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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 FREEBSD

uplcom

UPLCOM(4)						   BSD Kernel Interfaces Manual 						 UPLCOM(4)

NAME

     uplcom -- USB support for Prolific PL-2303/2303X/2303HX serial adapters driver

SYNOPSIS

     To compile this driver into the kernel, place the following lines in your kernel configuration file:

	   device usb
	   device ucom
	   device uplcom

     Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):

	   uplcom_load="YES"

DESCRIPTION

     The uplcom driver provides support for various serial adapters based on the Prolific PL-2303, PL-2303X and PL-2303HX USB-to-RS232 Bridge
     chips.

     The device is accessed through the ucom(4) driver which makes it behave like a tty(4).

HARDWARE

     The uplcom driver supports the following devices and adapters:

     o	 ADLINK ND-6530 USB-Serial Adapter
     o	 Alcatel One Touch 535/735 Phone
     o	 Alcor AU9720 USB-RS232 Serial Adapter
     o	 AlDiga AL-11U Modem
     o	 Alltronix ACM003U00 Modem
     o	 Anchor Serial adapter
     o	 ATEN UC-232A
     o	 BAFO BF-800 and BF-810
     o	 Belkin F5U257
     o	 BenQ S81 Phone
     o	 Corega CG-USBRS232R Serial Adapter
     o	 Cressi Edy (Seiko) Diving Computer
     o	 ELECOM UC-SGT Serial Adapter
     o	 HAL Corporation Crossam2+USB IR commander
     o	 Hama USB RS-232 Serial Adapter
     o	 Hamlet exagerate XURS232
     o	 HP LD220 Point-Of-Sale (POS) Display
     o	 IOGEAR UC-232A
     o	 I/O DATA USB-RSAQ, USB-RSAQ2, USB-RSAQ3 and USB-RSAQ5
     o	 iTegno WM1080A GSM/GFPRS Modem
     o	 iTegno WM2080A CDMA Modem
     o	 Leadtek 9531 GPS
     o	 Micromax 610U Modem
     o	 Microsoft Palm 700WX
     o	 Mobile Action MA-620 Infrared Adapter
     o	 Motorola Cables
     o	 Nokia CA-42 Cable
     o	 OTI DKU-5 cable
     o	 Panasonic TY-TP50P6-S flat screen
     o	 PLX CA-42 Phone Cable
     o	 PLANEX USB-RS232 URS-03
     o	 Prolific Generic USB-Serial Adapters
     o	 Prolific Pharos USB-Serial Adapter
     o	 RATOC REX-USB60
     o	 Radio Shack USB Serial Cable
     o	 Sagem USB-Serial Adapter
     o	 Samsung I330 Phone Cradle
     o	 Sandberg USB to Serial Link (model number 133-08)
     o	 Sanwa KB-USB2 Multimeter cable
     o	 Siemens/BenQ EF81, SX1, X65 and X75 Mobile Phones
     o	 Sitecom USB-Serial Adapter
     o	 SMART Technologies USB-Serial Adapter
     o	 Sony QN3 Phone Cable
     o	 Sony Ericsson Datapilot
     o	 Sony Ericsson DCU-10 and DCU-11 (Susteen) USB Cables
     o	 SOURCENEXT KeikaiDenwa 8 (with and without charger)
     o	 Speed Dragon USB-Serial Cable
     o	 Syntech CPT-8001C Barcode Scanner
     o	 TDK UHA6400 and UPA9664 USB-PHS Adapters
     o	 TRENDnet USB to Serial Converter (TU-S9)
     o	 Tripp-Lite U209-000-R USB-Serial Adapter
     o	 UIC HCR331 Magnetic Stripe Card Reader
     o	 UIC MSR206 Magnetic Stripe Card Reader
     o	 Willcom W-SIM DD PHS terminal.(WS002IN)
     o	 YC-Cable USB-Serial Adapter
     o	 Zeagle N2iTion3 Diving Computer

SEE ALSO

     tty(4), ucom(4), usb(4)

HISTORY

     The uplcom driver appeared in NetBSD 1.6.	This manual page was adopted from NetBSD by Tom Rhodes <trhodes@FreeBSD.org> in April 2002.

BSD
								   July 25, 2012							       BSD
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