I am building a reaction course for airsoft.
The initial problems are solved and I am now standing with a working prototype using Adafruits Arduino Motor Shield.
The problem with this it uses alot of I/O on the arduino and it is a quite expensive solution.
I need a simple schematic for a stepper driver which is controllable with as few signals as possible from the arduino. Hopefully one or two I/O's. I'm thinking something triggered by a relay apparatus.
I've searched around and couldn't find anything on the subject.