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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pfsdisplayfunction

pfsdisplayfunction(1)					      General Commands Manual					     pfsdisplayfunction(1)

NAME

       pfsdisplayfunction - Apply display function to color or gray-scale images

SYNOPSIS

       pfsdisplayfunction [--display-function <df-spec>] [--to-pixels | --to-luminance] [--help] [--verbose]

DESCRIPTION

       Use  this  command to convert pixel values to luminance / radiance units displayed on a monitor or to perform inverse conversion. This com-
       mand is useful in combination with the HDR-VDP to convert LDR images to luminance maps representing images shown on a  particular  display.
       The  display  function  specification is identical to the specification used in the pfstmo_mantiuk08 tone mapping operator (from the pfstmo
       package).

       If neither --to-luminance nor --to-pixels option is specified, the appropriate conversion direction will be deducted from the LUMINANCE tag
       in the pfs stream.

OPTIONS

       --to-luminance, -l
	      Convert pixel values to absolute luminance / radiance units. For RGB images the same display function is applied in each color chan-
	      nel.

       --to-pixels, -p
	      Convert absolute luminance / radiance units to pixel values. For RGB images the same display function is applied in each color chan-
	      nel.

       --display-function <df-spec>, -d <df-spec>
	      The  display  function  describes how output luminance of a display changes with pixel values. If no parameter is given, the command
	      assumes -df pd=lcd (see Pre-defined display below). There are several ways to specify the display function:

       Gamma-gain-black-ambient display model

	      g=<float>:l=<float>:b=<float>:k=<float>:a=<float>[:n=<float>]

	      Gamma-gain-black-ambient model can approximate a range of displays and is a compact way to specify a display  function.  It  assumes
	      that a display function has the following form:

	      L_d(I) = (l-b)*I^gamma + b + k/pi*a

	      The parameters are as follows:
	      g -  gamma or exponent of a display function (default 2.2, usually from 1.8 to 2.8)
	      l -  peak luminance of a display in cd/m^2  (default 100, from 80 for CRTs to 500 or more for newer displays)
	      b -  black level, which is luminance of a black pixel when the display is on (default 1, usually from 0.3 to 1 cd/m^2)
	      k -  reflectivity of a screen (assuming that it is diffuse) (default 0.01, usually about 0.01 (1%) for LCD displays, more for CRTs)
	      a -  ambient illumination in lux. Typical values are:
		   50 lux Family living room (dim, default)
		   400 lux
			  A brightly lit office
		   32000 lux
			  Sunlight on an average day (min.)
		   100000 lux
			  Sunlight on an average day (max.)

       Pre-defined display

	      pd=<display_type>

	      Use  pre-defined display type. This options are for convenience only and they do not mean to accurately model the response of a par-
	      ticular display.	The following display types are recognized:

	      lcd_office (g=2.2, l=100, b=0.8, k=0.01, a=400 )
		     lcd set to "office" mode seen in bright environment
	      lcd	 (g=2.2, l=200, b=0.8, k=0.01, a=60  )
		     typical lcd seen in dim environment (default)
	      lcd_bright (g=2.6, l=500, b=0.5, k=0.01, a=10  )
		     newer LCD TV seen in dark environment
	      crt	 (g=2.2, l=80,	b=1,   k=0.02, a=60  )
		     CRT monitor seen in dim environment

	      The parameters in the parenthesis are the same as for the gamma-gain-black-ambient model explained above.

       Lookup-table

	      lut=<file>

	      This is the most accurate specification of the display response function, but requires measuring it  with  a  luminance  meter.  The
	      lookup  table  should  account  also for ambient light, so that it is recommended to use the luminance meter that can measure screen
	      luminance from a distance, such as Minolta LS-100 (as opposed to those that use rubber tube touching a display that  eliminates  the
	      influence  of ambient light). The <file> must be a comma-separated text file in a format (CSV) with two columns: first column repre-
	      sents pixel values (from 0.0 to 1.0) and the second physical luminance in cd/m^2. Both the pixel	value  and  the  luminance  should
	      increase in each raw.

EXAMPLES

       pfsin barbara.jpg | pfsdisplayfunction -l -d pd:crt -v  | pfsout barbara_crt.hdr

	      Convert  barbara.jpg  image  from  pixel	values	to a luminance map of the image shown on a CRT monitor and store the map as an HDR
	      image.

SEE ALSO

       pfsgamma(1) pfstmo_mantiuk08(1)

BUGS

       Please report bugs and comments to the pfstools discussion group (http://groups.google.com/group/pfstools).

															     pfsdisplayfunction(1)