Howdy all, new to arduino here and wanted to run a project past you. I am a pretty active home brewer. One of the important parts of home brewing is making yeast happy so that they make my beer alcoholic. The best way to make yeast happier before dropping them in a high gravity (lots of sugar) wort (beer before it is alcoholic) is to give them lots of friends to help out with the work. Ideally you take the yeast and stick it in a lightly sugared solution and mix it for a day while it makes more yeast. The best ways to mix yeast is to use a stir plate, the catch is that stir plates run about $90-$120 usd, which makes it a little out of the reach of most beginner/intermediate home brewers.
Here is where the Digispark comes in. From my understanding it has at least 2 PWM outputs and 2 analog inputs and the VIN pin can take 7-35v. I would like to use 1 analog input to control one of the PWM outputs. I figure I can use the circuit and coding found here (
http://itp.nyu.edu/physcomp/Tutorials/HighCurrentLoads) with some slight modifications to control a 12v computer fan that has magnets glued to it. Mount it all in a box, power it with a 12v 1000ma wall wort and I have a stir plate. The best part is that based on my research I can get all the parts for under $40-$50 (including the digispark!). A second stir plate could be added to the same box by using the second analog input and pwm output with very little additional cost.
I am hoping that by removing complicated PWM circuitry and using a low cost device like the Digispark, this stir plate would be cheap and easy enough for not so technical home brewers to build.
Do you think this would work or is there something I am missing?
