Cat mate's rotating feeder works well for this. You dish out 5 portions, pop some ice packs underneath it and it will rotate at the given time to reveal the foo

Cat mate's rotating feeder works well for this. You dish out 5 portions, pop some ice packs underneath it and it will rotate at the given time to reveal the food. Not perfect but it lasts ok overnight, especially if you put in the next morning's food frozen. I did start building an arduino powered copy of it using a peltier plate and some fly prevention mechanisms. The prototype worked well but since I'm at home 24/7 these days the project fell off my priority list. Maybe this will inspire me to finish it.