positioning

Hi All, I want to turn a rudder like mechanism and currently I use DC motor and polarity to turn it left & right. But It has a limitation that it can cannot be positioned in between. Now I want this extra position to be included. So thinking about a servo to achieve three positions ( left - 0...

Hi, I am trying to understand what sensor I would need to use if I have a plate that is mounted around a shaft where the shaft turns independent of the plate. There is one motor that will rotate the shaft in either direction and another motor that will rotate the plate. When the shaft rotates I...