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Full Discussion: Arduino UNIX Time - Syncing Computer UNIX Time to Arduino Time with Python
Top Forums Programming Arduino UNIX Time - Syncing Computer UNIX Time to Arduino Time with Python Post 303042409 by Neo on Monday 23rd of December 2019 11:53:59 PM
Old 12-24-2019
Here is a quick sketch I put together for the Arduino UNO to get the unix time from the usb serial port and sync the Arduino time to the computer (in my case macos).

This sketch works but needs more refinement (trap errors, disconnects, add options, etc) but since I will not be doing much with this for the next few weeks, I post the first working draft below and will also post the python script I use on macos soon:

Code:
/*
  Sync UNIX Time with Computer and
  LCD Display with I2C on Arduino UN0
  Rough Draft 0.1  (needs improvements)
  Neo December 2019
  https://www.unix.com
*/

// Include Wire Library for I2C
#include <Wire.h>
// Include NewLiquidCrystal Library for I2C
#include <LiquidCrystal_I2C.h>
#include <Time.h>
#include <TimeLib.h>

#define TIME_MSG_LEN 11 // time sync to PC is HEADER followed by Unix time_t as ten ASCII digits
#define TIME_HEADER 'T' // Header tag for serial time sync message
#define TIME_REQUEST 7  // ASCII bell character requests a time sync message
#define DEBUG_SKETCH false
// Define LCD pinout
const int en = 2, rw = 1, rs = 0, d4 = 4, d5 = 5, d6 = 6, d7 = 7, bl = 3;
// can be any integer greater than zero and less than recent unix time
const int time_int = 1000;
// Define I2C Address - change if reqiuired
const int i2c_addr = 0x27;
String s;
bool flag = true;
time_t t = now();
LiquidCrystal_I2C lcd(i2c_addr, en, rw, rs, d4, d5, d6, d7, bl, POSITIVE);
void setup()
{
    Serial.begin(9600);
    Wire.begin();
    time_t t = now();
    lcd.begin(16, 2);
    lcd.clear();
}

void loop()
{
    lcd.clear();
    int count = 0;
    if (Serial.available() and flag)
    {
        lcd.clear();
        lcd.setCursor(0, 1);
        lcd.print("Serial OK");
        count = processSyncMessage();
        if (DEBUG_SKETCH)
        {
               Serial.println("Serial Available: " + count);
        }
        if (count > time_int)
            flag = false;
    }

    lcd.setCursor(0, 0);
    if (timeStatus() == timeNotSet)
    {
        if (flag)
        {
            Serial.println("waiting for sync message");
            lcd.print("Arduino Time:");
        }
    }
    else
    {

        lcd.print("Unix Time:");
        if (DEBUG_SKETCH)
        {
            Serial.println("Time Synced");
        }
    }
    t = now();
    s = String(t);
    if (s != '0')
    {
        lcd.setCursor(0, 1);
        lcd.print(t);
        lcd.print(" secs");
    }
    Serial.println(s);
    delay(1000);
    lcd.clear();
}

int processSyncMessage()
{
    while (Serial.available() >= TIME_MSG_LEN)
    { // time message consists of header & 10 ASCII digits
        char c = Serial.read();
        int count = 0;
        Serial.print(c);
        time_t pctime = 0;
        if (c == TIME_HEADER)
        {
            for (int i = 0; i < TIME_MSG_LEN - 1; i++)
            {
                c = Serial.read();
                if (c >= '0' && c <= '9')
                {
                    Serial.print(c);
                    count++;
                    pctime = (10 * pctime) + (c - '0'); // convert digits to a number
                }
            }
            Serial.print("\n");
            if (DEBUG_SKETCH)
            {
                Serial.write(pctime + "\n");
                Serial.println(pctime);
            }
            setTime(pctime); // Sync Arduino clock to the time received on the serial port
        }
        return count;
    }
}

 

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LEARN ABOUT DEBIAN

ost_time

ost::Time(3)						     Library Functions Manual						      ost::Time(3)

NAME

       ost::Time -

       The Time class uses a integer representation of the current time.

SYNOPSIS

       #include <numbers.h>

       Inherited by ost::Datetime.

   Public Member Functions
       Time (time_t tm)
       Time (tm *dt)
       Time (char *str, size_t size=0)
       Time (int hour, int minute, int second)
       Time ()
       virtual ~Time ()
       long getValue (void) const
       int getHour (void) const
       int getMinute (void) const
       int getSecond (void) const
       char * getTime (char *buffer) const
       time_t getTime (void) const
       tm * getTime (tm *buf) const
       void setTime (char *str, size_t size=0)
       bool isValid (void) const
       operator long ()
       String operator() () const
       Time & operator++ ()
       Time & operator-- ()
       Time & operator+= (const int val)
       Time & operator-= (const int val)
       int operator== (const Time &time)
       int operator!= (const Time &time)
       int operator< (const Time &time)
       int operator<= (const Time &time)
       int operator> (const Time &time)
       int operator>= (const Time &time)
       bool operator! () const

   Protected Member Functions
       void toSeconds (int hour, int minute, int second)
       void fromSeconds (char *buf) const
       virtual void update (void)

   Protected Attributes
       long seconds

   Friends
       Time operator+ (const Time &time1, const Time &time2)
       Time operator- (const Time &time1, const Time &time2)
       Time operator+ (const Time &time, const int val)
       Time operator- (const Time &time, const int val)
       Time operator+ (const int val, const Time &time)
       Time operator- (const int val, const Time &time)

Detailed Description
       The Time class uses a integer representation of the current time.

       This is then manipulated in several forms and may be exported as needed.

       Author:
	   Marcelo Dalmas mad@brasmap.com.br Integer based time class.

Constructor &; Destructor Documentation
   ost::Time::Time (time_ttm)
   ost::Time::Time (tm *dt)
   ost::Time::Time (char *str, size_tsize = 0)
   ost::Time::Time (inthour, intminute, intsecond)
   ost::Time::Time ()
   virtual ost::Time::~Time () [virtual]
Member Function Documentation
   void ost::Time::fromSeconds (char *buf) const [protected]
   int ost::Time::getHour (void) const
   int ost::Time::getMinute (void) const
   int ost::Time::getSecond (void) const
   char* ost::Time::getTime (char *buffer) const
   time_t ost::Time::getTime (void) const
   tm* ost::Time::getTime (tm *buf) const
   long ost::Time::getValue (void) const
   bool ost::Time::isValid (void) const
       Reimplemented in ost::Datetime.

   ost::Time::operator long () [inline]
   bool ost::Time::operator! (void) const [inline]
       Reimplemented in ost::Datetime.

   int ost::Time::operator!= (const Time &time)
   String ost::Time::operator() () const
   Time& ost::Time::operator++ ()
   Time& ost::Time::operator+= (const intval)
   Time& ost::Time::operator-- ()
   Time& ost::Time::operator-= (const intval)
   int ost::Time::operator< (const Time &time)
   int ost::Time::operator<= (const Time &time)
   int ost::Time::operator== (const Time &time)
   int ost::Time::operator> (const Time &time)
   int ost::Time::operator>= (const Time &time)
   void ost::Time::setTime (char *str, size_tsize = 0)
   void ost::Time::toSeconds (inthour, intminute, intsecond) [protected]
   virtual void ost::Time::update (void) [protected],  [virtual]
Friends And Related Function Documentation
   Time operator+ (const Time &time1, const Time &time2) [friend]
   Time operator+ (const Time &time, const intval) [friend]
   Time operator+ (const intval, const Time &time) [friend]
   Time operator- (const Time &time1, const Time &time2) [friend]
   Time operator- (const Time &time, const intval) [friend]
   Time operator- (const intval, const Time &time) [friend]
Member Data Documentation
   long ost::Time::seconds [protected]
Author
       Generated automatically by Doxygen for GNU CommonC++ from the source code.

GNU CommonC++							  Sat Jun 23 2012						      ost::Time(3)
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