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Our Biomaker Challenge: Improving homebrewing with the help of arduinos and XOD

last modified Jan 30, 2019 04:52 PM
We are a small, merry band of newbie Biomakers and amateur homebrewers and have started a project to monitor the progression of our fine brews in real time. By day we are two research scientists and a Biology teacher. We are looking to develop a piece of kit which allows us to see how quickly our homebrew is turned from a mixture of sugars in the initial malty extract into alcohol in beer. As sugars are converted to alcohol by the yeast, the density, or Specific Gravity (SG), of the liquid decreases and this is traditionally monitored by the means of a hydrometer. The SG decreases over time until it reaches a final plateau, at which point all of the sugars have been turned into alcohol. We are interested in monitoring how quickly this happens and how we can monitor it in real time.

Sam Mugford, Duncan Gaskin, Larry Percival-Alwyn, Ben Dewhurst


 “What an exciting package to find on my desk first day back in the lab in 2019!” Sam's kit arrives in Norwich



As two of us have absolutely no prior knowledge of using Arduinos the first challenge has been to work out which end of the lead plugs into the laptop and which end into the Arduino. One of us has much more experience of programming, but not huge experience with Arduinos. It’s pretty much a ragtag skillset, held together with a Whatsapp group, copious mugs of tea, soup, swearing and an overarching dedication to the cause of better homebrew.




An alcohol meter, testing beer immediately after brewing but before fermentation.

Image by Jeena on Wikipedia, shared under CC BY-SA 3.0



The learning curve of getting the Arduinos, laptops and components to talk to each other was incredibly steep. A few pointers from the ever-helpful Colette Matthewman helped immensely. Gratifyingly learning the XOD aspect of the project has been pretty straightforward. The online tutorials have stepped us through what we need to do in a logical manner.

Our initial design has been modified, from just monitoring the height via the height sensor supplied, to attaching a Hall Sensor to the Arduino and attaching magnets to the hydrometer. We have developed ideas which can spring from this once we’ve got the basics in place and are quite excited (an overused word), about the potential scope of what we’re playing with.

 We are still very much in the early stages of the project, but are learning and have welcomed the opportunities to work towards a common goal (better beer), whilst acquiring new skills. This project has some way to run and will, no doubt, be adapted, modified and changed over time.


Follow our progress (intermittently) via twitter @dewhurst_ben, @popupcamptrout, @LP_Alwyn, @AutoBrewControl

More information about the Biomaker Challenge can be found at 


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