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	- Project: **Sensor Server**
	- Source Code NOT compiled for: ESP32 DevKit V1
	- Source Code created on: 2024-10-22 09:37:41

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* merge code. */
/****** END SYSTEM REQUIREMENTS *****/

/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <TinyGPSPlus.h>
//#include <SoftwareSerial.h> // SoftwareSerial is not compatible with ESP32, use hardware serial instead
#include "ACS712.h"
#include <WiFi.h>
#include <ESPAsyncWebServer.h>
#include <SPIFFS.h>
#include <ArduinoJson.h>
#include <EEPROM.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include "X9C10X.h"

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

// Access Point credentials
char ssid[] = "pleasedontcode.com"; // your network SSID (name)
char pass[] = "prova1234"; // your network password (use for WPA, or use as key for WEP)

// Create an instance of the web server
AsyncWebServer server(80);

TinyGPSPlus gps;

// Pin configuration
#define VELOCITA_SOGLIA_HIGH 75.0 // km/h
#define VELOCITA_SOGLIA_LOW 65.0 // km/h
#define VELOCITA_SOGLIA_0A_HIGH 20.0 // km/h
#define VELOCITA_SOGLIA_0A_LOW 10.0 // km/h

// PINS
const int water_level_pin = 18;
const int voltage_pin = 35;
const int current_pin = 34;
const int tempSensor1_pin = 33;
const int tempSensor2_pin = 32;
const int ONE_WIRE_BUS_Temp1 = 19; // sonda temp 1
const int ONE_WIRE_BUS_Temp2 = 21; // sonda temp 2
const int DIGPOT_INC = 4; // pin INC - X9C103S
const int DIGPOT_UD = 5; // pin UD - X9C103S
const int DIGPOT_CS = 15; // pin CS - X9C103S

const float PWM_output_percentage_0A = 0.0; // 0%
const float PWM_output_percentage_9A = 20.0; // 20%
const float PWM_output_percentage_5A = 13.0; // 13%

// Global variables for sensor data
float PWM_output_percentage = 0.0;
float velocita = 0.0;
float voltage_output_value = 0.0;
bool waterLevelEmpty = true;
float voltage = 0.0;
float current = 0.0;
float temperature1 = 0.0;
float temperature2 = 0.0;
unsigned long powerOnTime = 0; // minutes

boolean startRegeneration = false;
unsigned int set_current = 0;
unsigned int set_timer = 0;

// ACS712 configuration
unsigned int ADC_Offset = 1930;
ACS712 ACS(current_pin, 3.3, 4095, 40); // pin 34 for current sensor acquisition

X9C10X pot(10000); // 10KΩ - digital potentiometer X9C103S

// Function prototypes for setup logic
void printWiFiStatus();
void printWebPage();
void checkClientRequest(String currentLine);

// HTTP server response states
bool ReplyWebPageContent = true;
bool ReplyResetTime = false;
bool postUpdateData = false;

static const int GPSBaud = 9600;
#define ss Serial2 // Use Serial2 for GPS communication

unsigned long TEMPO_ATTESA_VISUALIZZAZIONE_VELOCITA = 300;
unsigned long SpeedShowTimer = 0;

// Timer counters
unsigned long secondsCounter            = 0;
unsigned long previousMillis            = millis(); // Variable to store the previous millis value
unsigned long currentMillis             = millis();
unsigned long minutesCounter            = 0;

// Setup OneWire instances for temperature sensors
OneWire oneWire1(ONE_WIRE_BUS_Temp1);
OneWire oneWire2(ONE_WIRE_BUS_Temp2);

// Setup Dallas Temperature Library 
DallasTemperature sensor1(&oneWire1);
DallasTemperature sensor2(&oneWire2);

// Characteristic curves for ADC inputs
const uint8_t SEGMENT_POINTS_voltage_Temperature = 10;
const float voltage_Temperature_lookup[2][SEGMENT_POINTS_voltage_Temperature] =
{
    {0.0, 1.2, 1.9, 5.0, 10.0, 14.5, 17.0, 20.0, 30.0, 35.0}, // voltage [V]
    {0.0, 5.0, 7.0, 13.0, 22.0, 29.0, 33.0, 37.0, 56.0, 65.0} // temperature [°C]
};

// Initialize SPIFFS for file storage
void initSPIFFS() {
  if (!SPIFFS.begin(true)) {
    Serial.println("An error occurred while mounting SPIFFS.");
    return;
  }
  Serial.println("SPIFFS mounted successfully.");
}

void setup() {
  Serial.begin(115200); // Start Serial for debugging

  delay(1000);
  Serial.println("ciao");

  pot.begin(DIGPOT_INC, DIGPOT_UD, DIGPOT_CS); // Initialize digital pot
  
  for (int i=0; i<10; i++)
  {
    setCurrentOutput(0);
    delay(20);
    setCurrentOutput(100);
    delay(20);
  }
  
  setCurrentOutput(PWM_output_percentage);
  readMinutesCounterFromEEPROM();
  
  ss.begin(GPSBaud);
  Serial.println("ciao2");

  sensor1.begin(); 
  sensor2.begin(); 

  smartDelay(1000);

  ACS.setMidPoint(ADC_Offset); 

  Serial.println(F("Access Point Web Server"));

  initSPIFFS(); // Initialize SPIFFS

  WiFi.mode(WIFI_AP); // Set ESP32 to access point mode
  if (!WiFi.softAP(ssid, pass)) {
    Serial.println("Soft AP creation failed.");
    while(1);
  }

  // Print the IP address of the access point
  IPAddress IP = WiFi.softAPIP();
  Serial.print("Access Point IP Address: ");
  Serial.println(IP);

  // Web server routes
  server.on("/background.jpg", HTTP_GET, [](AsyncWebServerRequest *request) {
    request->send(SPIFFS, "/background.jpg", "image/jpeg");
  });

  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request) {
    request->send(SPIFFS, "/index.html", "text/html");
  });

  server.on("/UPDATEDATA", HTTP_POST, [](AsyncWebServerRequest *request) {
    // Create JSON document
    StaticJsonDocument<512> doc;
    updateData(doc); // Fill JSON with updated data
    String response;
    serializeJsonPretty(doc, response); // Convert to string
    request->send(200, "application/json", response);
  });

  server.begin(); // Start the server
}

void loop() {
  readGPSAndCheckSpeed();
  readCurrent();
  readVoltage();
  readWaterTank();
  readTemp1();
  readTemp2();
  updateMinutesCounter();
  checkRegeneration();
}

// Function to send data as JSON response
void updateData(JsonDocument &doc) {
  if (velocita > 0.0) {
    doc["speed"] = String(velocita) + String(F(" km/h"));
  } else {
    doc["speed"] = String(F("ERROR"));
  }
  doc["voltageCommandOut"] = String(F("Tensione uscita comando: ")) + String(voltage_output_value) + String(F("/3.3 [V]"));
  doc["percentageCommandOut"] = String(F("Uscita comando PWM: ")) + String(PWM_output_percentage) + String(F(" [%]"));
  
  doc["waterTankLevel"] = waterLevelEmpty ? String(F("VUOTO")) : String(F("PIENO"));
  doc["powerOnTime"] = String(powerOnTime) + String(F(" min"));
  doc["current"] = String(current) + String(F(" A"));
  doc["voltage"] = String(voltage) + String(F(" V"));
  doc["temperature1"] = String(temperature1) + String(F(" °C"));
  doc["temperature2"] = String(temperature2) + String(F(" °C"));
  doc["set_timer"] = String(F("Timer : ")) + String(set_timer) + String(F(" min"));
}

void checkRegeneration() {
  if(set_timer == 0) {
    startRegeneration = false;
  }
}

// Reading functions continue..
void readMinutesCounterFromEEPROM() {
  unsigned long max_minutesCounter = 0UL - 1UL;
  EEPROM.begin(sizeof(powerOnTime));
  EEPROM.get(0, powerOnTime);

  if (powerOnTime == max_minutesCounter) {
    powerOnTime = 0;
  }

  Serial.print("powerOnTime: ");
  Serial.println(powerOnTime);
}

void updateMinutesCounter() {
  currentMillis = millis();
  if ((currentMillis - previousMillis) > 1000) {
    previousMillis = currentMillis;
    secondsCounter++;
    if (secondsCounter % 60 == 0) {
      secondsCounter = 0;
      minutesCounter++;
      powerOnTime++;
      if (minutesCounter % 10 == 0) { // Save counter every 10 minutes
        saveMinutesCounterInEEPROM();
      }
      if (set_timer > 0) {
        set_timer--;
      }
    }
  }
}

void saveMinutesCounterInEEPROM() {
  EEPROM.put(0, powerOnTime);
  EEPROM.commit();
}

void readGPSAndCheckSpeed() {
  while (ss.available() > 0) {
    if (gps.encode(ss.read())) {
      checkSpeed();
    }
  }
}

void checkSpeed() {
  // Insert timed sensor reading logic
}

/* END CODE */