#include <SPI.h>
#include <LoRa.h>

const int pHSensorPin = A0; // Analog pin connected to the pH sensor
const int turbiditySensorPin = A2;
// const int turbiditySensorPin = A1; // Analog pin connected to the turbidity sensor
const int trigPin = 2; // Ultrasonic sensor's trig pin connected to digital pin 2
const int echoPin = 3; // Ultrasonic sensor's echo pin connected to digital pin 3

// LoRa module pins
const int csPin = 10;
const int resetPin = 9;
const int irqPin = 2;

void setup() {
  Serial.begin(9600); // Initialize serial communication

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // Initialize LoRa module
  LoRa.setPins(csPin, resetPin, irqPin);

  if (!LoRa.begin(915E6)) { // Initialize LoRa at 915 MHz
    Serial.println("Starting LoRa failed!");
    while (1);
  }
}

void loop() {
  int sensorValue_pH = analogRead(pHSensorPin); // Read pH sensor analog value
  float voltage_pH = sensorValue_pH * (5.0 / 1023.0); // Convert analog value to voltage for pH

  int sensorValue_turbidity = analogRead(turbiditySensorPin); // Read turbidity sensor analog value

  // Ultrasonic sensor to determine water level
  long duration, distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration / 2) / 29.1;

  // Check turbidity value, pH value, and water level to determine water condition
  String waterCondition;
  String pHCondition;
  String waterLevel;

  if (sensorValue_turbidity > 500 || voltage_pH < 1.8 || voltage_pH > 3.0) {
    waterCondition = "Not clean";

    if (voltage_pH < 1.8) {
      pHCondition = "Water pH is acidic";
    } else if (voltage_pH > 3.0) {
      pHCondition = "Water pH is alkaline";
    } else {
      pHCondition = "Water pH is neutral";
    }
  } else {
    waterCondition = "Clean";
    pHCondition = "Water pH is neutral";
  }

  if (distance >= 30) {
    waterLevel = "Full";
  } else if (distance < 30 && distance > 10) {
    waterLevel = "Normal";
  } else {
    waterLevel = "Too low";
  }

  // Prepare data to send via LoRa
  String data = "pH Voltage: " + String(voltage_pH) + " V, " +
                "Turbidity: " + String(sensorValue_turbidity) + ", " +
                "Water Level: " + waterLevel + ", " +
                "Condition: " + waterCondition + ", " +
                pHCondition;

  // Send data via LoRa
  LoRa.beginPacket();
  LoRa.print(data);
  LoRa.endPacket();

  // Print data to serial monitor
  Serial.println(data);

  delay(5000); // Delay for readability, adjust as needed
}