Interlink-electronics FSR 400 Series Manual de usuario descargar pdf (Pagina 23)

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FSR

Integration Guide

6.0 Measurement Techniques

6.1 Circuit

Voltage Divider

Figure 10: FSR Voltage Divider

FSR Voltage Divider

For a simple force-to-voltage conversion, the FSR device is tied to a measuring resistor

in a voltage divider (see figure below) and the output is described by the following

equation:



FSRM

OUT





In the shown configuration, the output voltage increases with increasing force. If R

FSR

and

are swapped, the output swing will decrease with increasing force.

The measuring resistor, R

, is chosen to maximize the desired force sensitivity range and

to limit current. Depending on the impedance requirements of the measuring circuit, the

voltage divider could be followed by an op-amp

A family of Force vs. V

OUT

curves is shown on the graph above for a standard FSR in a

voltage divider configuration with various R

resistors. A (V+) of +5V was used for these

examples. Please note that the graph values are for reference only and will vary

between different sensors and applications.

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Interlink-electronics FSR 400 Series Manual de usuario Pagina 23