Interlink-electronics FSR 400 Series Bedienungsanleitung PDF herunterladen (Seite 27)

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FSR

Integration Guide

0 200 400 600 800 1000

FORCE (g)

(

)

7.5 k

4.7 k

2.5 k

1.5 k

FSR Current-to-Voltage Converter

In this circuit, the FSR device is the input of a current-to-voltage converter. The output of

this amplifier is described by the equation:















FSR

REFOUT

With a positive reference voltage, the output of the op-amp must be able to swing below

ground, from 0V to –VREF, therefore dual sided supplies are necessary. A negative

reference voltage will yield a positive output swing, from 0V to +VREF.





FSR

REFG

OUT







VOUT is inversely proportional to RFSR. Changing RG and/or VREF changes the

response slope. The following is an example of the sequence used for choosing the

component values and output swing:

For a human-to-machine variable control device, like a joystick, the maximum force

applied to the FSR is about 1kg. Testing of an example FSR shows that the

corresponding RFSR at 1kg is about 2.9k. If VREF is – 5V, and an output swing of 0V

to +5V is desired, then RG should be approximately equal to this minimum RFSR. A full

swing of 0V to +5V is thus achieved. A set of FORCE vs. VOUT curves is shown in

Figure 15 for a standard FSR using this interface with a variety of RG values.

ure 14: FSR Current-to-

olta

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 36 37

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