force, instead of using the traditional, purely resistive model that has been used up to now. A study of sensor nonlinearities is also described which will allow us to determine the optimal setup to perform capacitance readings under sinusoidal excitation.
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