For our project, we had to route a wire through some twist ties, then secure the wire by twisting them.  We accomplished this by putting a motor on one side of the brick and attaching a beam with holes in it to the motor.  This way, the twist ties could go into the holes, and be twisted when the motor spins.  Then, we attached a touch sensor to the other side of the brick to control the motor. We also attached a spool-like fixtrure to the back of the brick to hold the wire in place.

One challenge that we faced was getting the touch sensor to be in a good place for both left-handed and right-handed use.  Originally, we were going to position the sensor so the thumb would press the sensor, but then we realized that this would not be good for both hands since the thumbs are opposites.  We instead decided to place the sensor so the index finger could press the button.  This also allows the user to better stabilize the tool while holding it since they can use their thumb to grasp it.  This is especially important since the user is wearing bulky gloves.  We also faced the challenge of the wire getting in the way of the motor.  We solved this by putting the spool like fixture in the back to keep the excess wire out of the way.

Since the program was relatively simple for this project, we programmed on the brick.  We made it so that when the touch sensor was bumped, the motor turned on.  When it was bumped again, the motor would turn off.  Then, we put the whole program in a loop (picture attached).