I am running Debian on a BBB. I have written a simple python program to monitor temperatures and control relays based on the readings. It is critical for the program to run at all times, and therefore to start after boot, in case of power failures. I use Tkinter to open a window that displays the temperatures. When I just run the program it works fine. When I use cron to start it, either at reboot, or at scheduled times, I can hear the relays click during the startup portion of the program, but then it quits, and the display window never opens. I'm not sure how to debug since it works when its not started by cron. THX
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