Hi gwand and welcome to TFF, one of the friendlier fish forums on the net.
The fish you acquire will play a role in the appropriate way to feed them while you go on vacation. For example, if you get a Badis Badis fish that prefers live foods only, you may end up having someone come and give the fish a little food every other day or so. If the fish you acquire is a wild caught fish that won’t eat pellets and flakes, that could be another problem. If your fish will readily eat flakes and pellets, then you can certainly use an automated feeder.
Healthy fish can go without food for a day or two, so to go away for a long weekend, you may not have to do anything special for them, especially once your aquarium matures. This is especially true of omnivorous fishes.
Years ago I was working a lot and was also in the process of moving house, so I would only travel back to my old empty house once a week where my aquarium was still located. Every time I visited the old house I would drop in a Tetra Vacation Tropical Slow Release Feeder in my lightly stocked tank. My fish lived on that stuff for nearly a year (!) so I can attest that it can do the job, although over such a long period of time it was not the ideal situation for my fish, but they did all pull through fine. Eventually I got tired of maintaining a separate house an hour away for my fish and finally went through the “pain” of moving the aquarium and selling the old house.
), you can pre-measure it into little cups to avoid over-feeding. 
