Day/Night via Sunrise/Sunset

[Justindu]

Having a static time preference is problematic for day/night switch. This requires constant updates.

If the day/night switch used a sunset/sunrise option - with an +/- time offset for personal preference, then it would manage itself without having to wire in additional GPIO connections.

The functions that find sunset/sunrise need a date and some local info, like a city (for longitude/latitude), to calculate the time dynamically.

[BlueWave]

The easiest way so far would be to write some simple script that runs and checks sunset/sunrise time before each start of OpenAuto Pro and modifies its config accordingly.

[Justindu]

The easiest way so far would be to write some simple script that runs and checks sunset/sunrise time before each start of OpenAuto Pro and modifies its config accordingly.

Yes - can do.  I need to know what file to update. Can you provide the location and syntax?

Thank you
Justin

[BlueWave]

It is well described in docs at https://www.bluewavestudio.io/community/...p?tid=2042&pid=11925#pid11925

[Justindu]

This is the solution I came up with:

#!/usr/bin/env python3
# Author: Justin DuBois
# Required library - astral -
# If missing, execute 'pip3 install astral'

import os
import datetime
from datetime import datetime
from datetime import date
from astral import LocationInfo
from astral.sun import sun

inifile="/home/pi/.openauto/config/openauto_system.ini"

# --------- Find today's sunise and sunset hour and minuet in city location ----------------
city = LocationInfo("San Francisco", "Pacific", "America/Los_Angeles", 37.77397, -122.431297)
#print((
#    f"Information for {city.name}/{city.region}\n"
#    f"Timezone: {city.timezone}\n"
#    f"Latitude: {city.latitude:.02f}; Longitude: {city.longitude:.02f}\n"
#))

s = sun(city.observer, date=date.today(), tzinfo=city.timezone)
csrise = (s["sunrise"]).strftime('%H:%M')
csset = (s["sunset"]).strftime('%H:%M')

#-- search in OAP system file for sunrise and sunset values --
with open(inifile, 'r',encoding = 'utf-8') as f:
    for line in f:
        keyword = 'SunriseTime'
        if line.startswith(keyword):
            try:
                inisunrise = (line.split('=')[1].rstrip())
            except:
                print ("Error finding SunriseTime in openauto_system.ini")
       
        keyword = 'SunsetTime'
        if line.startswith(keyword):
            try:
                inisunset = (line.split('=')[1].rstrip())
            except:
                print ("Error reading SunsetTime in openauto_system.ini")


# ----------- Update ini file ------------
# Read in the file
with open(inifile, 'r',encoding = 'utf-8') as file :
  filedata = file.read()

#print('inisunrise=',inisunrise)
#print('csrise=',csrise)
#print('inisunset=',inisunset)
#print('csset=',csset)

# Replace the target string
filedata = filedata.replace('SunriseTime='+inisunrise, 'SunriseTime='+csrise)
filedata = filedata.replace('SunsetTime='+inisunset, 'SunsetTime='+csset)

# Write the file out again
with open(inifile, 'w',encoding = 'utf-8') as file:
  file.write(filedata)

[KreAch3R]

.......................

Hey, Justin, thanks for sharing this! I think I got it to work. Can you tell me which way you used to make it run on each startup?


EDIT: Well I liked the script too much and thought about making it better by adding dynamic geolocation using the GPS a lot of us have on our devices, and if that doesn't exist, IP based geolocation (needs internet). Retained the manual way though. And added a second way to get the sunrise/sunset values besides the astral module. 
You can find my revision here:
https://github.com/KreAch3R/daynightlocation

I thought about running it in the startup and I'm using the common systemd service way.

[Justindu]

.......................

Hey, Justin, thanks for sharing this! I think I got it to work. Can you tell me which way you used to make it run on each startup?


EDIT: Well I liked the script too much and thought about making it better by adding dynamic geolocation using the GPS a lot of us have on our devices, and if that doesn't exist, IP based geolocation (needs internet). Retained the manual way though. And added a second way to get the sunrise/sunset values besides the astral module. 
You can find my revision here:
https://github.com/KreAch3R/daynightlocation

I thought about running it in the startup and I'm using the common systemd service way.

I created an executable .sh that I run at startup - like so:

#!/bin/sh
#Updatesuntime.sh
#run this at startup. Add the line below before openauto launch in file /etc/xdg/lxsession/LXDE-pi/autostart
#@/home/pi/Updatesuntime.sh
DISPLAY=:0.0 XAUTHORITY=/home/pi/.Xauthority python3 /home/pi/Updatesuntime.py &