This sensor is intended to be used in one of my other projects. Spinbot-2 is now all wired up and ready to accept ping#. All the inputs and outputs have been tested. During the debugging I found that 2 of the 7 HC-SR04 had bad 10k resitors that failed open circuit. 

A quick test of all the sensors by logic and all the inputs resulted in a loss of range.  I'm suspecting that not all the transudcers and receivers are installed with the same phase. So that will be the next step.