Article: Simple pressure switches comprise transducers, comparators, and op amps. (circuits that condition pressure-transducer signals can change logic-level output when pressure is applied)

With a few added components, circuits that condition pressure-transducer signals can provide a logic-level output that changes state when a pressure crosses a threshold.

In concept, a pressure switch is simple. Its major subsystems are the pressure sensor, the signal conditioning (gain) stage, and output stages that employ comparator ICs and op amps. Just a few added components are necessary to let circuits that condition pressure-transducer signals deliver a logic-level output that changes state when a pressure crosses a threshold or thresholds. Such an output can drive an LED, a microcontroller input, or an electronic switch. The user-programmed threshold, ...

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