CN204128735U - One locates barograph automatically - Google Patents

Abstract

The utility model discloses an automatic positioning air pressure instrument, which comprises an air pressure acquisition module, a GPS module, a data processing module and a display module. The automatic positioning barometer of the utility model can not only measure air pressure, but also accurately display azimuth information, and has the characteristics of high measurement accuracy, convenient and accurate reading, and convenient portability.

Description

An automatic positioning barometer

technical field

The utility model relates to the technical field of air pressure measuring devices, in particular to an automatic positioning air pressure instrument.

Background technique

The air density is different in different layers on the earth, the air density near the surface layer is higher, and the air far away from the surface layer is thinner and has a lower density. High-pressure air is caused by gravity. In high-altitude areas, the height of the air column is small and the density is low, so the higher the altitude, the lower the atmospheric pressure. Although the traditional mechanical barometer has stable performance and high measurement accuracy, it cannot automatically record the air pressure information and the process of air pressure changes, and this type of barometer is too large to move frequently, adjust the measurement location, and cannot automatically record the air pressure when measuring the air pressure. The output air pressure value needs to be calculated to obtain the actual air pressure value, but the accuracy of the air pressure value obtained at this time is not high, and the error is relatively large, which is easily affected by the environment. With the improvement of meteorological observation requirements, the requirements for air pressure measuring instruments are also getting higher and higher. At present, the air pressure measurement function of automatic weather stations is also limited by the fact that automatic weather stations have to measure many meteorological elements and the allocation of hardware resources is limited. The functions of barometric pressure measurement and information processing and other extended functions are provided. Both of these air pressure measuring devices are not suitable for application on mobile carriers.

In addition, with the development of the times, people's research on things is getting deeper and deeper, and the requirements for data are more stringent, so high-precision digital instruments are needed. Of course, digital barometer technology has become an important technology in the field of air pressure. It has good applications in many aspects. For example, in industrial production, the air pressure in a sealed space can be measured to ensure the safety of the workshop and employees; in meteorological observation, the air pressure value at any time can be measured with a barometer. Thereby it is convenient to grasp the air pressure situation at any time.

Contents of the invention

The purpose of this utility model is to provide an automatic positioning barometer aiming at the deficiencies in the above-mentioned prior art.

The purpose of this utility model is achieved by the following technical solutions:

An automatic positioning barometer, comprising an air pressure acquisition module, a GPS module, a data processing module and a display module; the data processing module is connected with the air pressure acquisition module, the GPS module and the display module respectively;

The air pressure acquisition module is used to collect ambient air pressure, and the air pressure value is passed to the data processing module;

The GPS module is used to determine the measurement position and transmit the positioning information to the data processing module;

The data processing module is used to receive the air pressure value and positioning information, and after processing and analyzing, transmit the air pressure value and the longitude and latitude information of the measurement position to the display module;

The display module is used to display the air pressure value and the latitude and longitude information of the measurement location.

The automatic positioning barometer also includes an alarm circuit and a setting button module, the alarm circuit and the setting button module are connected with the data processing module, and are used for alarm prompting and setting circuit alarm threshold respectively.

The air pressure acquisition module adopts a BMP085 pressure sensor, and the data processing module adopts an AT89S52 single-chip microcomputer.

The utility model has the following outstanding beneficial effects:

The automatic positioning air pressure instrument of the utility model is controlled by an AT89S52 single-chip microcomputer, and is connected with a GPS module. Also has very convenient portability. In industrial production, the air pressure in a sealed space can be measured to ensure the safety of workshops and employees; in meteorological observation, an automatic positioning barometer can be used to measure the air pressure value at any time and the location information of any place, so that it is convenient to grasp at any time Measure the air pressure at the location. In addition, hardware expansion can be realized by adding wireless transmission circuits, and the expanded self-positioning barometer can be connected to the wireless sensor network as an air pressure sensing device to form a multi-point air pressure sensing system. Compared with ordinary barometers, it has the characteristics of easy selection of measurement placement, high measurement accuracy, convenient and accurate readings, low power consumption, good mobility, and easy portability. Combined with GPS positioning function, it is very suitable for vehicle-mounted and ship-borne air pressure measurement .

Description of drawings

Fig. 1 is a block diagram of the utility model;

Fig. 2 is the air pressure acquisition circuit diagram in the utility model;

Fig. 3 is the GPS positioning circuit diagram in the utility model;

Fig. 4 is the minimum system diagram of the single-chip microcomputer in the utility model;

Fig. 5 is the alarm circuit diagram in the utility model;

Fig. 6 is the setting button module circuit in the utility model;

Fig. 7 is a circuit diagram of the liquid crystal display in the utility model.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

Referring to Fig. 1, a kind of automatic positioning barometer in the utility model, comprises air pressure acquisition module 1, GPS module 3, data processing module 2, display module 4, alarm circuit 5 and setting button module 6.

The air pressure acquisition module 1 is used to collect ambient air pressure information, and transmit the collected air pressure signal to the data processing module 2 . Air pressure acquisition module 1 adopts BMP085 pressure sensor, which has the advantages of high precision, low energy consumption, strong mobility, the minimum accuracy that can be measured is 0.03pa, and the power is only 3uW. BMP085 pressure sensor contains resistive pressure sensor, A/D converter, control unit EEPROM and I2C bus. The measured air pressure information is transmitted to data processing module 2 after the built-in A/D conversion in BMP085. After the air pressure value measured by the air pressure sensor is converted by the internal A/D, the result is read from the I2C port and sent to the data processing module 2 through the pins SDA and SCL. Air pressure acquisition circuit shown in Figure 2.

The GPS module 3 is used to determine the measurement position and transmit the positioning information to the data processing module 2 . The GPS module 3 circuit is shown in Figure 3. GPS module 3 is connected with P3.0 and P3.1 of AT89S52 single-chip microcomputer through RXD and TXD pins, so as to transmit the positioning information to the single-chip microcomputer. While obtaining and displaying air pressure information, the single-chip microcomputer can also accurately display the longitude and latitude information of the air pressure measurement location.

The data processing module 2 adopts AT89S52 single-chip microcomputer to receive the air pressure value and location information, and after processing and analyzing, transmit the air pressure value and the latitude and longitude information of the measurement position to the display module 4. The minimum system components of the AT89S52 microcontroller include three parts: power circuit, clock circuit and reset circuit. The minimum system circuit diagram of the single-chip microcomputer is shown in Figure 4. The power supply circuit is used to supply power to the single-chip microcomputer, usually +5V DC power is added to the single-chip microcomputer; the clock circuit is an oscillating circuit, which is supplied to a sine wave as a reference, and is used to determine the execution speed of the single-chip microcomputer; the reset circuit is used to determine the starting point of the single-chip microcomputer. The initial state, so as to realize the start-up process of the single-chip microcomputer. The utility model realizes the start of the single-chip microcomputer through the manual button S1) in Fig. 4 .

The alarm circuit 5 and the setting button module 6 are connected with the data processing module 2, and are used for alarm prompting and setting circuit alarm threshold respectively. Alarm circuit 5 is made of buzzer, triode and LED indicator light. When the air pressure measurement value of the pressure sensor BMP085 exceeds the preset threshold, the microcontroller outputs a high level through P3.4, the triode is turned on, and a current is generated, the current flows through the coil, and the buzzer sounds an alarm. The alarm circuit 5 is shown in Figure 5. The triode in the circuit plays the role of amplifying the current, because the TTL level output by the single-chip microcomputer cannot drive the buzzer, so a current amplifying circuit is needed, here a triode is used to amplify the current to drive the buzzer machine work. The circuit of the setting key module 6 is shown in Figure 6. S2 is connected to P1.0 of the single-chip microcomputer, which is the adjustment key of the alarm air pressure value. Press it once to enter the setting of the alarm air pressure value, and the alarm flashes at this time; S3 is connected to P1.1 of the single-chip microcomputer. The key is a decrease key, press it once to decrease 1; S4 is connected to P1.2 of the single-chip microcomputer, the key is an increase key, press it once to increase 1, and then press the adjustment key again to display normally. Although the basic functions of the automatic positioning barometer can be basically realized without the alarm circuit 5 and the setting button module 6, the alarm circuit 5 and the setting button module 6 enhance the practicability and convenience of the automatic positioning barometer.

The display module 4 is used to display the air pressure value and the longitude and latitude information of the measurement location. The display module 4 circuit is connected by the pins of the LCD1602 liquid crystal display and P0.0~P0.7 of the AT89S52 single-chip microcomputer. After the air pressure information measured by the pressure sensor BMP085 and the position information obtained by the GPS positioning module are processed by the data processing module 2 single-chip microcomputer, can be displayed on the LCD screen. The display circuit is shown in Figure 7. The automatic positioning air pressure instrument of the utility model has high measuring precision, the air pressure resolution can reach 0.03hPa, the height noise (jump) is only 0.25m, and the electrode consumption is low, only 3μA.

The above are the preferred embodiments of the utility model, and all changes made according to the technical solution of the utility model, when the functional effect produced does not exceed the scope of the technical solution of the utility model, all belong to the protection scope of the utility model.

Claims (3)

1. An automatic positioning barometer, characterized in that it comprises an air pressure acquisition module (1), a GPS module (3), a data processing module (2) and a display module (4); the data processing module (2) is connected with the The air pressure acquisition module (1), GPS module (3) and display module (4) are connected. 2. The automatic positioning barometer according to claim 1, characterized in that it also includes an alarm circuit (5) and a setting button module (6), and the alarm circuit (5) and the setting button module (6) are connected with The data processing module (2) is connected and used for alarm prompting and setting circuit alarm threshold respectively. 3. The automatic positioning barometer according to claim 1 or 2, characterized in that, the air pressure acquisition module (1) adopts a BMP085 pressure sensor, and the data processing module (2) adopts an AT89S52 single-chip microcomputer.