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Arduino UNIX Time - Syncing Computer UNIX Time to Arduino Time with Python
Post 303042446 by Neo on Wednesday 25th of December 2019 04:22:25 AM
12-25-2019
Administrator
As a side note:
I notice that when I use launchd and cron on my mac to keep an Arduino UNO in sync, that I cannot update the Arduino code though the IDE unless I unload the launchd file, stop the cron entry (actually, if fast do not need to modify cron) and power cycle the Arduino.
This takes more time than I like (unloading and loading launchd, editing and restarting cron twice, hard resetting the Arduino), so as a work around, I can update the Arduino on a different mac and then connect the updated Arduino back to the mac running launchd and cron on the required serial port. Note: If I'm fast, can get by not editing and restarting the crontab.
Today, I am experimenting with a 650nm (red) laser and was going to use this little laser to transmit and sync unix time to a remote receiver; but I don't have an optical receiver in my parts box yet.
I do have a long range RF transmitter and receiver in the mail from China, as well as a 3G module, so I maybe I'll transmit and sync unix time to my Ninja, for fun.
Actually, I need to think of some very cool, "science-project-like" Arduino project which is not already on YT or in the Arduino forums. I am thinking to do something with my motorcycle, time, position, and speed via 3G back to my home and store the results (tracking) in a database; but that sounds "too easy"
(waiting on parts). Then I thought, I would create a RF network and transmit unix time as a beacon, but we have GPS for that. Haha....
Any crazy ideas (not already on YT)?
I notice that when I use launchd and cron on my mac to keep an Arduino UNO in sync, that I cannot update the Arduino code though the IDE unless I unload the launchd file, stop the cron entry (actually, if fast do not need to modify cron) and power cycle the Arduino.
This takes more time than I like (unloading and loading launchd, editing and restarting cron twice, hard resetting the Arduino), so as a work around, I can update the Arduino on a different mac and then connect the updated Arduino back to the mac running launchd and cron on the required serial port. Note: If I'm fast, can get by not editing and restarting the crontab.
Today, I am experimenting with a 650nm (red) laser and was going to use this little laser to transmit and sync unix time to a remote receiver; but I don't have an optical receiver in my parts box yet.
I do have a long range RF transmitter and receiver in the mail from China, as well as a 3G module, so I maybe I'll transmit and sync unix time to my Ninja, for fun.
Actually, I need to think of some very cool, "science-project-like" Arduino project which is not already on YT or in the Arduino forums. I am thinking to do something with my motorcycle, time, position, and speed via 3G back to my home and store the results (tracking) in a database; but that sounds "too easy"
(waiting on parts). Then I thought, I would create a RF network and transmit unix time as a beacon, but we have GPS for that. Haha.... Any crazy ideas (not already on YT)?
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LEARN ABOUT OSF1
cron
cron(8) System Manager's Manual cron(8) NAME
cron - The system clock daemon SYNOPSIS
/usr/sbin/cron DESCRIPTION
The cron daemon runs shell commands at specified dates and times. Commands that are to run according to a regular or periodic schedule are found within the crontab files. Commands that are to run once only are found within the at files. You submit crontab and at file entries by using the crontab and at commands. Because the cron process exits only when killed or when the system stops, only one cron daemon should exist on the system at any given time. Normally, you start the cron daemon from within a run command file. During process initialization and when cron detects a change, it examines the crontab and at files. This strategy reduces the overhead of checking for new or changed files at regularly scheduled intervals. The cron command creates a log of its activities. The cron daemon must be started from the system startup scripts because it must begin execution without a login user ID set. The cron daemon starts each job with the following process attributes stored with the job by the invoking process: Login user ID Effective and real user IDs Effective and real group IDs Supplementary groups It also establishes the following attributes from the authentication profile of the account associated with the login user ID of the invok- ing process: Audit control and disposition masks Kernel authorizations DIAGNOSTICS
The at and batch programs will refuse to accept jobs submitted from processes whose login user ID is different from the real user ID. FILES
Specifies the command path. Main cron directory Directory containing the crontab files. List of allowed users. List of denied users His- tory information for cron Queue description file for at, batch, and cron RELATED INFORMATION
Commands: at(1), crontab(1), rc0(8), rc2(8), rc3(8) Files: queuedefs(4) delim off cron(8)