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#include <WiFi.h>
#include "time.h"

#include "esp_sntp.h"

const char* ssid = "username";
const char* password = "password";
unsigned long reconnect_count = 0;

const char* ntpServer = "pool.ntp.org";
const long  gmtOffset_sec = 0;
const int   daylightOffset_sec = 0;

unsigned long epochTime; 


// Please tune the following value if the clock gains or loses.
// Theoretically, standard of this value is 60000.
#define MILLIS_PER_MIN 60000 // milliseconds per a minute

// Motor and clock parameters
// 4096 * 90 / 12 = 30720
#define STEPS_PER_ROTATION 30720 // steps for a full turn of minute rotor

// wait for a single step of stepper
int delaytime = 2;

// ports used to control the stepper motor
// if your motor rotate to the opposite direction, 
// change the order as {2, 3, 4, 5};
//int port[4] = {5, 4, 3, 2};

//int port[4] = {19, 18, 5, 17};
int port[4] = {17, 5, 18, 19};

// sequence of stepper motor control
int seq[8][4] = {
  {  LOW, HIGH, HIGH,  LOW},
  {  LOW,  LOW, HIGH,  LOW},
  {  LOW,  LOW, HIGH, HIGH},
  {  LOW,  LOW,  LOW, HIGH},
  { HIGH,  LOW,  LOW, HIGH},
  { HIGH,  LOW,  LOW,  LOW},
  { HIGH, HIGH,  LOW,  LOW},
  {  LOW, HIGH,  LOW,  LOW}
};

void rotate(int step) {
  static int phase = 0;
  int i, j;
  int delta = (step > 0) ? 1 : 7;
  int dt = 20;

  step = (step > 0) ? step : -step;
  for(j = 0; j < step; j++) {
    phase = (phase + delta) % 8;
    for(i = 0; i < 4; i++) {
      digitalWrite(port[i], seq[phase][i]);
    }
    delay(dt);
    if(dt > delaytime) dt--;
  }
  // power cut
  for(i = 0; i < 4; i++) {
    digitalWrite(port[i], LOW);
  }
}

void Wifi_connected (WiFiEvent_t event, WiFiEventInfo_t info) {
	Serial.println("ESP32 WIFI Connected to Access Point");
}

void Get_IPAddress(WiFiEvent_t event, WiFiEventInfo_t info) {
	Serial.println("WIFI Connected!");
	Serial.println("IP address of Connected WIFI: ");
	Serial.println(WiFi.localIP());
}

void Wifi_disconnected (WiFiEvent_t event, WiFiEventInfo_t info) {
	Serial.println("Disconnected from WIFI");
	Serial.print("Connection Lost Reason:");
	Serial.println(info.disconnected.reason);
	Serial.println("Reconnecting...");
  reconnect_count ++;

  if (reconnect_count % 50 == 0) {
    ESP.restart();
  }
  
	WiFi.begin(ssid, password);
  WiFi.setSleep(true);
  setCpuFrequencyMhz(240);

}

void printLocalTime()
{
  struct tm timeinfo;
  if(!getLocalTime(&timeinfo)){
    Serial.println("Failed to obtain time");
    return;
  }
  Serial.println(&timeinfo, "%A, %B %d %Y %H:%M:%S");
}

void setup() {
  Serial.begin(115200);

	WiFi.disconnect(true);
	delay(1000);
	WiFi.onEvent(Wifi_connected, SYSTEM_EVENT_STA_CONNECTED);
	WiFi.onEvent(Get_IPAddress, SYSTEM_EVENT_STA_GOT_IP) ;
	WiFi.onEvent(Wifi_disconnected, SYSTEM_EVENT_STA_DISCONNECTED);
	WiFi.begin(ssid, password);
	Serial.println("Waiting for WIFI network...");

  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
  printLocalTime();

  pinMode(port[0], OUTPUT);
  pinMode(port[1], OUTPUT);
  pinMode(port[2], OUTPUT);
  pinMode(port[3], OUTPUT);
  rotate(-20); // for approach run
  rotate(20); // approach run without heavy load
  rotate(STEPS_PER_ROTATION / 60);
}

// Function that gets current epoch time
unsigned long getTime() {
  time_t now;
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    //Serial.println("Failed to obtain time");
    return(0);
  }
  time(&now);
  return now;
}

boolean init_loop = false;
long epochMinutes = 0;

void loop() {


  // https://randomnerdtutorials.com/epoch-unix-time-esp32-arduino/

  while (!init_loop) {
    epochMinutes = getTime() / 60;
    if (epochMinutes > 0) { 
      Serial.print("Epoch Time: ");
      Serial.println(epochTime);
      init_loop = true;
    }
    delay(1000);
  }

  //static long prev_min = 0, prev_pos = 0;
  static long prev_min = epochMinutes, prev_pos = (STEPS_PER_ROTATION * prev_min) / 60;;
  long min;
  static long pos;

  //min = millis() / MILLIS_PER_MIN;
  min = getTime() / 60;

  //Serial.print("Min: ");
  //Serial.println(min);

  if(prev_min == min) {
    return;
  }
 
  prev_min = min;
  pos = (STEPS_PER_ROTATION * min) / 60;
  rotate(-20); // for approach run
  rotate(20); // approach run without heavy load
  if(pos - prev_pos > 0) {
    rotate(pos - prev_pos);
  }
  prev_pos = pos;

}