I am planning to build a series of Arduino-controlled temperature-reporting units for a room full of "Ultracold" -80°C freezers. (I ultimately want to convert the signal to a serial stream that will interface with my existing system.)
So far I have only found one-wire and other sensors that are only rated to -55C. In my application they would spend most of their time around -80C. I only need about 0.5 to 1 degree accuracy at those temperatures.
Does anyone know a source for a low-temperature sensor that would be arduino-compatible, reliable, and be able to be placed at the end of a wire (to be passed into the freezer through a small port)?
Small update below.
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