I do not know of an off-ther-shelf auto-feeder for smaller feeds outside of home aquarium sized units, but they are not meant to be outdoors.

However, I have had good luck using the "Moultrie All-in-One Deer Feeder Timer Kit" part number MFHP12367. It can be mounted to the bottom of a bucket (or whatever) and the outlet hole can be drilled in the bucket to moderate the flow of your sized feed. The feed cone on the unit is ideal for corn, so using a smaller hole than the largest part of the cone would work better for smaller feed. Just to be safe, I would start with a smaller hole than you would think would work and open it up as you tested your feed sizes if it needed to be bigger. I have have used these timer kits for my fish feeding and deer feeding for a few years now and really like them. The only problem I have had is with the plastic buckets when used to feed the deer...the raccons and squirels are not kind to them and I had to use a steel bucket and lid to keep them from chewing holes in them.

The smaller food that you are feeding may be a bit more tricky to govern out of the bucket than drilling a smaller hole. I can see where a smaller cone might have to be used to get closer to the spinning feed slinger thingy so that the feed does not continuously run out of the feeder, but that's all in a afternoon if you have some gorilla glue and a few $1 funnels from the parts store.

They can be purchased anywhere from 25 to 40$ depending on what time of year you purchase. The closer to deer season, the more expensive. Amazon and EBay are where I find the best deals.

Fish on!,
Noel