#include <SD.h>

const int analogPin = A0;              // Analog pin for potentiometer
const int digitalPin = 2;              // Digital pin for button
const int ledPinPot = 3;               // Digital pin for potentiometer LED
const int ledPinTMP36 = 4;             // Digital pin for TMP36 LED
const int ledPinSoilMoisture = 5;      // Digital pin for soil moisture LED
const int ledPinPhotoresistor = 6;     // Digital pin for photoresistor LED
const int ledPinTilt = 8;              // Digital pin for tilt sensor LED
const int analogPinTMP36 = A1;         // Analog pin for TMP36 temperature sensor
const int soilMoisturePin = A2;        // Analog pin for soil moisture sensor
const int analogPinPhotoresistor = A3; // Analog pin for photoresistor
const int tiltSensorPin = 7;           // Digital pin for tilt sensor

int analogValue;
int digitalValue;
int analogValueTMP36;
int soilMoistureValue;
int photoresistorValue;
int tiltSensorValue;

String outString;  // Declare a global string variable to store data

void setup() {
  pinMode(analogPin, INPUT);
  pinMode(digitalPin, INPUT);
  pinMode(analogPinTMP36, INPUT);
  pinMode(soilMoisturePin, INPUT);
  pinMode(analogPinPhotoresistor, INPUT);
  pinMode(tiltSensorPin, INPUT);
  pinMode(ledPinPot, OUTPUT);
  pinMode(ledPinTMP36, OUTPUT);
  pinMode(ledPinSoilMoisture, OUTPUT);
  pinMode(ledPinPhotoresistor, OUTPUT);
  pinMode(ledPinTilt, OUTPUT);
  Serial.begin(9600);

  // Initialize SD card
  if (!SD.begin(10)) {
    Serial.println("SD Card initialization failed!");
    return;
  }

  // Create or open the CSV file
  File dataFile = SD.open("data.csv", FILE_WRITE);
  if (dataFile) {
    dataFile.println("Analog,LED_Analog,Temperature,LED_TMP36,Soil_Moisture,LED_SoilMoisture,Photoresistor,LED_Photoresistor,Tilt_Sensor,LED_Tilt");
    dataFile.close();
  } else {
    Serial.println("Error opening data.csv");
  }
}

void loop() {
  analogValue = analogRead(analogPin);
  analogValueTMP36 = analogRead(analogPinTMP36);
  digitalValue = digitalRead(digitalPin);
  soilMoistureValue = analogRead(soilMoisturePin);
  photoresistorValue = analogRead(analogPinPhotoresistor);
  tiltSensorValue = digitalRead(tiltSensorPin);

  int brightness = map(analogValue, 0, 1023, 0, 255);
  analogWrite(ledPinPot, brightness);

  float temperature = analogValueTMP36 * 0.48876;

    // LED indication for TMP36
  if (temperature > 80) {
    digitalWrite(ledPinTMP36, HIGH);
  } else {
    digitalWrite(ledPinTMP36, LOW);
  }

  // LED indication for Soil Moisture
  if (soilMoistureValue < 400) {
    digitalWrite(ledPinSoilMoisture, HIGH);
  } else {
    digitalWrite(ledPinSoilMoisture, LOW);
  }

  // LED control based on Photoresistor
  int photoresistorThreshold = 500;
  if (photoresistorValue > photoresistorThreshold) {
    digitalWrite(ledPinPhotoresistor, HIGH);
  } else {
    digitalWrite(ledPinPhotoresistor, LOW);
  }

  // LED control based on Tilt Sensor
  if (tiltSensorValue == HIGH) {
    digitalWrite(ledPinTilt, HIGH);
  } else {
    digitalWrite(ledPinTilt, LOW);
  }

  // Construct the CSV string
  outString = String(analogValue) + "," +
              (digitalRead(ledPinPot) == HIGH ? "ON" : "OFF") + "," +
              String(temperature) + "," +
              (digitalRead(ledPinTMP36) == HIGH ? "ON" : "OFF") + "," +
              String(soilMoistureValue) + "," +
              (digitalRead(ledPinSoilMoisture) == HIGH ? "ON" : "OFF") + "," +
              String(photoresistorValue) + "," +
              (digitalRead(ledPinPhotoresistor) == HIGH ? "ON" : "OFF") + "," +
              String(tiltSensorValue) + "," +
              (digitalRead(ledPinTilt) == HIGH ? "ON" : "OFF");

  // Print the data to the Serial monitor
  Serial.println(outString);

  // Write the data to a CSV file
  writeToCSV(outString);

  delay(1000);
}

void writeToCSV(String data) {
  // Open the file in append mode
  File dataFile = SD.open("data.csv", FILE_WRITE);

  // If the file is available, write to it
  if (dataFile) {
    dataFile.println(data);
    dataFile.close();
  } else {
    Serial.println("Error writing to data.csv");
  }
}