Today I took the proto to Main Street. We have a park that is surrounded by an old (Victorian?) cast iron fence seated in a straight curb that runs next to the sidewalk. A perfect spot to test Proto's ability to follow a wall.

It did very well. In that environment I could run and keep up

So, feeling confident, I took it to a store front that had inset entrance doors. It could follow the in going wall below the plate glass then turn left when it got to the doors themselves.

WRONG! It did not turn at all. It crashed straight into the right hand glass door.

Then it stopped working correctly. It behaved very strangely. NUTS.

Seven hours later I realized the impact had moved the forward looking proximity sensor. It was now reacting to that thing-a-ma-gig to which the 'C' clip is attached for holding on the plastic car body.

I had not calibrated the numeric proximity sensor responses relative to the speed of the car. I have now more than doubled the "WATCHOUT" threshold for the front facing sensor.

Technical question. How many nested subroutines brings down the code. Any idea?

Ken