JPS61260114A - Hydrobarometer - Google Patents

Abstract

PURPOSE:To obtain a reliable measuring instrument by providing a hydraulic-pressure detecting means, a water-depth value conversion means converting a signal from it into a digital water-depth value with a prescribed period, a preceding water-depth value storing means and an intermittent water-depth value storing means, etc. CONSTITUTION:A CPU 24 first gives a control signal to an A/D converter 22 with the prescribed period and converts an output signal of a hydraulic-pressure sensor 21 into the digital water-depth value which is inputted to an input port 23 and read and stored in a register in a RAM 24b as the preceding water-depth value. Then, the CPU 24 reads the digital water-depth value again and compares it with the preceding water-depth value and decides whether it is within the limits of a specified value. When a condition of YES is established, the sizes of the digital water-depth value and the preceding water-depth value are compared and when the digital water-depth value is larger, the condition of YES is established and the digital water-depth value is stored in a maximum value register in the RAM 24b. Then, the digital water-depth value is stored in the register as a new preceding water-depth value and further, displayed on a display device 27. Further, in case of NO, the measuring work is repeated again to calculate the accurate maximum water-depth value.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a water depth meter.

[Conventional technology]

In conventional water depth gauges, in order to store the maximum water depth value, a maximum water depth value storage means is provided, and the latest water depth value data input sequentially is compared with the data stored in the maximum water depth value storage means, and the latest water depth value is stored. When the value data is larger, the latest water depth value data is written into the maximum water depth value storage means as the maximum water depth value.

[Problem that the invention seeks to solve]

Conventional depth gauges have the following drawbacks:

First of all, when you jump into the sea, you experience a lot of water pressure.
Since the water depth value data at that time is stored as the maximum water depth value, a water depth value deeper than the actual water depth value is stored. A similar problem occurs when you scratch your arm while swimming underwater.

An object of the present invention is to provide a water depth meter that improves the above-mentioned drawbacks. .

[Means for solving problems]

The structure of the present invention for achieving the above object is as follows.

water pressure detection means, water depth value conversion means for converting a signal from the water pressure detection means into a digital water depth value at a predetermined period, previous water depth value storage means, maximum water depth value storage means, and maximum water depth value storage means. maximum water depth value setting means for comparing the stored data and the latest water depth value data and storing the latest water depth value data in the maximum water depth value storage means if the latest water depth value data is larger; and means for displaying the stored contents of the means, the maximum water depth value setting means.

Comparing the latest water depth value data with the data stored in the previous water depth value storage means, if the latest water depth value data is larger than a predetermined value, prohibiting writing of the latest water depth value data into the maximum water depth value storage means. The invention is characterized in that it includes a control means for controlling.

〔Example〕 The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a block diagram of the water depth meter according to the present invention.
is a water pressure detection means, which is composed of a diaphragm type semiconductor water pressure sensor, and outputs a water pressure signal. Reference numeral 2 denotes a water pressure value conversion means, which converts the water pressure signal from the water pressure detection means 1 into a digital water depth value at a predetermined period. Reference numeral 6 denotes the latest water depth value reading means, which inputs the digital water depth value of the water pressure value converting means 2.

4 is a previous water depth value storage means. 5 is a means of comparison,
The latest water depth value data of the latest water depth value reading means 3 is compared with the data stored in the previous water depth value storage means 4, and a control signal S1 is output. Comparison means 6 compares the latest water depth value data of the latest water depth value reading means 6 with data stored in the maximum water depth value storage means 8, which will be described later, and outputs a control signal S2. 7
is a maximum water depth value setting means and is equipped with a writing control means 7a, which inputs the latest water depth value data of the latest water depth value reading means B and also outputs a control signal 32. Under the control of the control signal S1, maximum water depth value data is selected from the latest water depth value data and stored in the maximum water depth value storage means 8.

9 is a display means, which displays the latest water depth value data from the latest water depth direct reading means B and the data stored in the maximum water depth value storage means 8 on a display device such as a liquid crystal display.

FIG. 2 is a circuit configuration diagram embodying the water depth meter shown in FIG. 1, and 21 is a water pressure sensor which outputs a signal corresponding to the water depth. 22 is an A/D converter, which is controlled by a CPU 24a (described later) via a signal line 28 at a predetermined cycle to convert the output signal of the water pressure sensor 21 into an A/D converter.
It is converted into a digital water depth value by D conversion, and outputted to the input boat 23.

24 is a well-known microcomputer, basically a CP
It is composed of O24a, PLAM24b, and RAM24b. A program for controlling the CPU 24a is written in the ROM 24C.

According to this program, the CPO 24a controls the input port 24 by controlling the A/D converter 22.
Arithmetic processing is performed by importing necessary external data from C or data exchange with the RAM 24b, and the processed data is output/output as necessary.
Output to outboard 25. Out party boat 2
Reference numeral 5 is composed of a latch circuit, which temporarily stores data from CP[J24a given via a signal line 26 and outputs it to a display device 27 such as a liquid crystal.

A flowchart of the program written in the ROM 24clC is as shown in FIG.

When the program starts, the CPU 24 first gives a control signal to the A/D converter 22 at a predetermined period via the signal line 28, inputs and reads the digital water depth value into the input 0 port (step ■), and stores the value in the register in the RAM 24b. 1 as the previous water depth value. (Step ■) Read the digital water depth value Dn again (Step ■) Compare it with the previous water depth value stored in register 1 and judge whether it is within the standard value range (Step ■). If the YES condition is met, , Proceed to step (2), compare the digital water depth value Dn with the previous water depth value stored in register 1, and when the digital water depth value Dn is large, the YES condition is satisfied,
Proceed to step 6 and store the digital depth value Dn in RAM2.4.
Store in the maximum value register in b.

Next, the digital water depth value Dn is stored in register 1 as a new previous water depth value (step ■), and then displayed on the display device (step ■), and the flow returns to step ■ again by reading the new water depth value Dn. Start. Also, if NO in step ■, return to step ■. Step ■
If the answer is No, go to step ■, display step ■, and return to step ■. Then, repeat steps ■ to ■ to find the accurate maximum water depth value.

As the wearer gradually descends as described above, the digital water depth value Dn in step (2) satisfies the YES condition in step (2) and is successively stored in the maximum value register in step (2). Also, when the person carrying the item comes to the surface, the NO condition is satisfied in step (2), and step (2) is not performed. Furthermore, when the user jumps into the sea, the digital water depth value Dn in step ■ suddenly becomes a large value, so the condition of NO is satisfied in step ■, so by not storing the digital water depth value Dn in the maximum register in step ■, Abnormal water depth values that occur when diving or arm-scraping are removed.

〔Effect of the invention〕

As described above, according to the present invention, a water depth value caused by sudden water pressure such as when diving into the sea is judged as an abnormal value and is not stored as a maximum water depth value, so that the true maximum water depth value actually dived can be stored. Therefore, it is possible to provide a reliable water depth meter.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a water depth meter according to the present invention, FIG. 2 is a circuit configuration diagram, and FIG. 3 is a flowchart # of water depth measurement. 1...Water pressure detection means. 2... Water pressure value conversion means, 7... Maximum water depth value setting means. 8... Maximum water depth value storage means.

Claims (1)

[Claims] water pressure detection means, water depth value conversion means for converting a signal from the water pressure detection means into a digital water depth value at a predetermined period, previous water depth value storage means, maximum water depth value storage means, and maximum water depth value storage means. maximum water depth value setting means for comparing the stored data and the latest water depth value data and storing the latest water depth value data in the maximum water depth value storage means if the latest water depth value data is larger; means for displaying the stored contents of the means, and the maximum water depth value setting means compares the latest water depth value data with the data stored in the previous water depth value storage means, and the latest water depth value data is larger by a predetermined value or more. In this case, the water depth gauge is characterized in that it includes a control means for prohibiting writing of the latest water depth value data into the maximum water depth value storage means.