Components

	ATMEGA3290-16AU Microchip Technology / Atmel	x 1
	MS580305BA01-00	x 1
	AD8495ARMZ Analog	x 1
	LM2574HVN-5 ti	x 1

Tools, APP Software Used etc.

	kicad kicad
	Arduino Lab for MicroPython Arduino

Description

sea monitoring for fishe farming

the project is about helping the fishe farmer who rise the fishes inthe ocean or seas to monitor the state of the water like temperature ph , oxigen , that can even dive by letting the water go in the ball to monitor the under waterstate also and is use solar cell and bettery to stay in working and using gsm to message the state to keep real monitorin time function and this is the advantage of it

Code

i didnt finish the code yet

Arduino

#include <Wire.h>
#include <MS5803_05.h> 
#include <SoftwareSerial.h>


#define INLET_VALVE_RELAY 5
#define OUTLET_PUMP_RELAY  6
#define PH_PIN      A0
#define O2_PIN      A1
#define TEMP_PIN    A2
#define GSM_TX      7
#define GSM_RX      8

#define MAX_DEPTH   4.0 

SoftwareSerial gsm(GSM_TX, GSM_RX);
MS5803 sensor(ADDRESS_HIGH); 


float lastTemp, lastPH, lastO2, lastDepth; 

enum State {SURFACE, DESCENDING, SAMPLING, ASCENDING, DONE};
State deviceState = SURFACE;

void setup() {
  Serial.begin(9600);
  gsm.begin(9600);
  
  pinMode(INLET_VALVE_RELAY, OUTPUT);
  pinMode(OUTLET_PUMP_RELAY, OUTPUT);
  
  
  digitalWrite(INLET_VALVE_RELAY, LOW);
  digitalWrite(OUTLET_PUMP_RELAY, LOW);
  
  sensor.reset();
  sensor.begin();
  
  // Init GSM
  delay(1000);
  gsm.println("AT+CMGF=1"); 
  delay(100);
  gsm.println("AT+CNMI=1,2,0,0,0"); 
  
  Serial.println("System Initialized. Awaiting Monitoring");
  deviceState = DESCENDING; 
}

void loop() {
  float currentDepth = getDepth();
  checkSMS(); 

  switch (deviceState) {
    case DESCENDING:
      digitalWrite(INLET_VALVE_RELAY, HIGH); 
      if (currentDepth >= MAX_DEPTH) {
        digitalWrite(INLET_VALVE_RELAY, LOW);
        deviceState = SAMPLING;
      }
      break;

    case SAMPLING:
      readData(); 
      delay(5000); 
      deviceState = ASCENDING;
      break;

    case ASCENDING:
      digitalWrite(OUTLET_PUMP_RELAY, HIGH); 
      if (currentDepth <= 0.2) { 
        digitalWrite(OUTLET_PUMP_RELAY, LOW); 
        deviceState = DONE;
      }
      break;
      
    case DONE:
      
      digitalWrite(INLET_VALVE_RELAY, LOW);
      digitalWrite(OUTLET_PUMP_RELAY, LOW);
      break;
  }
  delay(500);
}

void readData() {
  
  float vPH  = analogRead(PH_PIN) * (5.0 / 1023.0);
  float vO2  = analogRead(O2_PIN) * (5.0 / 1023.0);
  float vTmp = analogRead(TEMP_PIN) * (5.0 / 1023.0);

  
  lastPH = 7.0 + ((2.5 - vPH) / 0.185);

  
  lastO2 = vO2 * 4.0; 

  
  lastTemp = vTmp * 200.0; 

  Serial.print("--- NEW DATA ---");
  Serial.print(" Temp: "); Serial.print(lastTemp);
  Serial.print("C | pH: "); Serial.print(lastPH);
  Serial.print(" | O2: "); Serial.print(lastO2);
  Serial.println("mg/L");
}

void checkSMS() {
  if (gsm.available() > 0) {
    String message = gsm.readString();
    if (message.indexOf("STATUS") > -1) {
      sendReply();
    }
  }
}

void sendReply() {
  gsm.println("phone=\"+213540680689\"");
  delay(100);
  gsm.print("Marine Log: Depth:"); gsm.print(lastDepth);
  gsm.print("m, Temp:"); gsm.print(lastTemp);
  gsm.print("C, pH:"); gsm.print(lastPH);
  gsm.print(", O2:"); gsm.print(lastO2);
  gsm.write(26); 
  delay(1000);
}

float getDepth() {
  float pressure_abs = sensor.getPressure(ADC_4096); 
  float depth = (pressure_abs - 1013.25) / 100.0; 
  lastDepth = (depth < 0) ? 0 : depth;
  return lastDepth;
}

Schematic and Layout

sea_monitor1.kicad_sch

sea_monitor1.kicad_pcb

Jan 24,2026

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