Very old post but here is an Arduino based solution that has 2 temp probes that integrate with ST. This project used the now unavailable ThingShield but a Wi-Fi based Arduino using ST_Anything would work these days.
Having lost a lot of food and beverages when my previous garage refrigerator failed, I have been a little paranoid about it happening again. For the past few years I have been using a temperature monitor that integrates with a La Crosse weather station I bought. But this solution has been very limited and is mostly false positives and has an annual fee. I get alerted via email when my children go raiding the freezer for ice cream as an example.
I recently bought an Arduino and decided to tackle something to alert me based on my criteria instead. Thus the Fridge Monitor was developed. I would assume others in the Community live in areas with warm summers or have young children so I thought I would share this project.
Parts you will need:
Arduino Uno R3 - http://www.amazon.com/dp/B0…