Arduino UNIX Time - Syncing Computer UNIX Time to Arduino Time with Python Post: 303042409

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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

12-24-2019

Administrator

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;
    }
}

Neo

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LEARN ABOUT HPUX

pcserver

pcserver(1M)															      pcserver(1M)

NAME

       pcserver - Basic Serial and HP AdvanceLink server

SYNOPSIS

       [log_file]]

DESCRIPTION

       is the hostside server program for Basic Serial and AdvanceLink, and is started and terminated by an application program running on a PC.

       supports both the Basic Serial and the AdvanceLink protocols.

       Basic Serial offers a library of routines that support a variety of services between a PC and a serially connected host computer, including
       file transfers and remote interprocess communications.

       AdvanceLink is a terminal emulation program that also supports file transfers between a PC and host system over	various  physical  connec-
       tions.

   Options
       The following options are recognized by pcserver:

	      This option is now obsolete, but is retained for compatibility
			  with	earlier  versions  of  software.   Logging  is now controlled by the presence or absence of the server.pro file as
			  described in NOTES, below.  Enables packet logging and records messages to a specified log  file  (for  debugging).	If
			  logfile  is not specified, the file is used in the default logging directory, as defined in the file.  looks for a local
			  version of server.pro in the user's home directory.  If none is found, it will look for a system-wide version as  or	If
			  the exists, logging is appended to it.  If the file does not exist, logging is disabled.

	      Informs	  that a "netmode" for data encryption should be used during special operations (for example,  a netmode is needed to mask
			  device control characters when a PAD is being used).	The details of the netmode are then negotiated between the and the
			  PC application.  For a more comprehensive discussion on netmode, see

	      Causes	  to print its version number to standard output and quit.

       is  designed  to  be  invoked  by  a PC application program rather than from the command line.  In order for the connection to be correctly
       established, the PC and host port must be properly configured.

       If you are using to manage a session between a PC and a hostside application (via Basic Serial), you may need to use a Basic Serial connec-
       tion  file  to  actually  log  in  to your account.  Establishing connections using Basic Serial connection files is a sensitive operation.
       Before attempting to use them, you should read the manual

       If you are using to transfer files between a PC and a host machine via Advancelink, use the following AdvanceLink commands:

       If your prompt does not end with replace the in the terminator command with the last character in your normal prompt.

       To permanently configure AdvanceLink for the HP-UX version of refer to the manual for more information.

NOTES

       Packet logging is controlled by the presence or absence of the file

       looks for a local version of in the user's home directory.  If none is found, it will look for a system-wide version as or

       If no logging file is found in these directories, logging is not performed.  A commented example of a may be found in or  To  make  use	of
       this file, copy it to the active file name, in one of the previously mentioned directory locations.

       If  your  screen displays a message when you choose START TRANSFER from AdvLink, either has not yet been installed on your HP-UX system, or
       it has been installed in a directory that is not part of your current path.

       HP-UX treats files containing binary or ASCII data identically.	Therefore it is up to the user to specify the desired file type when using
       to  transfer files with Advancelink.  The difference between the two is that during ASCII transfers, maps HP-UX line-feed characters to the
       MS-DOS carriage-return/line-feed pair.  This produces incorrect results when transferring a binary file as an ASCII file.

       Also, older versions of AdvanceLink show totally inaccurate estimates for file transfer times.  This does not  interfere  with  the  actual
       transfer.

       If  the	PC is reset while a transfer is taking place, it may temporarily appear to be a "dead" terminal port.  This is no cause for alarm;
       left to its own devices, will restore the port in a short time.	In the worst case, it could take six timeout periods (6x20 = 120 seconds).
       For faster response, press the Break key a few times to terminate immediately.

FILES

       the executable program
       system-wide logging profile
       system-wide logging profile
       local logging profile
       commented inactive example of server.pro
       commented inactive example of server.pro

SEE ALSO

       Describes protocol and how to use AdvanceLink.

       Describes Basic Serial and how connection files should be used.

																      pcserver(1M)