The symbol Rx in the figure represents the pressure sensor. As the pressure changes, the resistance of Rx changes proportionally. It is used as part of the time constant of the 555 multivibrator. The 555 oscillator frequency f=1.44∕(R1+Rx+2R2) C1, wherein the charging time, that is, the output high level time t is charged to 0.0063 (R1 + R2 + Rx) C1, and it can be seen that the size of the charge is related to Rx. The figure shows the circuit diagram of the pressure sensing digital meter.
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