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555 pressure sensing digital circuit

2015-01-27 16:05  
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555 pressure sensing digital circuit
The RX on the figure 8-48 represents the pressure sensor. The Rx changes in proportion with the voltage's change. Taking it as the part of the multivibrator's time constant. The 555 oscillator's frequency: f=1.44/(R1+RX+2R2)C1. Its charge time which means outputing high power level time: t=0.693(R1+R2+RX)C1. we can find the t's big/small is relation to the Rx.