Everbody knows this kind of problem: you want to drink a cup of coffee and the water tank is empty!
Here is the soultion: we took some Arduino Nano boards to read in the values from the sensors and switching our relay. For more details, please refer to the code and the schematic.
I set the level to advanced because of two reasons:
1.) I opened the coffe machine to get acess to the sensor, which reads out if the tank is empty.
2.) We had to do a lot of mechanical stuff and to work with water isn't easy since you don't want any of it to leak out.
Here you can find some pictures an da video of how it looks like and how it works:
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