If you want to create a control voltage with an FSR, or send its signal to the ADC on a microcontroller, there are a couple of options. The first is shown on the left of Figure 7 below. This is a standard voltage-divider configuration, with the FSR acting as one of the resistors. You can place the FSR on the top of the divider if you want the voltage to increase with pressure, or at the bottom if you want the voltage to decrease. A simple op-amp follower is shown on the right of Figure 7, which will keep the FSR output consistent and buffer the signal for driving smaller loads. You can also put gain in this op-amp if you want to increase the output swing of the FSR signal.