This automated cocktail maker is my biggest (in terms of size) build yet – the machine is built around a small fridge, and uses air pressure to force the drink into the nozzles in the serving hatch.
In order to make sure that the measures are being accurately poured, I use an HX711 scale/load sensor in the loading tray area. This also detects when the glass has been inserted and removed. Beware, these are not I2C compliant…as I spent several hours trying to figure out. They need their own bus!
The motors for the project can be found by searching for “mini air pump motor” – the relay board is based on the MCP23008 and is controlled through I2C…you can also find these online fairly easily.