Level 0 : Configurations

Tech Specs

Name : Goethe
Type : Outdoor
List Of Variable water_depth
Short Description: Outdoor Configuration, Professional, designed for continuous measurement of the water level in a medium-sized urban canal. Connection with the local power grid and data communication via the mobile network (GPRS signal strong and stable).

DESCRIPTION:

Project Requirements

Site of interest Environment: Urban, proximity to a river
latitudes: Medium
aggressiveness: normal
mechanical stress: normal
solar radiation: good (some obstacles in the area)
temperature range: -10 - 40°C
Connectivity: GPRS mobile network,strong and stable signal
Note -
Variables of interest Variable 1: hydrometrical level
operational range: max. 8 m.
instrumental precision -
resolution 1 cm.
required standard: IP67

Description

The outdoor configuration “GOETHE” is designed to meet the project requirements. The name comes from the site of the first intallation of this configuration (Via Goethe, Vicenza, Italy).

The following figure describes the general architecture scheme.

Measuring Chain

The measuring chain is featured at each site of installation by the coupling of a third party measuring instrument dedicated to the hydrometrical level and a remote station realized in compliance of the ACRONET Paradigm. The station hosts the Datalogger and rice-transmission of data functionalities.

The link to the ACRONETWORK infrastructure is direct, through the GPRS module mounted in the station. Immediately, ACRONETWORK forwards data to an FTP server.

Devices and physical connections

The model VEGAPULS WL61 manufactured by VEGA Grieshaber KG, marketed in Italy by NESA Srl, has been selected as measuring instrument. The sensor is based on the radar technology and includes a transducer for microwave K-band housed inside a body resin with IP68 protection. It is a measuring instrument that is perfectly suited to measure the level of water in the open field and is characterized by a narrow beam of microwave (which solves the problem of potential foams due to turbulence in the flow).

The station is the device ACROSTATION family "O" (outdoor) in its release 02a. In particular, the instrument has an internal antenna GPRS and dedicated power module (PCB Power ACROBoard VO1 and r04 battery).

The station also contains both the electronic board ACROboard "Station" v01 r09 and a daughter board dedicated to conditioning the signal from the measuring instrument.

The connection between the two devices is done through the shielded cable supplied with the sensor.

Signals, data and protocols

The station receives the signal of the sensor generating with the same continuity the timeseries of data in native format. The firmware of the configurataion allows the metadating, the integration in time, and an early check of the accuracy by filtering eventual anomalous values.

Finally, the GPRS module transmits data according with the configuration file, normally in compliance with a simple HTTP not encripted protocol.

Power

The ACROSTATION o02a is distinguished from the previous devices of the same family with regard to the power supply.

In particular, the device has the possibility of transposing the input power supplies of different origins (solar panel, power units consist of appropriately sized batteries, mains) through the same bayonet connector. This possibility is provided by the characteristics of the power module (Power ACROboard v01 r04 and back-up battery).

In the case of the GOETHE Configuration, with regards to the features of the site, the power supply is ensured by connecting to the local power grid.

The transformation takes place upstream of the configuration through a 24 volt power supply apparatus whose job is purely to keep charging the backup battery with high capacity (which in turn feeds with Uninterrupted Power Supply the sensor, and the data logger). Given the design requirements, a battery RS Lead Acid 12V 12Ah was used: it is able to maintain function in the measurement chain also for periods of interruption of the network of the order of 8 hours.

Implementation

To make the configuration operational, the corresponding firmware (available at the bottom of this page) has to be installed, by using the appropriate programmer, in the MIC which is mounted on the ACROboard Station (equipping the station itself).

Similarly, at the first run, the base configuration file (available at the bottom of this page) that makes available the dialog with the ACRONETWORK infrastructure has to be uploaded.

Mounting and installation

The assembly involves the use of an outreach stainless steel intended to accommodate the sensor on the one hand and the anchoring system on the other. Behind the outreach, the inspectable station was located. Everything was in place at the bridge provided by ACQUE VICENTINE.

Reliability

In order to minimize possible time "out of service" station is equipped with a plug-and-play system.

The cables for signal and electric supply are connected to the station via two "bayonet" connectors from outside that allow for easy replacement of the entire station, without even opening the box.

If necessary, it is possible to restore the functioning of the monitoring system, even before the cause of an occurring problem is diagnosed (lightning, theft, vandalism, et)

The solution is made possible by the relatively low cost of any component of the Open Hardware monitoring systems .

On the station, three status LEDs are visible from outside- Their lits in sequence, indicate:

  • LED red: the correct voltage from the power supply
  • LED orange: the proper functioning of the internal datalogger
  • green LED: the presence of the signal for GPRS data transmission

Download Box

This area includes both the firmware dedicated to this specific Configuration and the basic implementation. You can use the firmware to manage the electronic side of the apparatuses, while the basic implementation is fundamental to run the system (define parameters, position, etc.). You can easily download them or find them in the GitHub repository.

Firmware

The Firmware is the program (sequence of instructions) that has to be integrated directly into the microcontroller placed on the ACROBoard selected for the Configuration. Its main purpose is to start the MIC as well as to interact with the other electronic items. Here you can find the .7z, the .zip folders and the link to the GitHub repository.

Basic Implementation

This set of files is coupled with the firmware and is fundamental to set specific operational parameters (position, frequency of logging, etc.).Here you can find the .7z, the .zip folders and the link to the GitHub repository.