I need to make a controller for lighting... help

[reeftr]

G Greetings to everyone... I want to make a bar led as you can see on the bottom, but my most important problem is that I need to make a controller with at least 8 channels, but I need to make a device that is both cheap and useful. I would be very happy if you help

 

[GoVols]

@Orphek

Do you know of a way?

Thanks