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Frequency to Digital USB Output
Frequency to Analog Output
Unlike conventional resistive sensors based on either strain gauges or piezo-resistive
techniques, Loadstar’s breakthrough patented technology harnesses changes in
capacitance to measure loads quickly and accurately. In the Mini, the change in
capacitance is converted into a change in frequency of the output signal.
The load cell accepts a 5V DC input and outputs a TTL square wave whose frequency is
proportional to the applied load. Most data acquisition systems, microprocessors and
microcontrollers have the capability to measure the frequency of the signal. The iLoad Mini load cell has 2 frequency outputs. When Control Input = logic '1', the Mini outputs the sensor frequency, Fsensor. When Control Input = logic '0', the Mini ouputs the reference frequency, Fref. The compensated frequency Fcomp = Fsensor - K*Fref, where K is a constant provided by Loadstar. Loadstar provides the coefficients for the quadratic equation to translate Fcomp to load.
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