Brewdoo Helps Keep The Office Coffee Fresh

Until about lunch time, the coffee goes pretty fast in our office. Only a few of us drink it well into the afternoon, though, and it’s anyone’s guess how long the coffee’s been sitting around when we need a 4:00 pick-me-up. It would be great to install a coffee timer like [Paul]’s Brewdoo to keep track of these things.

The Brewdoo’s clean and simple design makes it easy for anyone in the office to use. [Paul]’s office has two carafes, so there’s a button, an RGB LED, and a line on the LCD for each. Once a pot is brewed, push the corresponding button and the timer is reset. The RGB LED starts at green, but turns yellow and eventually red over the course of an hour. Brewdoo has a failsafe in place, too: if a timer hasn’t been reset for four hours, its LED turns off and the LCD shows a question mark.

[Paul] knew he couldn’t touch the existing system since his company leases the equipment, so the Brewdoo lives in an enclosure that [Paul] CNC’d with custom g-code and affixed to the brewing machine with hard drive magnets. Although [Paul] designed it with an Arduino Uno for easy testing and code modification, the Brewdoo has a custom PCB with a ‘328P. The code, Fritzing diagram and Eagle files are up at [Paul]’s GitHub.

9 thoughts on “Brewdoo Helps Keep The Office Coffee Fresh

  1. Let me guess, they just throw the old coffee away?

    Old coffee is fine once you’ve stirred it a bit. The only unsavoury part is the muddier stuff at the bottom, though some people don’t care.

  2. Well done! This is exactly the sort of thing for which I designed LCDuino. You could reduce this to an LCDuino, the LCDuino button board (you’d push the button up or down for pot 1 or 2) or two pushbuttons, and two bi-color LEDs.

    There are a lot of relatively simple projects like this that I’ve done where the design starts with the equivalent of an Arduino UNO and the AdaFruit RGB backlit LCD shield, and you add just a little bit of external hardware. One of my favorites was a simple GPS clock – It’s just LCDuino and a GPS receiver module.

    https://www.tindie.com/products/nsayer/lcduino/

  3. It’s a nice piece of hardware, but at least in my office, no one would ever remember to press the buttons.

    It’d be interesting to try a timer triggered by the power draw of a brew cycle — or possibly a scale under each pot to determine when it’s freshly filled.

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