Micro power digital pressure gauge and pressure measuring method

Abstract

The invention discloses a micro power digital pressure gauge and a pressure measuring method, and belongs to the technical field of pressure measuring. The micro power digital pressure gauge comprises a data processing unit, a sensor unit and a power supply unit. The pressure measuring method comprises the following steps: (1001) a system is initialized; (1002) whether a level changes on a port RB5 or not is detected; (1003) a key is pressed to start scanning; (1004) whether the sleeping time is finished or not is detected; (1005) sleeping is retained; (1006) AD sampling is started; (1007) whether the sampling is finished or not is detected; (1008) AD data are read; (1009) a constant-current source is turned off; (1010) a calculation is carried out for calibration; (1011) whether the calibration is finished or not is detected; (1012) real-time pressure is displayed; (1013) whether an interrupt flag is 1 or not is detected; (1014) the interrupt flag is set to 0. The micro power digital pressure gauge is powered by a battery, so that long-distance cable pavement is avoided, and the micro power digital pressure gauge is especially applicable to occasions having no use for pressure teletransmission.

Description

technical field [0001] A micro-power consumption digital pressure gauge and a pressure measurement method belong to the technical field of pressure measurement. Background technique [0002] As a conventional instrument for measuring pressure, pressure gauges are widely used in various industries. At present, there are two main types of products for measuring pressure in industry. One is mechanical pressure gauge. The conversion mechanism of the movement transmits the pressure deformation to the pointer, causing the pointer to rotate to display the pressure; the other type is a pressure transmitter that outputs an industrial standard signal (such as a 4~20mA current signal), through the pressure sensor inside and the transmitter The circuit board cooperates to transmit the monitored pressure remotely in the form of electrical signals. The prior art mechanical pressure gauges and pressure transmitters each have their own drawbacks. [0003] The traditional mechanical press...

AI Technical Summary

Problems solved by technology

[0003] The traditional mechanical pressure gauge is limited by its structure. The pointer reading can only be used to estimate the reading. The error is large, which reduces the measurement accuracy. It cannot be used with overpressure. The mechanical parts are prone to fatigue and the service life is short, requiring regular professionals. Only maintenance can ensure its reliability, which virtually increases the cost

[0004] For pressure transmitters, it is mainly used in occasions that require remote transmission of pressure values. Although it has a digital tube or liquid crystal display, the 4~20mA signal output by the transmitter can only be transmitted to the central control room through cables. The upper computer in the control room converts and displays the pressure value, so in the actual site, the staff often cannot grasp the real-time pressure value immediately

In addition, the pressure transmitter needs an external DC power supply to power it when it is working, so it is not suitable for some occasions where the transmission output is not required and the laying of the line is not convenient, and it is largely restricted by the site conditions.

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