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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ldattach

LDATTACH(8)						     Linux Programmer's Manual						       LDATTACH(8)

NAME

       ldattach - attach a line discipline to a serial line

SYNOPSIS

       ldattach [-dhV78neo12] [-s speed] ldisc device

DESCRIPTION

       The  ldattach  daemon  opens the specified device file (which should refer to a serial device) and attaches the line discipline ldisc to it
       for processing of the sent and/or received data.  It then goes into the background keeping the device open  so  that  the  line	discipline
       stays loaded.

       The line discipline ldisc may be specified either by name or by number.

       In order to detach the line discipline, kill(1) the ldattach process.

       With no arguments, ldattach prints usage information.

LINE DISCIPLINES

       Depending on the kernel release, the following line disciplines are supported:

       TTY(0) The  default  line discipline, providing transparent operation (raw mode) as well as the habitual terminal line editing capabilities
	      (cooked mode).

       SLIP(1)
	      Serial Line IP (SLIP) protocol processor for transmitting TCP/IP packets over serial lines.

       MOUSE(2)
	      Device driver for RS232 connected pointing devices (serial mice).

       PPP(3) Point to Point Protocol (PPP) processor for transmitting network packets over serial lines.

       STRIP(4)

       AX25(5)

       X25(6) Line driver for transmitting X.25 packets over asynchronous serial lines.

       6PACK(7)

       R3964(9)
	      Driver for Simatic R3964 module.

       IRDA(11)
	      Linux IrDa (infrared data transmission) driver - see http://irda.sourceforge.net/

       HDLC(13)
	      Synchronous HDLC driver.

       SYNC_PPP(14)
	      Synchronous PPP driver.

       HCI(15)
	      Bluetooth HCI UART driver.

       GIGASET_M101(16)
	      Driver for Siemens Gigaset M101 serial DECT adapter.

       PPS(18)
	      Driver for serial line Pulse Per Second (PPS) source.

OPTIONS

       -d | --debug
	      Causes ldattach to stay in the foreground so that it can be interrupted or  debugged,  and  to  print  verbose  messages	about  its
	      progress to the standard error output.

       -h | --help
	      Prints a usage message and exits.

       -V | --version
	      Prints the program version.

       -s value | --speed value
	      Set the speed of the serial line to the specified value.

       -7 | --sevenbits
	      Sets the character size of the serial line to 7 bits.

       -8 | --eightbits
	      Sets the character size of the serial line to 8 bits.

       -n | --noparity
	      Sets the parity of the serial line to none.

       -e | --evenparity
	      Sets the parity of the serial line to even.

       -o | --oddparity
	      Sets the parity of the serial line to odd.

       -1 | --onestopbit
	      Sets the number of stop bits of the serial line to one.

       -2 | --twostopbits
	      Sets the number of stop bits of the serial line to two.

SEE ALSO

       inputattach(1), ttys(4)

AUTHOR

       Tilman Schmidt (tilman@imap.cc)

AVAILABILITY

       The ldattach command is part of the util-linux-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.

Linux 2.6							  14 January 2008						       LDATTACH(8)