Marine and Atmospheric Parameter Monitoring System
Simultaneous monitoring of water quality and atmospheric conditions in coastal and port areas meets a critical data need from both environmental compliance and operational safety perspectives. The core engineering challenge in such systems is not the measurement itself but the deployment conditions: an open-sea environment without mains connection, continuously humid and salty atmosphere, and an energy budget dependent on sunlight. HEFA Teknoloji A.Ş. developed an autonomous monitoring system as contractor under an EU-funded project, simultaneously measuring marine and atmospheric parameters, solar-powered and transmitting data remotely via GSM.
What We Built
Sensor Infrastructure
- Marine Parameters: pH (Electrochemical), ORP/Oxidation-Reduction Potential (Electrochemical), EC/Electrical Conductivity (Electrochemical), Temperature (PT1000), Dissolved Oxygen — DO (Electrochemical), Dissolved CO₂ — DCO₂ (NDIR)
- Atmospheric Parameters: Temperature and Humidity (Capacitive), CO₂ (NDIR), Wind Speed (Anemometer), Wind Direction (Ultrasonic)
Power Management — Solar Panel and Battery
- Solar panel (primary energy source), Battery (backup power for night and overcast conditions), Power management circuit (MPPT-supported charge regulator)
- Energy budget, sensor sampling frequency and GSM transmission periods are jointly optimised.
Communication Infrastructure
- Periodic data transmission over GSM network. Data from each measurement cycle is structured in JSON format and transmitted via HTTP POST to a REST API endpoint.
- Webhook-based notification on threshold breach or system fault.
Embedded Firmware and Data Analysis
- Sensor reading and calibration: temperature compensation applied for pH, ORP and EC parameters.
- Threshold alarms: independent upper/lower alarm thresholds per parameter; false alarm suppression using average value over a time window; webhook notification via GSM on threshold breach.
- Power management firmware: dynamic management of sampling frequency, GSM transmission period and sleep modes based on battery charge state.
- Dissolved Oxygen time series analysis: Trend component (long-term DO change), seasonal component (daily photosynthesis/respiration cycle) and residual component (sudden events, pollution spills) separated using seasonal decomposition.
Technical Specifications
| Parameter | Value |
|---|---|
| Marine measurements | pH, ORP, EC, Temperature, DO, DCO₂ |
| Atmospheric measurements | Temperature, Humidity, CO₂, Wind speed, Wind direction |
| Power source | Solar panel + battery backup |
| Communication | GSM — JSON / REST API |
| Notification | Webhook-based alarm |
| Data analysis | Time series seasonal decomposition (DO) |
| Project support | EU-funded |
Use Cases
- Port and Coastal Monitoring — Water quality changes from vessel traffic in port areas, fuel spill risk and atmospheric emission monitoring. Recording wind speed and direction together with water quality parameters creates a valuable data set for pollution source detection and dispersion modelling.
Frequently Asked Questions
What measures were taken against saltwater and humidity conditions on the circuit?
Can the solar panel power the system in cloudy or winter conditions?
Why is seasonal decomposition necessary for DO?
This project covers multi-parameter water quality and meteorology sensor integration, solar-powered power system design, marine-environment-suitable hardware design, GSM-based remote data transmission and statistical time series analysis. If you need end-to-end sensor-based monitoring system development, we can evaluate your technical requirements together. end-to-end sensor product development service for more information.
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