en:aws
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en:aws [2014/08/18 18:03] – fluktuacia | en:aws [Unknown date] (current) – external edit (Unknown date) 127.0.0.1 | ||
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- | ====== Automatic weather station | + | ====== Automatic weather station |
- | An autonomous | + | An autonomous |
Very common problems of such applications are scarce energy resources and a need for short-term data transmission occurring after long time intervals. As a result, a possibility of immediate failure report via short-band data channel is essential in order to minimize dropouts in data acquisition. | Very common problems of such applications are scarce energy resources and a need for short-term data transmission occurring after long time intervals. As a result, a possibility of immediate failure report via short-band data channel is essential in order to minimize dropouts in data acquisition. | ||
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Apart from these technically still unsolved problems, there are other reasons to design such station - most notably an absence of serious OpenSource-hardware solution for meteorological data collection providing data for [[http:// | Apart from these technically still unsolved problems, there are other reasons to design such station - most notably an absence of serious OpenSource-hardware solution for meteorological data collection providing data for [[http:// | ||
+ | |||
+ | ===== Sensor construction ===== | ||
+ | |||
+ | V této verzi stanice bylo ustoupeno od pokusů používat standardní komerční snímače vesměs uzpůsobené k vestavění do konkrétní proprietární meteostanice daného výrobce. Místo toho jsou navrhovány vlastní konstrukce snímačů a jejich zakrytování. | ||
+ | |||
+ | ==== Stevenson Screen ==== | ||
+ | |||
+ | Prvním navrženým snímačem je radiační štít tisknutelný na 3D tiskárně. | ||
+ | |||
+ | {{ : | ||
+ | {{ : | ||
+ | |||
+ | |||
+ | === Ultrasound anemometer === | ||
+ | |||
+ | * http:// | ||
+ | * http:// | ||
+ | |||
+ | ====== Automatická meteostanice AWS01B ====== | ||
+ | |||
+ | Tato konstrukce využívá meteorologická čidla ze stanice wh1080. | ||
===== Sensors ===== | ===== Sensors ===== | ||
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* Freezing | * Freezing | ||
* Limit to the mximum measured wind speed | * Limit to the mximum measured wind speed | ||
- | * (([[http:// | + | * Seizing up (([[http:// |
- | Solvable by using other technologies | + | Solvable by using other anemometer designs |
==== Wind direction ==== | ==== Wind direction ==== | ||
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{{: | {{: | ||
- | Weather vane with wind rose serves as the most basic detector. The position of the vane is read by a reed switch and it is recorded when changes. | + | Weather vane with wind rose serves as the most basic wind detector. The position of the vane is read by a reed switch and it is recorded when it changes. |
=== Common difficulties === | === Common difficulties === | ||
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- | Can be solved by using more sophisticated anemometer that measures vector | + | Can be solved by using more sophisticated anemometer |
==== Precipitation ==== | ==== Precipitation ==== | ||
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==== Snow precipitation ==== | ==== Snow precipitation ==== | ||
- | According to demands | + | According to requirements |
=== Height === | === Height === | ||
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==== Humidity ==== | ==== Humidity ==== | ||
- | Humidity sensors are positioned | + | Humidity sensors are located |
[[cs: | [[cs: | ||
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==== Temperature ==== | ==== Temperature ==== | ||
- | Measuring the temperature of air, although being one of the most important function of the station, is in some cases performed incorrectly - e.g. by letting the Sun influence the value. A solution to this problem is so-called radiation shield, which prevents the effect of radiation on the sensor. | + | Measuring the temperature of the air, although being one of the most important function of the station, is in some cases performed incorrectly - e.g. by letting the Sun influence the value. A solution to this problem is so-called radiation shield, which prevents the effect of radiation on the sensor. |
- | Apart from commonly used [[cs: | + | Apart from commonly used [[cs: |
==== Pressure ==== | ==== Pressure ==== | ||
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=== Luminous flux === | === Luminous flux === | ||
- | Use of photovoltaic cell, measuring output in W/ | + | Use of a photovoltaic cell, measuring output in W/ |
=== UV index === | === UV index === | ||
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==== Chemical sensors ==== | ==== Chemical sensors ==== | ||
- | * Gas detection CO, CO2, N2... H2S, CH4.. [[http:// | + | * Gas detection CO, CO2, N2... H2S, CH4.. [[http:// |
* PH-meter | * PH-meter | ||
===== Communication interface ===== | ===== Communication interface ===== | ||
- | The weather station has several possibilities | + | The weather station has several possibilities |
==== RS232/RS485 ==== | ==== RS232/RS485 ==== | ||
- | Modules | + | Modules |
==== Ethernet ==== | ==== Ethernet ==== | ||
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=== I²C master === | === I²C master === | ||
- | In this case, the entire device acts as [[cs: | + | In this case, the entire device acts as [[cs: |
=== Emulated COM port === | === Emulated COM port === | ||
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- | ===== Reading of measured values ===== | + | ===== Reading of the measured values ===== |
This design offers a possibility of connecting variety of sensors, which are initialised at every station startup. It uses [[cs: | This design offers a possibility of connecting variety of sensors, which are initialised at every station startup. It uses [[cs: | ||
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===== Auto diagnostics ===== | ===== Auto diagnostics ===== | ||
- | Necessary | + | Still necessary |
- | * Wind direction can not change without speed indication | + | * Wind direction can not change without speed indication |
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===== Output data format ===== | ===== Output data format ===== | ||
- | Ideal output data should be compatible with of the already used meteorological data protocols: | + | Ideal output data should be compatible with one of the already used meteorological data protocols: |
* NMEA | * NMEA | ||
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==== Data recording ==== | ==== Data recording ==== | ||
- | Data measured by weather station should be recorded and displayed locally. That is why a program serving the weather station should run either on local computer or directly on weather station processor. In the latter case, the weather station would probably run a web server as well, which could provide local data previews and send them to collection | + | Data measured by weather station should be recorded and displayed locally. That is why a program serving the weather station should run either on local computer or directly on weather station processor. In the latter case, the weather station would probably run a web server as well, which could provide local data previews and send them to collecting |
The following list contains some of the most widespread Open-Source programs for local data recording and processing. | The following list contains some of the most widespread Open-Source programs for local data recording and processing. | ||
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[[http:// | [[http:// | ||
- | Our ideal program should be multi-platform with minimal operating requirements and with possibility of sending data to one of the global network of weather stations. The data should be, at the same time, locally backed up and they should be able to combine with data from other stations. Examples of such databases | + | Our ideal program should be multi-platform with minimal operating requirements and with possibility of sending data to one of the global network of weather stations. The data should be, at the same time, locally backed up and they should be able to combine with data from other stations. Examples of such database |
===== Examples of use ===== | ===== Examples of use ===== | ||
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* **ver** denotes the device and firmware version | * **ver** denotes the device and firmware version | ||
* **seq** is the serial number of a measurement | * **seq** is the serial number of a measurement | ||
- | * **temp[K]** denotes the temperature | + | * **temp[K]** denotes the temperature |
* **hum_temp[K]** - temperature from 1st humidity sensor | * **hum_temp[K]** - temperature from 1st humidity sensor | ||
* **hum[%]** - relative humidity measured by 1st humidity sensor | * **hum[%]** - relative humidity measured by 1st humidity sensor | ||
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This condition occurs after resetting the device. | This condition occurs after resetting the device. | ||
- | Following that, a new firmware can be send using a command listed below (either under root account or under account with absolute | + | Following that, a new firmware can be send using a command listed below (either under root account or under account with access to the serial line) |
$ echo uf > / | $ echo uf > / | ||
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* [[http:// | * [[http:// | ||
+ | * [[http:// | ||
* [[http:// | * [[http:// | ||
* [[http:// | * [[http:// |
en/aws.txt · Last modified: 2015/03/05 22:49 (external edit)