[Noisebridge-discuss] Termperature sensor datalogger

[Glen Jarvis]

I am doing a diy bio experiment on survival rate of e. Coli after  
freezing (with different cryo agents). I'd like to make a quick  
arduino data logger.

I need to measure temperatures around -20 degrees C (about -4 degrees  
F.)

I did something like this with my Lego mindstoms sometime back - but  
it was for a very short amount of time.

I need to take regular measurements (like once every 15 min) for a  
month.

Does anyone know a good vendor for a temperature sensor in this range?  
What are the issues I may encounter operating a battery in sub zero  
freezing temperatures on an ongoing basis? I don't mind changing out  
batteries or retrieving device for data retrieval once per day.


Glen