[Noisebridge-discuss] used electronic utensils turned in to hitech food culturing devices

[Glen Jarvis]

One can also find styrofoam egg incubators for a pretty low price. They work for keeping a solid temperature too.

Glen

El Jun 24, 2010, a las 4:45 AM, "Meredith L. Patterson" <mlp at thesmartpolitenerd.com> escribió:

> On Wed, Jun 23, 2010 at 1:30 PM, Frantisek Apfelbeck 
> <algoldor at yahoo.com> wrote:
>> I've quite pretty good idea what will be
>>    handy and how it should look like but how to refurnish for example old
>>    refrigerator to a fully automated on-line incubator is a bit mystery
>>    to me which I would love to help to resolve. The key words in
>>    this project are: refurnished, robust, efficient and low cost
>>    (talking about hundreds of dollars max for prototypes).
> 
> I wouldn't call it particularly automated, but here's a thing I did in 
> my home lab for L. acidophilus culturing. The Sharper Image makes 
> travel-size refrigerators which also can keep food warm via a heating 
> element -- it's an insulated box with a Peltier device, run current 
> through one way and it cools down, run current through the other way and 
> heats up. I never put in a real temperature control, but since lactic 
> acid bacteria tend to be happy between about 39 and 41 C, I used a cheap 
> probe thermometer ($6, IKEA) with an alarm that went off when the 
> refrigerator got up to temperature and a lighting timer to turn the 
> fridge on and off as needed (a cycle of 15 minutes on, 30 minutes off 
> worked well).
> 
> Next time I find a discarded dorm fridge, I plan to rig up an Arduino 
> with a thermistor and a Peltier device in order to do better temperature 
> regulation. I suppose a styrofoam beer cooler would work too.
> 
> Cheers,
> --mlp
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