I hope someone can help me out or point me in the right direction. Please be gentle, I'm new here.

First of all, I am running my "observatory" using a RPi 4 with astroberry. Kstars ,INDI and EKOS. All is working well.

I have a DIY (3d printed etc) dust cover with a built in electroluminescent light panel which I open and close using a servo.
So far I have FirmataStandard running on my Arduino and I can connect to it from the INDI control panel over USB.

Once connected I can position the servo and switch the EL panel from the INDI control panel but I wanted to schedule these things to happen as part of the imaging schedule and I can't work out how to do this.

Any help would be appreciated.

BW, Chris Mills