Pass Through Topology

With this robot, we used a simple pass through topology.
It's an instance of Braitenberg's first type of robot.
Input is prepresented by three sets of neurons, one for each of the IR sensors.
The more the sensor is activated, the more neurons that fire.
Similarly, there are two sets of motor neurons. The more of these that fire, the faster the appropriate motor goes.
If the left motor is going faster than the right, then the robot turns right, and vice versa.
We don't go in reverse.