Simple pressure switches comprise transducers, comparators, and op amps. (circuits that condition pressure-transducer signals can change logic-level output when pressure is applied) From: EDN | Date: April 14, 1994| Author: | COPYRIGHT 1994 Reed Business Information. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information) Copyright information

Adding a few components to a circuit that conditions pressure-transducer signals enables the signal to change state when pressure crosses a threshold. This output can drive an LED, electronic switch or microcontroller input. The programmed threshold determines the pressure at which the output state switches. A user-defined hysteresis setting can be utilized to eliminate multiple output transitions when the pressure-sensor voltage is approaching the threshold. Motorola Inc's MPX2000 Series sensors are temperature-compensated pressure transducers with precisely trimmed offset and full-scale ...

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