[Coco] Artificial Intelligent (AI) Opponent

[John Mark Mobley]

David,

My first work with PID was controlling a fire nozzle tester.  I could
control a valve to a position (0 to 90 degrees) that controlled the flow
from (0 to 500 GPM).

Then I worked on a garage door opener.

Then I worked on a turntable rpm speed control for a coin sorter.

-John Mark Mobley

On Jan 2, 2018 3:33 AM, "Dave Philipsen" <dave at davebiz.com> wrote:


On Jan 1, 2018, at 9:45 PM, Allen Huffman <alsplace at pobox.com> wrote:

>> On Jan 1, 2018, at 8:49 PM, Dave Philipsen <dave at davebiz.com> wrote:
>>
>> Hey, I noticed you referenced a PID controller.  What was it used for?
I wrote a PID control about 27 years ago for a 6502 board that ended up
controlling hydraulic cylinders in the animatronics characters in the ET
dark ride at Universal Studios Florida.
>
> Very cool, Dave. I got to see your work a number of times, then! Who did
you do the work for?

At that time I was contracted by Triad Productions out of Des Moines, IA.
The animatronics characters were designed by a company called Creative
Presentations.  All of the analog movements were controlled by hydraulic
cylinders with linear feedback potentiometers.  The controller received
position information from the show control computer and used a PID loop
applied to the feedback from the pots to more accurately control the
movements.

>
> 6502 assembly, I assume?

Yes.  As I recall, a typical 4 MHz 65C02 (Rockwell) ran PID logic for up to
32 analog hydraulic valves.

>
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