Hello,im doing a home project. I have an idea to make a venchile which will move back and forward as well as turn. Its something that i will be able to control with control device,if i press forward it goes forward etc. The thing is that i want to make it with linear actuators,cylinders(compressed air as power source). I havent been succesfull with transforming linear motion to rotary so that my wheels can move clockwise(CW) and counter clockwise(CCW),i only mannaged to make it rotate in one way when i give input signal. I need a mechanism to switch beetween cw and ccw motion depending on signal given by device i hold in my hands. If u have any ideas how the mechanism should look like post here drawing or something to help this project become alive. Thanks!