Hi there,
I'd like to build a table tennis robot. Therefore I need to run three dc motors (12V) and a stepper motor. Currently I'm using an arduino Uno, is this enough? Can someone tell me what motor drivers/ shields I should use?
The shields I looked up so far only drive for example 4 dc motors, but than I've no connection slots for the stepper motor left...
You may be tempted to use the ever popular and cheap L293 or L298 motor drivers. Resist. Those are ancient and very inefficient units that, compared to modern drivers, are very poor.
+1 for Pololu. They have a good line of drivers at reasonable prices. They have good instructional pages for each of their products.