Auto frozen food feeder

Discussion in 'Do It Yourself (DIY)' started by ReeferAl, Oct 12, 2017.

  1. ReeferAl

    ReeferAl Well-Known Member

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    This is the DIY feeder I've been using for about 10 years. It is designed to feed small amounts of (thawed) frozen food about every 60-90 minutes throughout the day. It has several components:
    1. Mini fridge to keep food chilled as cool as possible.
    2. Container to hold the food, suspended in water.
    3. Stirring motor to turn a propeller before each feeding to suspend the food throughout the container.
    4. Peristaltic dosing pump to send the food from the container to the tank. This also prevents any back-flow into the container. 4a. Flow loop from sump to feeder and back to sump.
    5. Board to control the feed cycle.
    6. Timer to initiate the feed cycle. I do this with the Apex.
    FEEDER.jpg
     
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  2. ReeferAl

    ReeferAl Well-Known Member

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    Here are some photos of the working feeder.

    controller.jpg doser.jpg food jar.jpg
     
  3. ReeferAl

    ReeferAl Well-Known Member

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    The controller board is a relay designed for home security systems but I'm sure other boards could also be used. It allows the feeding cycle to be initiated with a low voltage trigger signal and allows the dosing pump ON-time to be adjusted down to about 1 sec. The pump I use spins pretty fast so about 1 sec per feed is plenty. Only a small amount of liquid is added with each feeding so it really doesn't affect salinity. The jar is 1 gallon and is dosed over about 6-7 days. Here's the board I've used very successfully. It is model 6030:

    6030.jpg
     
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  4. MaddyP

    MaddyP 'Til Reefdom Come... R2R Supporter SCMAS Member Build Thread Contributor Partner Member 2018

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    I’ve been searching for an appropriate mini fridge to accomplish this on a smaller scale. It seems technology hasn’t yet miniaturized refridgeration to the proper level.

    Love the project, great job!
     
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  5. Larry L

    Larry L Well-Known Member Partner Member 2018

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    Nice setup. Now you just need a hopper to automatically drop food cubes from the freezer section into the food jar!
     
  6. ReeferAl

    ReeferAl Well-Known Member

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    I've tried that but so far haven't gotten the bugs out so I shelved the idea. Figured I'd stick with my tried and true method.
    A while back I bought an auger assembly taken out of a commercial ice dispenser. What I would really like to do with it is have it turning very slowly but continuously all day. I can't find any motor capable of doing that though. They're either too fast or have insufficient torque. Some day I'll give it another go with the new auger assembly. I'd like to have it drop cubes or chopped food directly into the sump
    One problem I've found with small fridges or freezers is that they use the outer metal shell itself as the outside heat ex-changer. That makes it very hard to make any holes in the sides or top because you never know where the refrigerant tubing will be running. The back seems to be safe though.

    Allen
     
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  7. ReeferAl

    ReeferAl Well-Known Member

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    I would also caution anyone against using thermoelectric chillers. I tried and they can't keep the fridge cold enough and just don't last.
     
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  8. sbash

    sbash Well-Known Member R2R Supporter Build Thread Contributor

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    Great idea, I never thought to use a dosing pump! Do you blend your frozen food? Some of the stuff I get would run the risk of clogging the pump...

    What about this? https://www.amazon.com/Gourmia-GMF600-Portable-Fridge-Cooler/dp/B00DQT2ZGE
     
  9. MaddyP

    MaddyP 'Til Reefdom Come... R2R Supporter SCMAS Member Build Thread Contributor Partner Member 2018

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  10. sbash

    sbash Well-Known Member R2R Supporter Build Thread Contributor

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    Interesting...

    Makes sense! Even in my proper fridge, at 4-5 days, the smell starts to get a bit funky...

    I wonder if these smaller fridges can be modified... Fridge/freezer tech is pretty simple....
     
  11. MaddyP

    MaddyP 'Til Reefdom Come... R2R Supporter SCMAS Member Build Thread Contributor Partner Member 2018

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    Hmm...you pose an interesting prospect! I’ll do some research on this tomorrow. ;)
     
  12. ReeferAl

    ReeferAl Well-Known Member

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    I do not chop up or blend the food in any way but I do use tubing with 3/8" ID so pretty big stuff goes through it without difficulty. With smaller tubing you would either have to chop the food or use only smaller food. Copepods, daphnia and even brine shrimp could go through fairly small tubing but I wanted to include Mysis and small krill (pacifica sp.) so I needed larger tubing. Not sure if 1/4" ID would be big enough. That's certainly and easier size doser to find than 3/8".
    As far as food going bad, I haven't seen any problems with food up to a week old, but then fish also make it a habit of eating things like the poop of other fish so I don't think they're as particular as humans. If that worries you, you could always do a new mix in 3 to 4 days instead of 7.

    Allen
     

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