Introduction: This paper designs an offshore liquid level measurement system based on AT89S51 single-chip microcomputer. The system adopts the principle of segmented capacitance detection to realize the detection of oil and water dual liquid levels. The hardware circuit of micro capacitance measurement is reasonably constructed. The system can be accurately applied to the measurement of offshore oil level. Square wave generating circuit.
This paper designs an offshore liquid level measurement system based on AT89S51 single-chip microcomputer. The system adopts the principle of segmented capacitance detection to realize the detection of oil and water dual liquid levels. The hardware circuit of micro capacitance measurement is reasonably constructed. The system can be accurately applied to the measurement of offshore oil level.
Square wave generating circuit
Figure 4 Square wave generating circuit
The multivibrator composed of NE555 is the square wave signal source measured by the diode AC bridge, and its specific circuit is shown in Figure 4. The frequency calculation is shown in the figure.
Let 
, 
, 
, then: 
. Therefore, NE555 can provide a square wave signal source with a voltage amplitude of 5V and a frequency of 500kHz for the capacitance detection circuit.
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