Arduino UNIX Time - Syncing Computer UNIX Time to Arduino Time with Python Post: 303042410

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Top Forums Programming Arduino UNIX Time - Syncing Computer UNIX Time to Arduino Time with Python Post 303042410 by Neo on Tuesday 24th of December 2019 12:20:18 AM

12-24-2019

Administrator

Here is the Python 2.7.16 code I quickly put together to send unix time to the Arduino UNO.

I assume it also works on Python3, but I have not tested it because I have not completely upgrade python on my mac pro yet, sorry about that.

Code:

# -----------------------------------------------------------
# Sync Unix Time with Arduino Initial Draft 0.1
# Written on macOS, tested with Python 2.7.16
# Neo, December 2019
# This code needs refinement to be more general
# I will improve this code later when I need to use it in an Arduino project
# For now, it works "OK" and serves it purpose
# Feel free to improve, modify as you like.
# -----------------------------------------------------------
import serial
import time

ser = serial.Serial(
    port='/dev/cu.usbserial-40',  #change this for your device
    baudrate=9600,
    parity=serial.PARITY_NONE,
    stopbits=serial.STOPBITS_ONE,
    bytesize=serial.EIGHTBITS,
    timeout=0)

print("connected to: " + ser.portstr)

# this will store the line
line = []
ux = 0
a = False
debugScript = False
offset = 2 .  #adjust this time offset (in seconds) to account for various time delays in script and transferring via the serial port, etc. to insure the Arduino is in closer sync to the computer
time_int = 1000  # this can be any number greater than zero and less than recent unix time
count = 0
while True:
    if debugScript:
        print(str(int(time.time())))
    for c in ser.read():
        if not a:
            if ux < time_int:
                ser.write("T")
                ux = int(time.time())+offset
                ser.write(str(ux))
                ser.write("\n")
                ser.flush()
                if debugScript:
                    print("unixtime: " + str(ux))
        line.append(c)
        count += 1
        if c == '\n':
            print("Line("+str(count)+"): " + ''.join(line))
            x = int(time.time())+offset
            print("time("+str(count)+"): " + str(x) + "\n")
            line = []
            a = True
            break
ser.close()

Neo

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time::piece::mysql

Time::Piece::MySQL(3pm) 				User Contributed Perl Documentation				   Time::Piece::MySQL(3pm)

NAME

       Time::Piece::MySQL - Adds MySQL-specific methods to Time::Piece

SYNOPSIS

	 use Time::Piece::MySQL;

	 my $time = localtime;

	 print $time->mysql_datetime;
	 print $time->mysql_date;
	 print $time->mysql_time;

	 my $time = Time::Piece->from_mysql_datetime( $mysql_datetime );
	 my $time = Time::Piece->from_mysql_date( $mysql_date );
	 my $time = Time::Piece->from_mysql_timestamp( $mysql_timestamp );

DESCRIPTION

       Using this module instead of, or in addition to, "Time::Piece" adds a few MySQL-specific date-time methods to "Time::Piece" objects.

OBJECT METHODS

   mysql_date / mysql_time / mysql_datetime / mysql_timestamp
       Returns the date and/or time in a format suitable for use by MySQL.

CONSTRUCTORS

   from_mysql_date / from_mysql_datetime / from_mysql_timestamp
       Given a date, datetime, or timestamp value as returned from MySQL, these constructors return a new Time::Piece object.  If the value is
       NULL, they will retrun undef.

   CAVEAT
       "Time::Piece" itself only works with times in the Unix epoch, this module has the same limitation.  However, MySQL itself handles date and
       datetime columns from '1000-01-01' to '9999-12-31'.  Feeding in times outside of the Unix epoch to any of the constructors has
       unpredictable results.

       Also, MySQL doesn't validate dates (because your application should); it only checks that dates are in the right format.  So, your database
       might include dates like 2004-00-00 or 2001-02-31.  Passing invalid dates to any of the constructors is a bad idea: on my system the former
       type (with zeros) returns undef (previous version used to die) while the latter returns a date in the following month.

AUTHOR

       Original author: Dave Rolsky <autarch@urth.org>

       Current maintainer: Marty Pauley <marty+perl@kasei.com>

COPYRIGHT

       (c) 2002 Dave Rolsky

       (c) 2004 Marty Pauley

       This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

       Time::Piece

perl v5.12.4							    2008-06-07						   Time::Piece::MySQL(3pm)