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Is it possible to show boot log or info on a character LCD that the Raspberry Pi is still booting?

I'm using a generic 16x2 character LCD

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    Besides cron as per @aklingam's answer you can try to make a systemd script that runs at boot. (something like this askubuntu.com/questions/919054/…). I'm not sure when it gets called if you enable the unit.
    – Swedgin
    Aug 11 '20 at 13:33
  • systemd could be much better as it runs earlier(?) than cron (1). I'll try it out, thanks!
    – admin
    Aug 11 '20 at 13:59
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    I just realized showing boot log on a 16x2 character LCD is a bit ambitious and absurd. I will go ahead with showing text info instead.
    – admin
    Aug 11 '20 at 14:02
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You could create a simple python script that runs on startup with Cron. That script would display whatever you want for a small amount of time and then end. This would effectively tell you when your Pi's done with booting or if it still is.

You can enter this to edit crontab: crontab -e. Select Nano or any editor you're comfortable with and add a line like this: @reboot python3 /home/pi/your_script.py. I recommend you read the documentation for Cron if you haven't used it before: https://www.raspberrypi.org/documentation/linux/usage/cron.md.

Edit: If you want it to be on during startup and off once booting is over, you could use a transistor to create an inverter (NOT Gate).

schematic

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  • This is what I'm going for if I couldn't do it during boot. I'd like to display on the character LCD during boot.
    – admin
    Aug 11 '20 at 12:55

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