His device uses a current sensor to monitor power usage of the coffee pot, and after some observation, he was able to pick out its brewing pattern—7A at 10 minutes, then quick cycling to keep the pot warm.
The system features an Arduino Yún for brew tracking and sends an alert via his office communication tool to let everyone know that a fresh pot is ready. As with many projects, the first iteration started life on a breadboard, but now exists on a manufactured PCB as a shield. It even has a second channel that is slated for use with the office kettle.
Once the Arduino side of the Yún detects the brew cycle is complete, it triggers a shell script under Linux that sends a notification to our office communication tool Hipchat. It also records the data about date and cycle stage so that Hipchat can query the database (on a webserver) and request things like what stage the brew cycle is on and when it brewed last.
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