On Thu, 2008-12-25 at 07:32 +1000, cdb wrote:
> I have been asked to alter one of my temperature controller projects 
> to work as an egg incubator. I need to implement a better heater 
> control mechanism.

I just repaired an egg incubator that has been in use producing chicks
and parrots for years. 
No pid controller, just a 555 timer and a triac.
M.

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