looking for a DIY Temperature sensor with audible alarm

Justfbilly

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I built a DIY Temperature sensor with the ITC 1000, the build I followed can be found here:

http://spec-tanks.com/how-to-make-an-aquarium-temperature-controller/


Now I am on the look out for a DIY build for a Temperature controller that can be set up as an audible alarm that will sound if the temperature in the tank gets too low or too high? Has anyone made something like this or has an idea on what would work?

Thanks
 

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