5

I'm trying to utilize a Pi on a high altitude balloon where I just stick the pi in and go, when I get it back though to shut it down...is there a safe way without access to monitor, keyboard, etc?

It seems when I turn on Pi, let it run, and THEN plug in an ethernet cable, it won't connect oto the network properly

7

If there is anything at all attached to the usb ports, you can use a udev rule such that unplugging the device will trigger a clean shutdown. I've already written a summary of the process, so I won't repeat it here. You could also do this with regard to an ethernet cable.

5

You could run a script, perhaps in Python or C that checks the status of a GPIO pin and then connect up a push button to that GPIO pin. Then when the button is pressed, the script could trigger the shutdown.

1

Assuming you know roughly how long the pi needs to run (battery capacity etc), just have a process that sleeps for X seconds and then shuts it down.

1

I like the button on the GPIO option to force a shutdown but I would not actually install a button for the flight I would leave the pins disconnected and jumper them once on the ground -- no chance to accidentally press the button while in flight.

I assume you are using the Pi for data collection which mean you probably don't want to lose data even if the power is lost during the flight.

I would look into setting up your system in a way that minimizes the chance of data loss if power is lost -- that way you don't need to worry too much if it is shutdown properly.

See this question for some ideas: https://serverfault.com/questions/356507/safe-ext4-configuration-for-systems-running-unattended

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