Help me to science :)

Hi, I'm new here and new to PL. I've been reading through the posts but have not figured out what I should do.

I have three air pumps running at different intensities (low, med, high). They are on S1, S2, and S3.
I need them to operate in sequence S1-S2-S3 for 10 seconds each but with a random time delay start for each pump.

In other words, I need S1 air pump to start between 3600s and 4800s then be on for 10 seconds and then shut off.
Then S2 pump timer starts and the air pump is activated sometime between 3600s and 4800s for 10 seconds,
then S3...

The sequence of S1-S2-S3 would need to run for 24hours then stop.

Sounds weird, maybe but I am recording cephalopods for my research and I'm running air through air stones to see how they react when they are alert/active vs. when they look like they are asleep. It's a way to test whether what they are doing can be defined as sleep. (They should be less responsive when in the sleep-like state.)

I thought I could use switching cycles with three pairs of ON-OFF commands but the limit is 6 cycles so on the short end that may end up with the air stopping after 19 hours instead of 24.

I tried working with the "wave maker" with group settings and had the pumps alternating one after the other using Sequence 1 (or 2). They were each on for 10 seconds one right after the other but I couldn't see how to introduce a window (3600-4800s) delay between pump activation.

This brings me to thinking I may need PL but I am making myself dizzy trying to figure it out. I can't figure out if the sockets should be assigned to a Timer 1-3 or to a GroupPump 1-3, or to a PL.
I want to understand PL so I can program other stuff eventually- it's a really powerful tool! I've seen reference to a PL manual here but the link is a dead end.

1) Could someone post a link to the PL manual and any other guides for GHL PL?
2) If you have a solution to the air pump problem, I'd love to hear it!
3) Please dumb down any explanations as I am a complete novice.
4) Thank you for your time and patience. It is very much appreciated!

No one can help with this?

Is there a way to simply introduce a delay between pump activation in the Stream Group with Sequence1 (or2)?

I wrote to GHL customer support and got this response from Thilo. In case it helps someone else, I am posting the answer here. It worked perfectly for me.


Thilo writes:
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This scenario is not easy to implement. It took me some time, but I found a solution for you:

1) For each pump add a programmable logic with function "Pulse", time 10s
Programmable logic

Attachment 10582

2) At the outlets S1-S3 (your pumps) add programmable logic 1-3 Outlets

Attachment 10580

3) Configure a stream group:
Add all three pumps
Set start- and end time (with your sequence duration of 6-9 hours)
Select mode "Sequence 1" with min. duration of 10min plus 10s and max. duration of 20min plus 10s
Stream group

Attachment 10581


With this settings the first sequence starts immediately after stream groups start time, but then there always will be a pause of 10-20 minutes.


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Best regards / Mit freundlichen Grüßen,

Thilo
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