Two motor walkers can't realy turn efficiently. I may refit my walker to do it or do another 2 motor walker. I do plan on another 2 motor walker using off the shelf parts. The instructions will be found on the main robotics page. My 2 motor walker uses a nervous network.
Nervous networks are very similar to Neural networks, however there are important diferences.
Nervous networks, in the most basic sense, imitate neurons that are responsible for reflexes. Each neuron is a single inverter. The inverter MUST have a schmitt trigger. A schmitt trigger allows a signal to fluctuate a little bit without rapid triggering of the output. There are two thresholds, a high and a low.