JP2904477B2 - How to read barometric pressure in weather forecast - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barometer used for a clock body or the like for displaying a simple weather forecast by measuring the barometric pressure called a weather clock. It relates to a reading method.

[0002]

2. Description of the Related Art Today, clocks and wall clocks, which are referred to as weather clocks and display simple weather forecasts such as "rain", "sunny" and "cloudy", are widely used. This weather clock measures the air pressure using a simple barometer every predetermined time, and displays "sunny" when the air pressure is high, displays "rain" when the air pressure is low, "Sunny" when climbing
Is displayed in the form of a weather forecast that predicts a predetermined weather based on the measured atmospheric pressure, such as one that displays "rain" when the atmospheric pressure drops.

As a barometer used for measuring the barometric pressure, a mechanical barometer which has been used for a long time is often used. In recent years, a semiconductor barometer has been used in place of a mechanical barometer. It has become This mechanical barometer detects the change in air pressure by expanding the amount of deformation of the depressurized sealed container with an arm or the like, and the semiconductor pressure sensor measures the amount of deformation of the depressurized container by using a piezoresistive element or the like. A device that detects and outputs a pressure and measures the atmospheric pressure is often used.

[0004]

The above-mentioned barometer incorporated in a weather clock or the like generally has a simple structure such as a mounting structure, and a mechanical barometer has a drawback that it is weak against shock and vibration. Further, the barometer of the semiconductor pressure sensor type has an advantage that it can be smaller than a mechanical barometer, but has a disadvantage that it is easily affected by air vibration such as loud noise and measurement errors are apt to occur.

[0005] The present invention, discharge such drawbacks, there is provided a method capable of accurately measuring the pressure by a simple barometer.

[0006]

According to the present invention, a semiconductor pressure sensor is used to measure air pressure at predetermined time intervals, and a plurality of measured values are averaged to obtain a detected value. When they match, this detected value is read as atmospheric pressure data. Then , the atmospheric pressure is measured at predetermined time intervals, and when the averaged detection value is different from the previous detection value, a plurality of measurements are similarly performed at a time interval shorter than the predetermined time to obtain a new detection value. it is an air pressure data when a match with the detected value.

[0007]

[Function] The present invention uses a semiconductor pressure sensor, is resistant to shocks, and the average of measured values is used as a detected value.
Since the influence of noise such as sound can be reduced, and the data that matches the previous detection value is used as the atmospheric pressure data, the value when the same detection value is observed twice consecutively is used as the weather forecast data. Can be.

[0008] Then, since the detection value is determined again detected value measured at a time interval shorter than the predetermined time when the different from the previous, obtains a detection value at longer intervals when there is no change in the atmospheric pressure, when the atmospheric pressure changes Can newly obtain a detection value at short intervals and take in the atmospheric pressure data.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for reading atmospheric pressure according to the present invention is a table clock capable of displaying "rain", "sunny" or "cloudy", which has a semiconductor pressure sensor inside and a microcomputer. The present invention is implemented in a weather clock that predicts tomorrow's weather on a weather display unit based on a pressure signal from a pressure sensor.

This reading method is, as shown in FIG.
After applying the power supply voltage to the semiconductor pressure sensor, wait for a while until the output of the semiconductor pressure sensor is stabilized so as to stop reading the sensor output, and then read the measured value after the output of the semiconductor pressure sensor is stabilized. Things,
In the measurement of the atmospheric pressure, which is the reading of the measured value, the output of the atmospheric pressure sensor is read, for example, every 5 minutes, and the pressure is measured at predetermined time intervals. By doing so, an average value is calculated from a plurality of measured values, and this average value is used as a detection value.

The detection value is stored once and compared with the previous detection value. Similarly, the required number of measurements are measured at predetermined time intervals and averaged to obtain the detection value. When the detected value matches the previous detected value, the detected value is used as atmospheric pressure data and a forecast is displayed on the display unit based on the detected value, and the detected value is stored and measured again to perform detection. The measurement of the required number of times for obtaining the value and the calculation of the average value are repeatedly performed.

When the detected value obtained by the measurement does not coincide with the previous detected value, a value obtained by averaging a plurality of required measured values as new detected values is stored, and the measurement is repeated again to obtain the detected value. If the detected value obtained one time ago and the latest detected value obtained by re-measurement are compared and coincide with each other, a weather forecast is displayed based on the latest detected value. Only when the detection value obtained last time and the latest detection value match, this detection value is stored for comparison with the next detection value while using the detection value as atmospheric pressure data for forecasting.

The first detection value is compared with a preset value or the like, and this detection value is not converted to atmospheric pressure data because the value does not match in the comparison with the previous detection value. Will be measured. And in this embodiment, when the new detection value is different from the previous detection value,
When the new detection value is stored and the required number of measurements are performed again, the measurement interval is set to a time interval shorter than a normal predetermined time interval, for example, one minute, and the measurement is performed the required number of times to obtain the detection value. When the new detection value matches the previous detection value, the measurement interval is returned to a predetermined time interval such as 5 minutes, and the first detection value is obtained by starting the first measurement. In this case, set a short measurement time interval such as 1 minute when the sensor power is turned on.
When obtaining the first measurement value, the measurement interval can be measured as a time interval shorter than the predetermined time interval.

As described above, in this embodiment, since the atmospheric pressure is measured at predetermined time intervals and a plurality of measured values are averaged to obtain a detected value, the possibility of picking up noise due to air vibration such as sound is reduced. At the same time, by averaging, the influence of noise can be reduced and pressure data with less measurement error can be obtained.A detected value that matches the previous detection value is used as pressure data, and the pressure change that gradually changes over time Measurement can be used to obtain data for forecasting.

The predetermined time interval for performing the measurement is not limited to 5 minutes, but is set to a predetermined interval every 2 to 3 minutes or every tens of minutes, and the number of measured values for obtaining the detected values is not limited to 12. By averaging dozens of measured values, such as 7 to 8 or 30, to obtain measured values, and calculating detection values every tens of minutes to about 2 hours, it is possible to sufficiently grasp and detect normal atmospheric pressure changes Can be done.

That is, if the measurement is performed every few minutes, the measurement is extremely short, so that the possibility of being affected by noise is reduced, and a gradually changing pressure change can be detected. By averaging the measurements of about 10 to 30 times, even if the measurement of the atmospheric pressure including the measurement error affected by the noise is included, the influence of the measurement value including the measurement error is included. Can be reduced,
Normally, a gradually changing pressure change can be appropriately measured.

Further, in this embodiment, when the new detected value is different from the previous detected value, the interval at which the measurement is performed is shorter than the predetermined time interval which is a normal measurement interval. The pressure value to be used as pressure data can be calculated and measured in a relatively short time with the interval for obtaining the detection value being about 10 minutes to several tens of minutes. , The atmospheric pressure data can be normally obtained in units of time.

[0018]

According to the present invention, since the semiconductor pressure sensor is used, it is resistant to vibrations such as shocks, and the measured values at predetermined time intervals are averaged to obtain detection values. Atmospheric pressure measurements can be made. Furthermore, a new detection value matching the detected value of the previous and pressure data, from the detection value when different from the detection value of the previous measuring again detected value by shortening the measurement interval, when the pressure is changed short Measurement can be performed accurately over time, and when there is no change, measurement can be performed in units of time . Therefore , when the atmospheric pressure changes suddenly, while detecting the change in a short time, the atmospheric pressure data is usually obtained in units of time, and a measurement method suitable for detecting the atmospheric pressure change necessary for a simple weather forecast. It can be.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a measuring method according to the present invention.

Claims (1)

(57) [Claims] An air pressure is measured at predetermined time intervals using a semiconductor air pressure sensor, and an average value obtained by averaging a plurality of measured values is used as a detected value. When a new detected value matches the previous detected value, Reading new detection values as barometric pressure data
If the averaged detection value is different from the previous detection value,
Similarly, perform multiple measurements at shorter time intervals than the specified time.
To obtain the detection value again, and the latest detection value is
A barometric pressure reading method for a weather forecast, wherein the barometric pressure data is used when the values match .