An experiment of a handy logger with communication function

Amane Endo

The University of Tokyo Faculty of Agriculture

  

Various data are observed in Mt. Fuji Research Station. It is not easy to visit there in summer, and it is impossible to visit in the winter season. When performing over-winter observation, the data are often taken with a data logger without telemetry technology.
In such an environment, we can’t get data for a year. If there are problem related to sensors and data loggers without telemetry technology, entire data will be lost.
Under such circumstances, if there are simple loggers that can be connected to various sensors, the way of research will be broadly expanded.

Therefore we are testing the possibility of “HALKA”  data logger, developed by our laboratory for Over-winter observation. (photo1)

"HALKA" data logger that can be used for various observations and telemetry system. It is maximum operate for one year with 3 AA batteries and sends data. In addition, we can change the configuration of monitoring remotely. The data are sent to the cloud and can be accessed from the web site at any time. The sending interval can be set from 1 hour to 24 hours from the web site.

HALKA can work with SDI-12 sensors, so it can be used for various sensors.

As in the photograph, we are currently observing the air temperature, relative humidity and atmospheric pressure in the Mt.Fuji Research Station with two sensors and two HALKA units. Observed data can be accessed from the following sites.

http://fewls.x-ability.jp/static/chart.html?imei=860585002581923&sensor=VP-4&after=2017-07-24

 

 

 

 

 

 

 

 

 

 

 

Photo 1.

“HALKA”  data logger

Photo 2. we are currently observing the air temperature, relative humidity and atmospheric pressure in the Mt.Fuji Research Station with two sensors and two HALKA units
Photo 2. we are currently observing the air temperature, relative humidity and atmospheric pressure in the Mt.Fuji Research Station with two sensors and two HALKA units

Data observed by HALKA that connected with VP-4 sensor
(In the upper chart the blue color is air temperature(℃), the red color is relative humidity, the pink color is atmospheric pressure. In the lower graph, the blue dots are the battery level and the red dots are the Photovolatics(PV) voltage (which is meaningless data because there is no PV attached))

“HALKA” is connected to METER's VP-4 sensor to measure air temperature, humidity and atmospheric pressure in the second floor of the 1st Office in Mt.Fuji Research Station.

http://fewls.x-ability.jp/static/chart2.html?imei=860585003206389&after=2017-08-10&sensor=ATM41

    

Fig 1. Data observed by HALKA that connected with VP-4 sensor
Fig 1. Data observed by HALKA that connected with VP-4 sensor

Data observed by HALKA that connected with ATOMS 41 sensor and PV (In the upper chart, the blue color is air temperature, the red color is humidity, the yellow color is atmospheric pressure, in the lower graph, the blue line is the battery level and the red line is the voltage of solar power generation)

The battery is recharged by 0.3 W solar panel with dimension of 7 cm x 4 cm. Weather parameters are measured by ATMOS 41 weather station made by METER Company. This weather station measure the thunder, air temperature, humidity, barometric pressure in the second floor of the 1st Office. For this data, it can be accessed from the following site:

http://fewls.x-ability.jp/static/chart2.html?imei=860585003206389&after=2017-08-10&sensor=ATM41


However, lightning sensor is not shown in the chart. 

Fig 2. Data observed by HALKA that connected with ATOMS 41 sensor and PV
Fig 2. Data observed by HALKA that connected with ATOMS 41 sensor and PV