It may have been that the reused yeast was giving a more vigorous ferment, and not having a fridge at the time might have been too much.
This also happened to be the cleanest and driest brewday ever (still some washing up left tomorrow, but no sticky messes). Let's hope the ferment goes well too.
To help understand what is happening during different stages of the brew process, I've got most the parts to assemble a raspberry pi temperature logger. It's staggering the power in a raspberry pi is available for less than £25.
