esp8266 - lcd 16x2 and ntp

연결 방법

 

ESP8266의  I2C는 다음과 같이 변경 가능함.

수정 전 :Wire.begin() - SDA(D2), SCL(D1))

 

 

 

 

 

 

 

 

 

 

 

Code

//==NodeMCU==START
#define D0 (16)
#define D1 (5) //SCL //LiquidCrystal_I2C.cpp //Wire.begin();
#define D2 (4) //SDA //LiquidCrystal_I2C.cpp //Wire.begin();
#define D3 (0) //SDA(D3) //LiquidCrystal_I2C.cpp//Wire.begin(0,2);
#define D4 (2) //SCL(D4) ////LiquidCrystal_I2C.cpp//Wire.begin(0,2);
#define D5 (14)
#define D6 (12)
#define D7 (13)
#define D8 (15)
 
#define SD0 (7)
#define SD1 (8)
#define SD2 (9)
#define SD3 (10)
//==NodeMCU==END
 
//==WIFI==START
#include <ESP8266WiFi.h>
const char* ssid = "xxxx-xxx";
const char* password = "xxxxxxxxxx";
//==WIFI==END
 
//==LCD_16by2==START
#include <LiquidCrystal_I2C.h>
 
LiquidCrystal_I2C lcd(0x3F,16,2);
//==LCD_16by2==END
 
 
//==LED BLINK==START
#define BUILTIN_LED     D4
volatile bool statusLed = false;
//==LED BLINK==END
 
 
//==NTP==START
#include <time.h>
#include <sys/time.h>
#include <coredecls.h>
 
#define TZ              8
#define DST_MN          60
#define TZ_SEC          ((TZ)*3600)
#define DST_SEC         ((DST_MN)*60)
 
timeval cbtime;
bool cbtime_set = false;
 
timeval tv;
timespec tp;
time_t now;
 
void time_is_set (void)
{
  gettimeofday(&cbtime, NULL);
  cbtime_set = true;  
}
 
int now_ss;
void loop_NTP()
{
  gettimeofday(&tv, nullptr); 
 
  static time_t lastv = 0;
  if (lastv != tv.tv_sec) {    
    lastv = tv.tv_sec;   
    now_ss = (lastv % 60);  
 
    static bool started = false;
    if (!started)
    {
      started = true;
      pinMode(BUILTIN_LED, OUTPUT);
    }
 
    digitalWrite(BUILTIN_LED, statusLed);
    statusLed = !statusLed;
  }
}
//==NTP==END
 
 
//==Time Sync CHECK==START
unsigned int g_hour = 0;
unsigned int g_minute = 0;
unsigned int g_second = 0;
unsigned int g_mday = 0;
unsigned int g_mon = 0;
unsigned int g_year = 0;
 
int old_ss;
void time_sync_check_func(void)
{
  if(old_ss != now_ss)
  {
    time_t rawtime;
    struct tm* local_timeinfo;    
    
    time(&rawtime);
    local_timeinfo = localtime(&rawtime);
    
    if((local_timeinfo->tm_year+1900) >= 2022)
    {
      g_hour = local_timeinfo->tm_hour;
      g_minute = local_timeinfo->tm_min;
      g_second = local_timeinfo->tm_sec;
      g_mday = local_timeinfo->tm_mday;
      g_mon = local_timeinfo->tm_mon+1;
      g_year = local_timeinfo->tm_year+1900;
    }
    else
    {
      Serial.println("Error Time Sync=========!!");    
    }
    
    time_show();
    
    old_ss = now_ss;
  }
}
//==Time Sync CHECK==END
 
 
//==LCD_16by2==START
void start_text(void) {
  Serial.println("\nlcd.init..");
  lcd.init();
  lcd.clear();
  lcd.backlight();
    
  lcd.setCursor(0,0);
  lcd.print("LCD TEST!");
  
  lcd.setCursor(0,1);
  lcd.print("0xABCDEF");
}
 
void lcd_text(int x, int y, String text,bool reset_flag) {
  if(reset_flag)
  { 
    lcd.clear();
    lcd.setCursor(x,y);
    lcd.print(text);
  }
  else
  {
    lcd.setCursor(x,y);
    lcd.print(text);
  }
}
 
void time_show(void)
{
  static bool colon_view = true;
  
  String g_year_str = String(g_year);
  String g_mon_str = String(g_mon);
  String g_mday_str = String(g_mday);
  if(g_mon < 10)
    g_mon_str = " " + String(g_mon);
  if(g_mday < 10)
    g_mday_str = " " + String(g_mday);    
  String text_str_day = g_year_str + "/" + g_mon_str + "/" + g_mday_str;  
  
  
  String text_str_time;
  String g_hour_str = String(g_hour);
  if(g_hour < 10)
    g_hour_str = " " + String(g_hour);
  String g_minute_str = String(g_minute);
  if(g_minute < 10)
    g_minute_str = "0" + String(g_minute);
  String g_second_str = String(g_second);
  if(g_second < 10)
    g_second_str = "0" + String(g_second);
    
  if(colon_view)
  {
    text_str_time = g_hour_str + ":" + g_minute_str + ":" + g_second_str;
    colon_view = false;
  }
  else
  {
    text_str_time = g_hour_str + " " + g_minute_str+ " " + g_second_str;
    colon_view = true;
  }  
  lcd_text(0, 0, text_str_day, true);
  lcd_text(0, 1, text_str_time, false);
}
//==LCD_16by2==END
 
 
void setup(void) {
  
  Serial.begin(115200);
  Serial.println();
  delay(3000);
 
//==LCD_16by2==START
  lcd.begin(16,2);
  start_text();
  delay(2000);  
//==LCD_16by2==END
 
  
//==WIFI==START
  Serial.println("WIFI !");
  WiFi.mode(WIFI_STA);
  
  WiFi.begin(ssid, password);
  Serial.print("\nConnecting to "); Serial.println(ssid);
  uint8_t i = 0;
  while (WiFi.status() != WL_CONNECTED && i++ < 600) delay(500);
  if(i == 601){
    Serial.print("Could not connect to"); Serial.println(ssid);
    while(1) delay(500);
  }
  else
  {
    Serial.print("\nConnected: "); Serial.println(ssid);
  }  
//==WIFI==END
 
 
//==NTP==START
  settimeofday_cb(time_is_set);
  configTime(TZ_SEC, DST_SEC, "pool.ntp.org");
//==NTP==END
 
} //setup()
 
 
void loop(void) {
 
//==Time Sync CHECK==START
  time_sync_check_func();
//==Time Sync CHECK==END  
 
//==NTP==START
  loop_NTP();  
//==NTP==END
 
} //loop()

 

Result

lcd.init.. WIFI ! Connecting to xxxx-xxx Connected: xxxx-xxx Error Time Sync=========!!