I'm a computer scientist and roboticist (rather on the software side) and new to the Arduino World. In my current project I want to slowly (10rpm) rotate a large disc (D=2.5m) and our engineer says we need a torque of about 2Nm. Since I use a Leonardo to interface with two sensors, I thought about using a motor shield to talk to the motor so that I could also run a control loop on the arduino. My current plan is to use a DC motor, although I'm not sure if a step motor would be a better choice, so please tell me what you would use.
To be more specific, I want to control this motor: http://www.conrad.com/ce/en/product/198486/DOGA-DO31627612H003120-12V-DC-Motor-38RPM-2NM with this shield: http://arduino.cc/en/Main/ArduinoMotorShieldR3
My problem is this: "Max current 2A per channel or 4A max (with external power supply)"
Can I connect both outputs to the DC motor? I found some threads to this topic but only found the answer "Could be possible, depends on shield and motor" so I hope to get a definite answer. Or should I just use a step motor?