EE0035jr@aol.com wrote:
>
> Roman,
>
> Thanks for the info. A lot of this info you provided I had not thought
> of.
>
> My main problem is two fold. The tank is made of a plastic material
> and sets on my desk. The second problem is that the smallest heater
> (commercially made) is for a 5 gallon glass tank. It states on the
> heater boxes not recommended for use with small plastic tanks or tanks
> less than 5 gallons.
>
> So I am back where I started. I was hoping someone in PIC land had
> done something similar? I envisioned a PIC interfaced with an
> electronic temp sensor, a heating / cooling element, an adjustment
> pot, and a small smart LCD display for indicating the temperature in
> the tank.


Hmm, tiny fishtank! :o) How about getting a glass
test-tube, put the thermistor(s) in it and a 5w
resistor or 2 as the heater element, fill with epoxy
for thermal conduction and bring the wires out the
top. Basically the same as a commercial glass heater
but tiny. Or maybe sit the entire tank on a heating
mat with just the thermistor in the water??
-Roman

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