Physical Constraints

The only real physical constraint for the JumpMotor is that it needs to plug into the expansion headers on the LaunchPad board, so that is where I will start with the schematic and eventually the layout as well.

LaunchPad Expansion Headers

These are the usual 0.10" headers, 2x10 x2. This is a simple component to create from scratch:

1. Component > Add New to Library
2. Set the component properties:
   
3. Assign the pins:
   

   Now I need to make my first big design decision! Do I want the JumpMotor board to have its components "face out" or "face in", and do I want the JumpMotor to be on the top or bottom?

    

   • "Face out" and bottom: the components will be easier to test but board might be awkward to use.
   • "Face out" and top: Components will be easy to test, the motor connector will be easy to use, but the JumpBoard buttons will be inaccessible.
   • "Face in" and top: No advantage to this!
   • "Face in" and bottom: Normal orientation, but the components will be inaccessible and the motor connector will need to be either out the bottom or right-angle out the side.

Since this is an experimental board, ease of access wins. The JumpMotor board will be face out on the bottom. This means the header pins on JumpMotor board will be male with the long ends protruding from the bottom of the board, plugging into the female headers on the bottom of the LaunchPad board. The pins need to be oriented with the bottom of the LaunchPad. Looking down on the top layer of the JumpMotor, the upper left pin will be GND and the lower right pin will be P4.1.

So I assign the pins, working counter-clockwise from the upper left corner; starting with GND and ending with P2.5. Note that I changed the "Part" name to "LEFT".
UPDATE: I should have created left and right parts by clicking "Component > Add New Part" before assigning the pins. There is no way to copy a component into a part, so I had to delete the components and start over.