There's an app for that

[greenlake]

...or you could just get the missus to do it

[Halo Jones]

machine tells you when it's full. tells you how much powder to put in and into which compartment in the detergent tray,

The melee range have a system called twin dos: you load in 2 large cartridges & it uses as much detergent & conditioner as is required for the setting (fabric, temp & degree of soiling)

I put cartridges in a month ago & they are still going strong, they are comparably priced to similar products, do a good job & smell nice

It will also tell you if you have over-loaded the machine