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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

procmeterrc

PROCMETERRC(5)							File Formats Manual						    PROCMETERRC(5)

NAME

       procmetetrc  -  The  procmeterrc  configuration file for procmeter3, procmeter3-xaw, gprocmeter3, procmeter3-gtk1, procmeter3-gtk2, procme-
       ter3-log and procmeter3-lcd programs.

SYNOPSIS

       This file contains the run-time options for the procmeter3, procmeter3-xaw, gprocmeter3, procmeter3-gtk1,  procmeter3-gtk2,  procmeter3-log
       and procmeter3-lcd programs.  These include the outputs that are displayed, the colours and fonts that are used (for X window outputs), the
       LCDproc server (for the procmeter-lcd version) and other program options.

DESCRIPTION

       The resources for ProcMeter version 3.x are stored in the .procmeterrc file instead of using X resources.  This gives more flexibility  and
       allows for much simpler customisation.

       When  the  procmeter3,  procmeter3-xaw,	gprocmeter3, procmeter3-gtk1, procmeter3-gtk2, procmeter3-log or procmeter3-lcd programs start the
       .procmeterrc file is searched for in the current directory, the current users home directory or the system default  installation  directory
       (named procmeterrc).  The file is used from the first one of these locations that matches.

       The  format  of	the  .procmeterrc  file  is  a	number	of  sections with the section names marked in '[]'.  As well as the fixed sections
       (described below) there is a section for each module that is named using the name that the module reports itself to  be.   There  are  then
       further sections for each of the possible outputs of each module.  The names of the sections and parameters are not case sensitive although
       the values that they are given may be.  Lines beginning with the characters ';' or '#' are comments and continuation using the ''  charac-
       ter at the end of a line is allowed.

       Below is listed the resource values and the sections of the .procmeterrc file that they can exist in.

library SECTION
       This section contains the information about the ProcMeter modules that are available.  This applies to all versions of the program.

       path=...
	      The pathname of the library that contains the compiled ProcMeter modules.  (defaults to the program's compiled-in installation loca-
	      tion).

       others=...
	      A list of other modules to be loaded (full pathnames separated by spaces).

startup SECTION
       This section controls how the ProcMeter window should look when the program is started.

       order=...
	      A list of the outputs that are to be started up in the order that they are to be displayed (separated by spaces).  If  command  line
	      options are also specified then they appear after those specified here.

resources SECTION
       This section contains the general program display resources.  Not all of the options apply to all of the versions of the program.  Specific
       versions that the options apply to are specified below.

       horizontal=...
	      A Boolean to indicate that the outputs are stacked horizontally instead of the default which  is	vertically.  (For  X  versions	of
	      procmeter3 only.)

       background=...
	      The  colour  to  use as the default background for all outputs. (An X11 colour name or an RGB value in hex as #RRGGBB.)  (For X ver-
	      sions of procmeter3 only.)

       foreground=...
	      The colour to use as the default foreground for all outputs. (An X11 colour name or an RGB value in hex as #RRGGBB.)   (For  X  ver-
	      sions of procmeter3 only.)

       label-font=...
	      The font to use for the label that describes the output. (An X11 font name.)  (For X versions of procmeter3 only.)

       label-foreground=...
	      The  colour  to  use  as	the  foreground for the label. (An X11 colour name or an RGB value in hex as #RRGGBB.)	(For X versions of
	      procmeter3 only.)

       label-position=...
	      The position of the label relative to the body of the output.  (Either top, bottom or none.)  (For X versions of procmeter3 only.)

       grid-foreground=...
	      The colour to use for the grid lines. (An X11 colour name or an RGB value in hex as #RRGGBB.)  (For X versions of procmeter3 only.)

       graph-solid=...
	      A boolean to indicate if the graph should be solid (the default) or a single line.  (yes or no, true or false, 0 or 1.)  (For X ver-
	      sions of procmeter3 only.)

       grid-min=...
	      The  minimum  number  of grid lines to display on a graph or bar chart.  (An integer.)  (For X and LCD versions of procmeter3 only.)
	      This is particularly important with the bar chart because with this set too low the bar will always be the same length on screen and
	      the number of grid lines will change with the data.

       grid-max=...
	      The maximum number of grid lines to display on a graph or bar chart.  (An integer.)  (For X and LCD versions of procmeter3 only.)

       text-font=...
	      The font to use for the textual outputs.	(An X11 font name.)  (For X versions of procmeter3 only.)

       menu-foreground=...
	      The  colour  to  use  as the foreground for the menus.  (An X11 colour name or an RGB value in hex as #RRGGBB.)  (For procmeter3 and
	      procmeter3-xaw only.)

       menu-background=...
	      The colour to use as the background for the menus.  (An X11 colour name or an RGB value in hex as  #RRGGBB.)   (For  procmeter3  and
	      procmeter3-xaw only.)  (The background of all items on the same menu must be the same due to the Xaw Widget set used.)

       menu-font=...
	      The font to use for the menus.  (An X11 font name.)  (For procmeter3 and procmeter3-xaw only.)

       update=...
	      The update interval for the output in seconds (an integer).

LCD SECTION

       This section contains parameters that are only used by the procmeter3-lcd version of the program.

       host=...
	      The name of the host that the LCDd daemon is running on.

       port=...
	      The port number that the LCDd daemon is running on.

       duration=...
	      The length of time that all of the ProcMeter outputs are displayed on the LCD display for before cycling to the next.

       priority=...
	      The  priority of all of the ProcMeter outputs when they are displayed on the LCD display.  This values should be a numeric value for
	      LCDd verions before 0.5 or priority names for later versions.  Using numeric values will likely fail for LCDd versions after 0.5 due
	      to a bug in LCDd.  The safest solution is not to use this option unless you are sure what value to use.

MODULE SECTION

       The name of the section is the name of the ProcMeter module (see the help, procmeter3 -h), for example: ProcMeter

       These can contain any of the resource values which will then apply to all outputs of this module.  There are also extra options that can be
       applied to the module and as defaults for the all of the outputs of that module.

       options=...
	      A string containing options that are passed to the module at startup, different modules have  different  options,  see  the  procme-
	      ter3_modules(1) manual page.

       graph-scale=...
	      The scaling of the graph or bar chart, the number of units between each of the grid lines (an integer).

       run=...
	      A  string  that  specifies  a  program  that can be run by selecting it from the menu for the left mouse button.	(For X versions of
	      procmeter3 only.)  The way that the command is run can be specified using one of the following abbreviations; XTerm(  command  )	to
	      run  command in an xterm then exit.  XTermWait( command ) to run command in an xterm and wait for user input before exiting.  Shell(
	      command ) to run command in an shell and exit.  This last one is equivalent to using none of these abbreviations.

OUTPUT SECTION

       The name of the section is the name of the ProcMeter output (see the help, procmeter3 -h), for example: ProcMeter.Version

       The output sections can contain any of the resource or module options (except 'options') which will then apply only to the  specified  out-
       put.  There are also options that can only be applied to individual outputs.

       label=...
	      Changes the default label for the output to the specified string.

EXAMPLE

       Below is an example .procmeterrc file, it is a much reduced version of the system default procmeterrc file.

	[startup]

	# ProcMeter version, clock, CPU graph, load text
	order=ProcMeter.Version Date_Time.Time_HM 
	      Statistics.CPU-g Processes.Load-t

	[resources]

	# The outputs, black on white
	foreground = black
	background = white

	# A large-medium size text font.
	text-font = 8x13

	# Solid graphs with at least 5 grid lines in grey.
	graph-solid = yes
	grid-min = 5
	grid-foreground = grey50

	# Black on white output labels, small font, below the data.
	label-font = 5x7
	label-foreground = black
	label-position = bottom

	# Black on white menu items in a small-medium size font.
	menu-foreground = black
	menu-background = white
	menu-font = 7x13

	[ProcMeter.Version]

	# A smaller font than normal with no label.
	text-font = 6x10
	label-position = none

	[Statistics]

	[Statistics.CPU]

	# The minimum number of grid lines, they are 20% each.
	grid-min = 5

	[Processes]

	run = XTerm(top)

	[Network]

	# To pick up extra devices not automatically recognised.
	#options=ppp0 slip0

FILES

       ./.procmeterrc

       ~/.procmeterrc

       /usr/local/lib/X11/ProcMeter3/procmeterrc or /usr/lib/X11/ProcMeter3/procmeterrc

SEE ALSO

       procmeter3(1),  procmeter3-xaw(1),  gprocmeter3(1),  procmeter3-gtk1(1),  procmeter3-gtk2(1), procmeter3-log(1), procmeter3-lcd(1), procme-
       ter3_modules(1).

AUTHOR

       Andrew M. Bishop 1998-2007

								   July 3, 2010 						    PROCMETERRC(5)
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