Light scheduler with analog outputs; ramp up and down

Hello degregoriis,

at first welcome to the forum. 

degregoriis

Any examples available ? There must be other similar projects.

How do you know that there must be similar projects?
Or do you just suspect it?
And how big can the differences be so that it is still "similar" for you?
Even small differences can lead to very different programming. 

degregoriis

- 10 am to 11 am, ramping up to 5 volt

- 11 am to 8 pm, steady at 7 volt

- from 8 pm to 9 pm ramping down to 0 volt

That makes no sense for me ...
Increase from 0V to 5V within one hour (from 10 a.m. to 11 a.m.) with a ramp function and then immediately switch to 7V at 11 am.
Why not immediately with the ramp function from 0V to 7V?

In the attachment a possible implementation according to your specifications.

I know the meaning and the function of a ramp for an aquarium, you don't need to explain that to me.

It would be more important that you provide precise Information.

 You wrote first:

degregoriis

- 10 am to 11 am, ramping up to 5 volt

- 11 am to 8 pm, steady at 7 volt

- from 8 pm to 9 pm ramping down to 0 Volt

degregoriis

for a saltwater reef tank, it's best that the lights ramp up to a low intensity , stay there for some time, then ramp up to a higher intensity for a longer period to then ramp down over a number of hours. Simulating the sun...