When I get home, it is always a great time to have a cup of drink until you open the fridge and all the drinks are out of stock. I have run into this situation hundreds of time. Even if I bear in mind that I have to buy drinks, sometimes I still forgot as I didn't get a notification before I got home.
This experience inspired me to start this IoT project.
There are two precedent projects I found that is related.
1. "Raspberry Pi Beer Fridge of Awesomeness":
http://www.instructables.com/id/Raspberry-Pi-Beer-Fridge-of-Awesomeness/
That detect the stock and the overall condition of the beer.
2."Fridge Food Detector"
http://www.instructables.com/id/Fridge-Food-Detector/
It uses the force detector to monitor the volume of the milk, which is a more direct way to tell the user how much milk is left in the fridge.
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