Guinness is one of those beers (specifically, a stout) that people take seriously and the Guinness brand has taken full advantage of that in their marketing. They even sell a glass designed specifically for enjoying their flagship creation, which has led to a trend that the company surely appreciates: “splitting the G.” But that’s difficult for many to pull off, so Eamon Magd built this device that makes the trick easy to master.
“Splitting the G” refers to taking the initial gulp of stout in precisely the right amount to leave the line between liquid and foam in the middle of the “G” on the Guinness logo on a standard Guinness pint glass. Not too difficult for frequent imbibers, but Magd doesn’t usually drink and hasn’t had the practice.
This device solves that problem by vibrating when Magd sips just enough Guinness to result in a split G. It does that with an Arduino UNO Rev3 that monitors the stout in the glass with a non-contact liquid level sensor.
Traditional liquid level sensors, like floats, require physical contact with the contents of the vessel, which can be unsanitary. The sensor chosen by Magd doesn’t, as it relies on capacitive measurements. It attaches to the outside of the glass and can tell if liquid inside the glass is above or below its level.
Magd just had to find the right spot on the glass to attach that sensor and then programmed an Arduino sketch to run the vibration motor when the sensor fails to detect liquid. Magd even plans to put that to the test at the Guinness Storehouse in Ireland.
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